Article
Chemistry, Physical
Andoni Choya, Beatriz de Rivas, Juan Ramon Gonzalez-Velasco, Jose Ignacio Gutierrez-Ortiz, Ruben Lopez-Fonseca
Summary: The study focuses on supported bimetallic Co-Ni catalysts for methane oxidation, showing that simultaneous incorporation of nickel and cobalt enhances redox properties and increases active lattice oxygen species, leading to improved reaction rates. The most active catalyst exhibited stability during prolonged operation but irreversible deactivation in the presence of water vapor.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Analytical
Chia -Wei Lin, Manjula Natesan, Sarute Ummartyotin, Yu -Hsu Chang
Summary: 3D-flower structured ZnxCu1-xCo2O4 (x = 0, 0.1, 0.2, 0.3, 0.4) supported on nickel foam was successfully synthesized by hydrothermal method. The prepared Zn0.1Cu0.9Co2O4 catalyst shows superior electrochemical performances in oxygen evolution reaction (OER) with larger electrochemically active surface area, higher electrical double layer capacitance, and higher Faradaic efficiency.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Polymer Science
Fowzia S. Alamro, Mahmoud A. Hefnawy, Sherif S. Nafee, Nada S. Al-Kadhi, Rami Adel Pashameah, Hoda A. Ahmed, Shymaa S. Medany
Summary: Wastewater with high urea levels poses a significant risk to human health. The use of the NiCo2O4@chitosan catalyst can transform urea in wastewater into hydrogen, contributing to environmental conservation and sustainable energy production.
Review
Engineering, Environmental
Cangpeng Shan, Yunchong Wang, Jianbo Li, Qian Zhao, Rui Han, Caixia Liu, Qingling Liu
Summary: This article systematically summarizes the recent advances in the application of spinel oxides for VOCs catalytic oxidation. The design strategies, reaction mechanisms, and degradation pathways of different types of VOCs on spinel oxides are detailed. The characteristic requirements of spinel oxides for various VOCs purification are analyzed, and practical applications and future prospects are discussed to guide the rational design of spinel-based catalysts for VOCs purification and deepen the understanding of reaction mechanisms.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Energy & Fuels
Junshuang Zhou, Juncheng Zhou, Yue Xu, Bingchang Yan, Xinyue Yu
Summary: By altering the contribution of oxygen species, the three methane plasma oxidative pathways can be strengthened. The reaction of O(D-1) + CH4 -> OH + CH3 plays a key role in plasma promoted methane conversion, while the ground state of O leads to synthesis gas production through the reaction with CH3 and CH2. This discovery may provide insight into methane plasma oxidation and combustion chemistry.
Article
Materials Science, Multidisciplinary
Jialing Li, Minming Zou, Wenjing Chen, Xiaowu Hu, Jiatao Zhou, Xiongxin Jiang
Summary: In this paper, a La2O3-doped (Ni,Co)3O4 coating containing 15 wt% La2O3 was synthesized on a SUS430 stainless steel via codeposition, followed by thermal conversion of the deposited layer in air at 800 celcius for 1000 h. The surface and cross-sectional microstructure of the samples is analyzed by scanning electron microscope, and X-ray diffraction. The results reveal that a tri-layer oxide structure with Co3O4 outer layer, (Ni,Co,Fe)3O4/(Ni,Co)3O4/(Ni,Co)O middle layer and (Mn,Cr)3O4/Cr2O3 inner layer is developed on the Ni-Co-La2O3 coated steel. The addition of La2O3 inhibits the growth of Cr2O3 at the coating/substrate interface, and a higher electrical conductivity has been achieved for the La2O3-doped coating sample.
Article
Environmental Sciences
Liming Zhao, Yingju Yang, Jing Liu, Junyan Ding
Summary: Formaldehyde (HCHO) is a harmful air pollutant. Cu-Mn spinel-structure catalyst shows good oxidation activity for HCHO removal. Density functional theory (DFT) calculations reveal the atomic-scale oxidation mechanism of HCHO on CuMn2O4 surface. The Mars-van-Krevelen mechanism dominates the HCHO catalytic oxidation, with the second dehydrogenation step identified as rate-limiting.
Article
Chemistry, Physical
Kyle Karinshak, Pak Wing Chen, Ru-Fen Liu, Stephen J. Golden, Michael P. Harold
Summary: This study investigates the impacts of feed modulation and catalyst design parameters on the conversion of methane and NOx. The results show that the dual-layer catalyst outperforms the single-layer catalyst in terms of methane conversion. The enhancement in methane conversion is related to its nonmonotonic dependence on oxygen, and the transient activity spike is associated with the presence of water during the feed transition.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Biotechnology & Applied Microbiology
Lianfu Liang, Qilin Yu, Yang Li, Zhiqiang Zhao, Shengqiang Fan, Yaobin Zhang
Summary: Magnetite has been found to accelerate methane production in anaerobic digestion. In this study, the addition of magnetite significantly improved nitrate removal in an anaerobic membrane biofilm reactor. The presence of magnetite enhanced the expression of genes encoding type IV pilus assembly proteins, suggesting the formation of methanotrophic consortia based on direct interspecies electron transfer. The study highlights the role of magnetite in promoting nitrate-dependent anaerobic oxidation of methane.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2023)
Article
Engineering, Environmental
Fulan Zhong, Zhiyu Li, Yu Luo, Chongqi Chen, Chen Zhou, Li Lin, Guohui Cai, Chaktong Au, Lilong Jiang
Summary: A complex spinel oxide catalyst was prepared to enhance the oxygen reduction reaction in intermediate-temperature solid oxide fuel cells (IT-SOFCs). The introduction of Ni doping optimized the oxidation states of Fe and Co ions, improving small polaron hopping and enhancing electrical conductivity. The electrochemical performance of the NFCO2-based IT-SOFCs outperformed other reported SOFCs with cathodes, achieving a high power density of 1.93 W/cm(2) at 800 degrees C.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Kausik Chanda, Soumen Maiti, Samrat Sarkar, Partha Bairi, Subhasish Thakur, Kausik Sardar, Nripen Besra, Nirmalya Sankar Das, Kalyan Kumar Chattopadhyay
Summary: The complex heterostructure of CuCo2O4 and MnO2 synthesized on flexible carbon fabric demonstrated high specific capacitance and stable rate capability, utilizing the geometrically intricate design. Optimization of the hybrid sample led to the specific capacitance of 1458 F/g at 0.5 A/g with stable rate capability and 93% retention of initial capacitance value after 5000 cycles, highlighting the superior electrochemical performance compared to pristine samples. The flexible symmetric solid-state supercapacitor achieved high gravimetric capacitance of 181.3 F/g and a high energy density of 64.1 Wh/kg, showing the impact of amalgamation of low dimensional nanoform in a geometrically intricate hybrid on device performance maximization.
ACS APPLIED NANO MATERIALS
(2021)
Article
Energy & Fuels
Mingwei Wu, Meng Miao, Wenzhi Li, Xia Zhang, Lulu Zhang, Taimin Zhen, Yan Fu, Jingting Jin, Liang Yuan
Summary: In this study, a unique 1D Pd@CeO2-BDC catalyst with rich oxygen vacancies and uniformly distributed PdO clusters and PdxCe1-xO2-s species on CeO2 surface was fabricated. The intense metal support interaction in the MOF skeleton resulted in the substitution of Ce4+ in CeO2 lattice by Pd atoms, thus significantly affecting the structure and electronic properties of the catalyst. The excellent reactivity of MOF-derived catalysts was attributed to lower energy barriers for methane activation on the reconstructed surfaces, as revealed by experimental and theoretical calculations. This research provides a new approach for the construction of lean methane combustion catalysts.
Article
Chemistry, Physical
Yueshan Xu, Daoxiong Wu, Peilin Deng, Jing Li, Junming Luo, Qi Chen, Wei Huang, Chong Michael Shim, Chunman Jia, Zhongxin Liu, Yijun Shen, Xinlong Tian
Summary: Direct methane oxidation to high value-added C1 chemicals is a promising strategy. This study explores the atomic-level effect of PdAu atoms on the reaction and finds that Pd9Au1 nanowires exhibit the highest yield and selectivity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Chemical
Liang Chen, Zhenghao Wang, Zhifeng Qin, Guoquan Zhang, Hairong Yue, Bin Liang, Dongmei Luo
Summary: The study found that in the selective oxidation roasting process, selectively oxidizing Fe(II) can destroy the spinel structure, allowing vanadium to exist in low valence for easy recovery, with a maximum LVV recovery rate of 97.75%. This research provides theoretical and technical guidance for direct extraction of LVV from vanadium raw materials.
Article
Multidisciplinary Sciences
Daniel Clark, Harald Malerod-Fjeld, Michael Budd, Irene Yuste-Tirados, Dustin Beeaff, Simen Aamodt, Kevin Nguyen, Luca Ansaloni, Thijs Peters, Per K. Vestre, Dimitrios K. Pappas, Maria Valls, Sonia Remiro-Buenamanana, Truls Norby, Tor S. Bjorheim, Jose M. Serra, Christian Kjolseth
Summary: Proton ceramic reactors efficiently extract hydrogen from ammonia, methane, and biogas by combining endothermic reforming reactions with heat from electrochemical gas separation and compression. The successful scale-up to a 36-cell reactor stack demonstrates its potential in efficient hydrogen production, with complete conversion and high recovery rates of methane and ammonia even at high pressures.
Article
Chemistry, Physical
Simona Somacescu, Petre Osiceanu, Jose Maria Calderon Moreno, Daniela C. Culita, Florentina Neatu, Mihaela M. Trandafir, Stefan Neatu, Andrei Kuncser, Gaobr P. Szijjarto, Emilia Talas, Andras Tompos, Irina Borbath, Mihaela Florea
Summary: A direct synthesis route was developed to prepare mesoporous NiWO4 and NiWO4-graphene nanoplatelets (GNP) composite with crystalline framework. The introduced GNP enhanced the growth of NiWO4 nanocrystallites and induced changes in surface chemistry. The Pt/NiWO4-GNP catalyst showed significantly higher activity in oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR) compared to other catalysts. This composite material is considered as a viable electrocatalyst for PEMFCs using a broader type of fuels.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Marius C. Stoian, Cosmin Romanitan, Gabriel Craciun, Daniela C. Culita, Florica Papa, Mihaela Badea, Catalin Negrila, Ionel Popescu, Ioan-Cezar Marcu
Summary: Several Co(x)CeMgAlO mixed oxides were prepared by calcination of LDH precursors at 750 degrees C, with different cobalt contents. The mixed oxide catalysts exhibited the coexistence of Co3O4, periclase-like and ceria phases, distributed homogeneously. The surface composition and redox properties were found to be crucial factors in determining the catalytic activity of the materials.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Physical
Daniela Negoescu, Irina Atkinson, Mihaela Gherendi, Daniela C. Culita, Adriana Baran, Simona Petrescu, Bogdan Trica, Diana Pelinescu, Robertina Ionescu, Veronica Bratan, Viorica Parvulescu
Summary: TiO2-activated carbon composites with mesoporous structure were prepared by sol-gel method. The study found that activated carbon and titanium precursor had a significant effect on the crystalline phase of TiO2. The results also showed that the phosphorus content in titanium and activated carbon had an important influence on the adsorption and photocatalytic degradation of Brilliant Blue FCF dye and antibiotic Ciprofloxacin.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Alexandru-Tudor Toderasc, Irina Atkinson, Daniela Cristina Culita, Paul Emil Mereuta, Florica Papa, Adriana Urda, Ioan-Cezar Marcu
Summary: Several M-MgFe-LDH precursors were prepared via co-precipitation and then calcined at 500 degrees C to yield the corresponding M-MgFeO mixed oxide catalysts, which were tested in the hydrodeoxygenation (HDO) of benzyl alcohol. The Cu-MgFeO mixed oxide gave the best results, therefore we proceeded with the preparation of a Cu(x)-MgFeO series, where x = 2.5-20 at% Cu. The Cu(10)-MgFeO catalyst exhibited the highest conversion and selectivity towards toluene in the HDO reaction of benzyl alcohol.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Biochemistry & Molecular Biology
Crina Anastasescu, Simona Neagu, Silviu Preda, Daniela Culita, Mihaela Stancu, Cristian Banciu, Cornel Munteanu, Veronica Bratan, Jose Maria Calderon-Moreno, Razvan State, Mihai Anastasescu, Madalin Enache, Ioan Balint, Maria Zaharescu
Summary: ZnSe, ZnSe-TiO2, and TiO2 materials were synthesized using hydrothermal and sol-gel methods, and their antibacterial activity against Staphylococcus aureus and Micrococcus lysodeikticus was studied. The samples were characterized using microscopy techniques, UV-visible spectroscopy, and their ability to generate reactive oxygen species under visible light irradiation was investigated. The results showed a correlation between antibacterial activity and ROS photogeneration.
Article
Polymer Science
Gabriela Petcu, Florica Papa, Elena Maria Anghel, Irina Atkinson, Silviu Preda, Simona Somacescu, Daniela C. Culita, Adriana Baran, Elena Madalina Ciobanu, Luiza Maria Jecu, Mariana Constantin, Viorica Parvulescu
Summary: This study reports the synthesis of efficient Ti-Au/zeolite Y photocatalysts using different processing methods and investigates the influence of titania content on the materials' properties. The optimal characteristics of zeolite Y were obtained through aging the synthesis gel under static conditions and mixing the precursors with magnetic stirring. By incorporating titania (5, 10, 20%) and gold (1%) species in zeolite Y support post-synthesis, the photocatalytic performance was enhanced, especially under visible light due to the surface plasmon resonance (SPR) effect of gold interacting with the supported titania.
Article
Mathematics, Interdisciplinary Applications
Gianina Dobrescu, Florica Papa, Daniela Culita, Ioan Balint, Niculae I. Ionescu
Summary: The close link between surface roughness and adsorptive properties in Cerofolini's model can be explained by the choice of adsorption energy, resulting in well-known adsorption isotherms like Dubinin-Radushkevich or Freundlich. This study introduces fractal behavior to describe both energetic and geometric surface heterogeneities, and develops fractal adsorption isotherms. The findings suggest that fractal isotherms can be used to describe adsorption on both porous and flat surfaces, with fractal dimensions related to energetic disorders. The energetic fractal dimensions of some nanoparticle catalysts (Rh/Al2O3, Rh/TiO2, and Rh/WO3) will be computed using this theoretical approach.
FRACTAL AND FRACTIONAL
(2023)
Article
Chemistry, Physical
Teodora Mocanu, Cristian D. Ene, Daniela C. Culita, Catalin Maxim, Cecilia Lete, Nicolae Stanica, Cosmin Romanitan, Gabriela Marinescu, Marius Andruh
Summary: Two compounds, [K(H2O)(CH3OH)Cr III(valen)(CN)2]2 ( 1 ) and PPh4[Cr III(valen)(CN)2]·8.5H2O ( 2 ), were synthesized and structurally characterized. Compound 1 exhibited solid-state transformation upon heating at 130 degrees C, resulting in the elimination of CH3OH and H2O ligands. Exposure of the resulting crystal to humidity led to the formation of compound 3. Compound 2 consists of discrete anionic mononuclear species [Cr III(valen)(CN)2] - and tetraphenylphosphonium counter cations. Thermal and electrochemical investigations were performed on the newly synthesized complexes.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Anna Stepanova, Teddy Tite, Iryna Ivanenko, Monica Enculescu, Cristian Radu, Daniela Cristina Culita, Arpad Mihai Rostas, Aurelian Catalin Galca
Summary: Photocatalysis using TiO2 has shown promising results in degrading harmful pollutants. This study synthesized TiO2 powders via a hydrothermal method and analyzed its morphology and structure using various analysis techniques. The results demonstrated that TiO2 exhibited excellent photocatalytic performance in degrading dyes, with pH affecting the formation of TiO2 phases.
Article
Polymer Science
Ligia Todan, Luminita Predoana, Gabriela Petcu, Silviu Preda, Daniela Cristina Culita, Adriana Baran, Roxana-Doina Trusca, Vasile-Adrian Surdu, Bogdan Stefan Vasile, Adelina-Carmen Ianculescu
Summary: Magnesium oxide (MgO) was synthesized using sol-gel, microwave-assisted sol-gel, and hydrothermal methods to investigate the effects of preparation conditions on the properties of the products. The samples were characterized using various techniques, such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, etc. The results showed that the MW and HT methods produced MgO particles with higher specific surface areas, but the powders had less-defined morphologies and high levels of aggregation. The photocatalytic activities of the MgO samples towards the degradation of methyl orange under UV light were also evaluated.
Article
Chemistry, Inorganic & Nuclear
Dana Gingasu, Ovidiu Oprea, Gabriela Marinescu, Jose Maria Calderon Moreno, Daniela C. Culita, Silviu Preda, Vasile-Adrian Surdu
Summary: In this study, a series of single and mixed Ni-Co aluminates were synthesized using the precursor method. The effects of nickel substitution on the structure, morphology, and optical properties of the obtained oxides were investigated. The results showed that the size of crystallites and the agglomeration degree of particles decreased with increasing nickel content, while the band gap value was not significantly affected by nickel substitution. The fluorescence spectra exhibited similar patterns but different intensities of emission bands for all samples.
Article
Chemistry, Inorganic & Nuclear
Tania Zhivkova, Daniela C. Culita, Abedulkadir Abudalleh, Lora Dyakova, Teodora Mocanu, Augustin M. Madalan, Milena Georgieva, George Miloshev, Anamaria Hanganu, Gabriela Marinescu, Radostina Alexandrova
Summary: In this study, two families of homo- and heterometallic complexes were synthesized and their cytotoxic and genotoxic effects on different types of cells were investigated. The results showed that these compounds could significantly inhibit the growth and proliferation of cells within a certain concentration range, with the complexes containing Au(I) exhibiting higher cytotoxic and genotoxic activity. Some of the complexes also showed more pronounced cytotoxic potential than commercially available antitumor agents.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Maria-Gabriela Alexandru, Adelina-Carmen Ianculescu, Oana Carp, Daniela C. Culita, Silviu Preda, Cristian D. Ene, Bogdan Stefan Vasile, Vasile-Adrian Surdu, Adrian-Ionut Nicoara, Florentina Neatu, Ioana Pintilie, Diana Visinescu
Summary: Two new families of zinc/cobalt/aluminum-based pigments with unique compositions were synthesized through the polyol method. The hydrolysis process of a mixture of Co(CH3COO)(2), Zn(acac)(2), and Al(acac)(3) in 1,4-butanediol resulted in dark blue gels (wPZn(x)Co(1-x)Al) and light green powders (PZnxCo1-xAl) for water-containing and water-free procedures, respectively. Calcination of the precursors produced dark green (wZn(x)Co(1-x)Al) and blue (ZnxCo1-xAl) products. The pigments exhibited bright colors with a moderate degree of luminosity, and high blueness according to CIE L*a*b* and C* colorimetric parameters.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
A. Bouzeggane, P. P. Bargiela, M. Aouine, R. Checa, I. Popescu, I. C. Marcu, O. Peruch, V. Belliere-Baca, J. M. M. Millet
Summary: The study found that the VSbBiBaO/Al2O3 catalyst has the advantage of operating at a low temperature and can be used in combination with propene oxidation catalysts to produce propylene. The role of the constitutive elements, dopant, and support of the catalyst was determined through characterization and testing.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Ming-Yi Chen, Ngoc Thanh Thuy Tran, Ahmed Abubakar Alao, Wen-Dung Hsu
Summary: This study demonstrates the significance of surface Pt atom arrangement for the efficiency of ORR in PEMFCs and reveals the correlation between Pt-Pt average distance and O2 dissociation barrier. Furthermore, the study discovers a robust correlation between the level of the catalyst's d-band center and O2 adsorption energy. High-entropy alloy substrates provide potential for controlling Pt arrangement and O2 dissociation barrier.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Eduardo C. Atayde Jr, Babasaheb M. Matsagar, Yu-Cheng Wang, Kevin C. -W. Wu
Summary: This study presents the first application of an acidic MOF, Sulfated MOF-808, in catalyzing the HAA reactions of furan oligomers for the production of biofuel precursors. The catalyst showed high yield, selectivity, and recyclability, making it versatile for different starting materials.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Maria do Carmo Rangel, Francieli Martins Mayer, Soraia Jesus de Oliveira, Sergio Gustavo Marchetti, Fabricio Luiz Faita, Doris Ruiz, Giovanni Saboia, Mariana Kieling Dagostini, Jonder Morais, Maria do Carmo Martins Alves
Summary: This study developed a new catalyst by investigating the effect of magnesium on the catalytic properties of hematite in ethylbenzene dehydrogenation. The catalyst showed important differences in activity, selectivity, and stability, making it a promising candidate for commercial applications.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yanjun Li, Qian Wang, Hui Tian, Mingyuan Zhu, Yuanyuan Liu
Summary: A novel strategy using microwave-assisted precipitation was proposed to prepare defective CsH3PMo11VO40 catalyst for the oxidation of methacrolein to methacrylic acid. Microwave treatment accelerates crystallization, increases vanadyl species content, and forms defective Keggin structures, thereby enhancing the oxidation capacity of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Rajeshwari Athavale, Sailee Gardi, Fatima Choudhary, Dayanand Patil, Nandkishor Chandan, Paresh More
Summary: In this study, a novel acidic ionic liquid catalyst was prepared and used for the synthesis of bis-indolyl methane derivatives. The catalyst exhibited short reaction times, easy purification, and reusability.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Masatomo Hattori, Takato Hattori, Masakuni Ozawa
Summary: Cu-added gamma-Al2O3 catalysts were prepared with varying Cu loadings and the effects of copper oxidation states on catalytic activity were investigated. The results showed that the addition of copper increased the catalyst activity, but excessive copper loading decreased catalytic activity. XRD and TEM analysis indicated the formation of a solid solution of copper oxide species on the surface of gamma-Al2O3. XAS and TPR data demonstrated variations in copper oxidation states among the catalysts.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liwei Fang, Shiyang Niu, Shengsen Wang, Yiqing Lu, Yuanhui Cheng
Summary: In this study, PtNi alloy on nitrogen-doped carbon and SnO2 dual-support was designed to modulate the metal-support interaction, resulting in improved catalytic activity and stability for oxygen reduction reaction. The SnO2/PtNi/NC catalyst exhibited a strongly coupled interface, enhanced electron transfer, and higher half-wave potential compared to PtNi/NC and commercial Pt/C.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Shohei Harada, Duanxing Li, Kenta Iyoki, Masaru Ogura
Summary: This study investigates the catalytic performance of a composite catalyst composed of ZnZrOX and H-zeolite for the hydrogenation of CO2. The deactivation of the composite catalyst is influenced by ion exchange of Zn2+ and/or coke, with their effects differing based on the zeolite structure. Separating the grains of the composite catalyst can prevent deactivation.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Laura Proano, Christopher W. Jones
Summary: In this study, NiGa alloy particles supported on CeO2, ZrO2, and ZrO2-CeO2 solid solutions were prepared and characterized. The nature of the support was found to have a significant influence on the catalyst's activity and selectivity, with the crystalline structure of ZrO2 having the greatest impact. Pure ZrO2 showed the highest methanol selectivity and CO2 conversion at high Zr:Ce ratios. In equimolar and Ce-rich conditions, basic sites and oxygen vacancies were found to be the key parameters affecting methanol production.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Liyan Zhang, Yinze Yang, Leilei Zhou, Fengyu Zhao, Haiyang Cheng
Summary: 1,6-Hexamethylenediamine was successfully synthesized via the reductive amination of 1,6-hexanediol using a Ru/PRL(x)-Al2O3 catalyst. The highly dispersed and anchored Ru species, formed by 1,10-phenanthroline (PRL), played a crucial role in the catalytic reaction. The formation of new acid-base pairs, electron deficient Ru species, and smaller nanoparticles contributed to the improved catalytic performances of the Ru/PRL-Al2O3 catalyst.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Anita Horvath, Miklos Nemeth, Andrea Beck, Gyorgy Safran, Valeria La Parola, Leonarda Francesca Liotta, Gregor Zerjav, Matevz Roskaric, Albin Pintar
Summary: This study investigates the catalytic and structural changes caused by the addition of 0.25 wt% indium in a 3% Ni/CeO2-Al2O3 catalyst prepared by impregnation method. The results show that the addition of indium can decrease the activity of the catalyst, but it improves its stability and reduces coking.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Ankush Kularkar, Vaibhav Vilas Khedekar, Sachin D. Chaudhari, Mudavath Ravi, Sadhana S. Rayalu, Penumaka Nagababu
Summary: Efficiently addressing the challenges of photocatalytic CO2 reduction to CH3OH is crucial. This study developed Zn-BTC MOF and its composites with CaIn2S4, achieving highly efficient and robust photocatalytic CO2 reduction to CH3OH under ambient conditions, using H2O2 as the hydrogen source. Among the composites, ZMCIS4 demonstrated excellent performance with a CH3OH evolution of 49100 μmol/g.cat and a quantum efficiency of approximately 78.41%. The enhanced performance was attributed to the production of nascent hydrogen atoms (H center dot) through the photo-splitting of H2O2 on the ZMCIS surface.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Dan Liu, Yudong Li, Chengyu Wang, Haiyue Yang, Rong Wang, Shujun Li, Xiaohui Yang
Summary: In this study, a self-supporting three-dimensional porous Co3O4 nanobelt array decorated on nickel foam (P-Co3O4 -NBA@NF) electrode with numerous active sites was successfully constructed for the oxidation of 5-Hydroxymethylfurfural (HMF) to 2,5-furan dicarboxylic acid (FDCA). The P-Co3O4 -NBA@NF electrode demonstrated high conversion efficiency, selectivity, and Faraday efficiency, as well as remarkable long-term stability. This research provides a promising electrocatalyst for biomass conversion.
APPLIED CATALYSIS A-GENERAL
(2024)
Article
Chemistry, Physical
Yimin Li, Enggah Kurniawan, Fumiya Sato, Takayoshi Hara, Yasuhiro Yamada, Satoshi Sato
Summary: In this study, several silica-alumina catalysts modified with Ag were examined for the dehydration of 1,3-butanediol to 1,3-butadiene. Among them, an amorphous silica-alumina catalyst (SAL-3) modified with Ag showed the highest improvement in catalytic activity and stability when operated in H2 flow. The generation of reversible acid sites was found to be the reason behind the enhanced activity and stability of this Ag/SAL-3 catalyst. The effects of various parameters on the catalytic activity of Ag/SAL-3, such as reaction temperature, contact time, Ag content, and carrier gas, were investigated.
APPLIED CATALYSIS A-GENERAL
(2024)