Article
Engineering, Environmental
Junlin Cai, Xinyan Liao, Pingting Li, Qiuxiang Wang, Hongpu Huang, Zixi Lyu, Jing Lin, Shuifen Xie
Summary: By precisely controlling the supply of Pt precursor solution via a micro-syringe pump, penta-twinned Rh@Pt-x core-shell nanobranches with intense surface strains were facilely synthesized, exhibiting superior hydrogen redox electrocatalytic performance.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Hui Zhu, An Guo, Yan Long, Guangyin Fan
Summary: Pt nanoparticles were anchored on a Co3O4-8 carbon matrix through a morphology and surface-electronic-structure reconstruction strategy. The resulting Pt/Co3O4-delta-UC catalyst exhibited ultrahigh activity for hydrolytic AB dehydrogenation with an ultralow Pt loading. The morphology and surface-electronic-structure reconstruction of Pt nanoparticles facilitated the oxidative cleavage of O-H bond in H2O and greatly boosted the hydrogen generation.
Article
Chemistry, Physical
Xinbao Li, Pengfei Shen, Xinyi Han, Yucheng Wang, Yingying Zhu, Zan Wu
Summary: The dehydrogenation mechanisms of liquid organic hydrogen carriers were studied using density functional theory calculations on different metal surfaces, revealing linear relationships between adsorption energies and hydrogen removal. The rate-determining step of cyclohexane dehydrogenation to C6H5* was identified, with reactivity order of Rh(1 1 1) > Pt(1 1 1) > Pd(1 1 1) > Ni(1 1 1).
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
I. Tyrone Ghampson, Hiroki Miura, Junichi Murakami, Kyoko K. Bando, Tetsuya Kodaira, Atsushi Takagaki, Tatsumi Ishihara, Tetsuya Shishido
Summary: This study investigates the activation of methane with nitric oxide on Au-Pt nanoparticles supported on alumina. The reaction produces HCN through C-H bond cleavage, NO dissociation, and C-N coupling reactions. The catalysts with different Au/Pt ratios have similar particle morphology and bulk properties but exhibit differences in electronic and geometric surface properties due to Au surface enrichment. The relative proportion of electron-deficient Pt sites on the catalysts' surface correlates with their activity for CH4 conversion and HCN formation.
Article
Energy & Fuels
N. V. Ruban, V. N. Rogozhnikov, O. A. Stonkus, V. A. Emelyanov, V. P. Pakharukova, D. A. Svintsitskiy, S. V. Zazhigalov, A. N. Zagoruiko, P. V. Snytnikov, V. A. Sobyanin, D. I. Potemkin
Summary: The study focuses on using structured catalysts with metal grids as carriers to transform fossil fuels into hydrogen-rich syngas. Rh-based catalyst performs best at 600 degrees C, achieving up to 70.3% hydrogen content, while Pt-based catalyst shows good performance at 700 degrees C, obtaining -40% H2 content and a H2/CO molar ratio of 5.5. A mathematical model is developed to describe the performance of Pt-based catalyst in methane autothermal reforming (MATR) process.
Article
Chemistry, Physical
Ying Duan, Pan Guo, Dong Sui, Dongsheng Deng, Tianliang Lu, Yanliang Yang
Summary: This article reports a method for preparing a catalyst for the hydrolysis of ammonia borane and characterizes the catalyst. By dispersing noble metals highly on the surface of Cu nanoparticles, the catalytic activity of the catalyst is significantly improved. Among them, the Rh catalyst exhibits the highest catalytic activity and the lowest activation energy.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Dan Zhang, Zuochao Wang, Xueke Wu, Yue Shi, Nanzhu Nie, Huan Zhao, Hongfu Miao, Xilei Chen, Shaoxiang Li, Jianping Lai, Lei Wang
Summary: This study prepared a series of noble metal-doped Ru/CNT catalysts using a microwave reduction method, demonstrating superior performance compared to Pt/C under acidic conditions, with excellent stability and activity.
Article
Physics, Condensed Matter
Dogan Kaya, Hasan Huseyin Isik, Ilknur Baldan Isik, Idris Adanur, Yitao Wang, Mustafa Akyol, Faruk Karadag, Ahmet Ekicibil
Summary: Developing multifunctional nanoparticles for magnetic and catalytic purposes is important, and in this study, Co and low Pt loaded CoPt NPs were synthesized. The magnetic properties of the nanoparticles were found to be influenced by the Pt/Co ratio, with higher coercive field and saturation magnetization observed at lower Pt content. In terms of catalytic activity, 10% Pt loaded CoPt NPs exhibited the highest activity and stability.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Multidisciplinary
Mohamed F. Aly Aboud, Zeid A. ALOthman, Abdulaziz A. Bagabas
Summary: The research focused on improving hydrogen storage performance of activated carbon through methods like ammonia treatment and metal decoration. It was found that metal decoration had different effects on hydrogen storage at different temperatures, potentially overcoming hydrogen spillover at low temperatures but having the opposite effect at room temperature.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Junlin Cai, Xue Zhang, Zixi Lyu, Hongpu Huang, Shupeng Wang, Luhong Fu, Qiuxiang Wang, Xue-Feng Yu, Zhaoxiong Xie, Shuifen Xie
Summary: By utilizing a thermoinduced secondary crystallization process, Pt atoms can be captured into the two-dimensional Rh lattice, achieving precise control over Pt dispersion and enhancing catalytic performance for alkaline hydrogen oxidation reaction. This work sheds light on the design of high-efficiency alkaline HOR catalysts through the ensemble effect of host-guest heteroatom coordinations.
Article
Nanoscience & Nanotechnology
Yu Shao, Hua Chun Zeng
Summary: Different metal nanoparticles supported on ZIF-67 were studied for their hydrogen spillover abilities through analyzing the hydrogenolysis of ZIF-67, providing a method for systematically comparing their performance.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Physical
Danielle Richards, Samuel D. Young, Bryan R. Goldsmith, Nirala Singh
Summary: Chloride poisoning poses a serious challenge for the electrocatalytic reduction of aqueous nitrate, and improved electrocatalysts are needed. RhxSy/C shows higher catalytic activity for nitrate reduction compared to Rh/C and Pt/C, but is still susceptible to chloride interference.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Klara Nagode, Tjasa Kanduc, Tea Zuliani, Branka Bracic Zeleznik, Brigita Jamnik, Polona Vreca
Summary: The isotope and elemental composition of tap water provides a link between infrastructure and environment, helping to understand geological and hydrological conditions and monitor the functioning of the water supply system. Despite limited studies on urban water systems, multiparameter analysis can address this knowledge gap by identifying distinct groups and estimating changes in mixing ratios over time.
Article
Dentistry, Oral Surgery & Medicine
Derya Surmelioglu, Halime Kolsuz Ozcetin, Zeyneb Merve Ozdemir, Sevim Atilan Yavuz, Ugur Aydin
Summary: The study aimed to evaluate the effectiveness of experimental bleaching gels containing 6% hydrogen peroxide (HP), titanium dioxide (TiO2), and/or chitosan compared with 35% HP bleaching gel. Results showed that the combination of 6% HP, chitosan and TiO2 demonstrated promising whitening effects with acceptable mineral alterations.
Article
Chemistry, Physical
Ryo Toyoshima, Takahisa Tanaka, Taro Kato, Ken Uchida, Hiroshi Kondoh
Summary: The mechanism of highly selective detection of H-2 by Pt-Rh thin-film sensors was studied using AP-XPS measurements and electric resistivity measurements. It was found that surface segregated Pt atoms accelerated the dissociation of H-2, leading to a reduction of the sensor surface and a decrease in the film's electric resistivity; on the other hand, a thin oxidized Rh layer blocked the dissociation of the other reducing agent, NH3.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
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)