Review
Energy & Fuels
Da Wang, Min Zhong, Jian Xue, Zhong Wang, Xuebing Li, Bo Hou
Summary: In this review, the utilization of various catalysts and supports, including structured catalysts, high thermal conductive carbon and silicon carbide supported cobalt catalysts, and high thermal conductive Al2O3@Al support, for the improvement of heat transfer in fixed-bed reactors during cobalt-based Fischer-Tropsch synthesis (FTS) are summarized. The use of Co/Al2O3@Al catalysts in the reactor bed significantly increases the heavy hydrocarbon selectivity and shows great potential for industrial application. The review also prospects the possible technical issues and their solutions in large-scale industrial applications.
Article
Chemistry, Physical
Omid Akbarzadeh, Solhe F. Alshahateet, Noor Asmawati Mohd Zabidi, Seyedehmaryam Moosavi, Amir Kordijazi, Arman Amani Babadi, Nor Aliya Hamizi, Yasmin Abdul Wahab, Zaira Zaman Chowdhury, Suresh Sagadevan
Summary: In this study, the effect of reaction temperature, syngas space velocity, and catalyst stability on Fischer-Tropsch reaction using Co-Mn/CNT catalysts was investigated. Results showed that optimizing the temperature, space velocity, and H2/CO ratio led to increased CO conversion and C5+ selectivity. Additionally, the 95Co5Mn/CNT catalyst demonstrated better stability over 48 hours of continuous operation compared to other catalyst formulations.
Article
Energy & Fuels
Wenli Lu, Jungang Wang, Zhongyi Ma, Congbiao Chen, Yan Liu, Bo Hou, Debao Li, Baojun Wang
Summary: The role of carbon deposits during Fischer-Tropsch synthesis (FTS) on cobalt catalysts is still debated. This study investigates the effects of pre-deposited composite and single carbon on cobalt catalysts in FTS. Different types of carbon deposits (atomic carbon, polymeric carbon, graphitic carbon) are identified and characterized using TPH, Raman, and XPS. Results show that the presence of pre-deposited carbon significantly affects the catalytic activity, methane selectivity, and stability of the Co-based catalysts in FTS.
Article
Engineering, Chemical
Xingwei Wang, Yanlun Ren, Houli Liu, Lin Lu, Li Zhang
Summary: Compared to rolling FeCrAl monolith catalysts, 3D printing AlSiMg monolith catalysts are more suitable for Fischer-Tropsch synthesis due to their high thermal conductivity and thermally connected nature. The effects of catalyst activity and thermal conductivity on reaction and thermal performance were studied using experiment and simulation. Two catalysts were prepared, ROL-FeCrAl-MC and 3DP-AlSiMg-MC, with the C5+ yield of 3DP-AlSiMg-MC reaching 0.98 g/(gcat•h), 4.44 times that of ROL-FeCrAl-MC. Simulation results showed that catalyst activity should be improved along with thermal conductivity to maintain the balance between reaction heat and heat transfer capacity, with 3DP-AlSiMg-MC having 67% higher catalyst activity than ROL-FeCrAl-MC, which aligns with its high thermal conductivity.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Chemistry, Physical
Tobias F. Kimpel, Jin-Xun Liu, Wei Chen, Robert Pestman, Emiel J. M. Hensen
Summary: Through IR spectroscopy and DFT calculations, it has been discovered that in the Fischer-Tropsch reaction, Mn promotes a silica-supported Co catalyst with a MnO layer covering the Co surface, activating adsorbed CO through reaction with an oxygen vacancy. This results in higher activity, higher CHx coverage, increased C5+ selectivity, and decreased CH4 selectivity. Increasing pressure amplifies the selectivity differences. However, above around 4 bar, the addition of Mn decreases C5+ selectivity, possibly due to its promotion of C-O bond dissociation but not chain growth. Migration of formed monomers for chain growth on the Co surface may be hindered by high CO coverage, especially at high pressure.
JOURNAL OF CATALYSIS
(2023)
Article
Chemistry, Physical
Alexander Herbers, Christoph Kern, Andreas Jess
Summary: Sustainable transportation fuels are necessary for the energy transition. A new method for producing synthetic sulfur free maritime fuel is introduced, using Co-catalyzed Fischer-Tropsch synthesis (FTS) with syngas based on plasma technology containing traces of O-2. Experimental results demonstrate that the catalyst remains active and does not affect the distribution of C2+-hydrocarbons under low temperature FTS conditions with the presence of H-2. O-2 is converted into H2O and CO2 in varying proportions, with a higher CO concentration increasing CO2 selectivity. This research may provide a new CO2 source for carbon-neutral fuels.
Article
Chemistry, Physical
Shupeng Guo, Congcong Niu, Zhongyi Ma, Jungang Wang, Bo Hou, Litao Jia, Debao Li
Summary: Introducing Ba and CN species into Co/Al2O3 catalyst can enhance the electron density on the cobalt surface, which improves the C-5(+) selectivity and C-3 o/p ratio, leading to enhanced catalytic performance in Fischer-Tropsch synthesis reaction.
Article
Materials Science, Ceramics
Ming Hao, Peizhang Gao, Wei Liu, Baizeng Fang, Jinsheng Liang, Tingting Zhang, Youpeng Ding, Hui Zhang, Fei Wang
Summary: A novel Co/CoAl2O4/sepiolite nanocomposite was synthesized in this study, with optimal conditions identified for fabrication. The nanocomposite showed fine cobalt nanoparticles anchored on the surface of CoAl2O4, leading to higher selectivity for high-carbon hydrocarbons in Fischer-Tropsch synthesis. This work provides an effective strategy for low-cost batch fabrication of efficient cobalt-based catalysts.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Byron Bradley Govender, Samuel Ayodele Iwarere, Deresh Ramjugernath
Summary: This study investigated Fischer-Tropsch synthesis using a non-thermal plasma coupled with a mullite-coated catalyst. The results showed that the product yields of gaseous hydrocarbons increased with pressure, decreased with current, and increased with inter-electrode gap. The inter-electrode gap was found to be the most influential parameter on the product concentrations.
Article
Chemistry, Physical
Erling Rytter, Anders Runningen, Edd Blekkan, Magne Hillestad
Summary: The paper presents the development of a mechanism and rate expression for Fischer-Tropsch synthesis over cobalt-based catalysts. The mechanism involves a two-step hydrogen assisted activation of CO and incorporates the influence of water partial pressure on the reaction rate. The resulting kinetic model is tested on various cobalt catalysts and accurately describes the observed CO conversions and selectivities.
MOLECULAR CATALYSIS
(2022)
Article
Energy & Fuels
Lei Li, Yan Liu, Junfeng Zhang, Ming Xia, Weijie Ji
Summary: This study proposes a Metal-Organic Frameworks (MOFs) strategy for the manufacture of highly dispersed supported catalyst, and successfully prepares CoOx/SiO2 catalyst with superior activity and stability. The results show that the high dispersion of Co metal active sites and the increased number of surface-exposed Co sites contribute to the improved catalytic activity. In addition, the sacrificial MOFs strategy can effectively restrain the growth of cobalt particles, achieving the goal of high dispersion.
Article
Chemistry, Physical
Byron Bradley Govender, Samuel Ayodele Iwarere, Deresh Ramjugernath
Summary: The study found that the 6wt% cobalt catalyst showed higher C-1-C-3 hydrocarbon production and relatively lower energy consumption under different reaction conditions. The 6wt% cobalt catalyst performed the best at pressure of 10 MPa for 10s and 2 MPa for 60s, current of 250 mA, and inter-electrode gap of 2 mm.
Article
Energy & Fuels
Dalia Liuzzi, Francisco J. Perez-Alonso, Sergio Rojas
Summary: Ru-Co/Al2O3 and Ru-Fe/Al2O3 catalysts prepared by reduction-deposition method exhibit high activity in Fischer-Tropsch Synthesis, showing different conversion rates and product selectivity. The interaction between Ru and Co in Ru-Co/Al2O3 enhances the activity, while Ru-Fe/Al2O3 displays superior initial performance but declines over time, with less enriched products compared to Ru/Al2O3.
Article
Chemistry, Physical
Apichaya Theampetch, Chaiwat Prapainainar, Sabaithip Tungkamani, Phavanee Narataruksa, Thana Sornchamni, Liney Arnadottir, Goran N. Jovanovic
Summary: A systematic microkinetic model was proposed for cobalt-catalyzed Fischer Tropsch synthesis, accurately predicting product distribution trends and hydrogen utilization. High model accuracy was achieved in material balance, with an error of 10(-10)-10(-3)%.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Lebohang Macheli, Emanuela Carleschi, Bryan P. Doyle, Gerard Leteba, Eric van Steen
Summary: Metal-support interactions in inverse catalysts prepared by adsorbing TEOS on Co3O4 can be manipulated by varying the solvent mixture. Deposition of TEOS on Co3O4 nanoparticles in n-hexane results in the formation of silica oligomers interacting strongly with cobalt(II,III)oxide after calcination at 573 K. Modification of Co3O4 nanoparticles with TEOS in a hydrolysing environment results in a stronger interaction due to the formation of surface cobalt silicate through hydrolysis.
JOURNAL OF CATALYSIS
(2021)
Article
Electrochemistry
Ivan S. Filimonenkov, Sergey A. Urvanov, Nikita V. Kazennov, Aida R. Karaeva, Elena A. Skryleva, Igor G. Solomonik, Natalya I. Batova, Didar Zh. Kurzhumbaev, Galina A. Tsirlina, Vladimir Z. Mordkovich
Summary: The electrochemical recharging behavior of a binder-free flexible carbon nanotube cloth (CNTC) material for aqueous supercapacitor applications was investigated. The surface of the CNTC was oxidized using a KMnO4 treatment in an acidic medium to enhance pseudocapacitance. The effect of the KMnO4 to CNT molar ratio on the capacitance, electrical resistivity, and specific surface area of the CNTC was studied. The functionalized CNTC material showed promising performance as an electrode material for flexible aqueous supercapacitors.
ELECTROCHIMICA ACTA
(2023)
Article
Engineering, Electrical & Electronic
D. Zh. Kurzhumbaev, E. B. Mitberg, D. S. Kalenov, M. P. Parkhomenko, I. S. Eremin, S. A. Urvanov, A. R. Karaeva, V. Z. Mordkovich, S. V. von Gratowski
Summary: Microwave absorption properties of flexible materials based on carbon nanotube (CNT) threads periodic gratings are studied. Resonant absorption is observed in the frequency range of 26.5 to 40 GHz through free space measurements. Materials consisting of CNT thread gratings with different periods, a metal backplate, and an intermediate dielectric layer exhibit significant reflection losses (less than -45 dB). The shifts of peaks on absorption spectra caused by changes in thickness and rotations of the samples indicate the high sensitivity of the obtained results.
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2023)
Article
Chemistry, Organic
V. E. Smirnova, E. Yu. Asalieva, L. V. Sineva, V. Z. Mordkovich
Summary: This paper demonstrates the feasibility of using bifunctional Co/zeolite catalysts for Fischer-Tropsch synthesis (FTS) to produce C-18-C-40 hydrocarbons. These hydrocarbons are intermediate between the high-molecular-weight hydrocarbons produced by conventional FTS using Co/oxide catalysts and the engine fuel components synthesized by FTS over Co/zeolite catalysts. The study findings provide a foundation for the development of a novel technology for producing valuable feedstocks for various oil applications.
PETROLEUM CHEMISTRY
(2023)
Article
Materials Science, Composites
Vladimir Z. Mordkovich, Maxim A. Khaskov, Veronika A. Naumova, Victor V. De, Boris A. Kulnitskiy, Aida R. Karaeva
Summary: Ultralong carbon nanotubes (UCNTs) are purified from iron catalyst particles with the assistance of water vapor. It was found that wet air treatment can significantly decrease the iron catalyst content without significant carbon losses compared to dry air treatment. The residual iron content has a significant influence on the subsequent oxidation of different forms of carbons. The use of water assistance enables the development of environmentally friendly methods for obtaining fillers for nanocomposites of different applications.
JOURNAL OF COMPOSITES SCIENCE
(2023)
Article
Engineering, Chemical
K. O. Gryaznov, L. V. Sineva, E. Yu. Asalieva, V. Z. Mordkovich
Summary: This study compares and analyzes several industrial zeolite-containing cobalt catalysts for Fischer-Tropsch synthesis with various physicochemical parameters. Catalysts with heat-conducting additives, such as aluminum flakes or exfoliated graphite, were tested in an industrial-sized single-tube reactor. The results showed that a catalyst based on support containing exfoliated graphite exhibits higher thermal stability and liquid hydrocarbon productivity, making it more suitable for industrial applications under high gas hour space velocities of the syngas.
CATALYSIS IN INDUSTRY
(2023)
Article
Engineering, Chemical
A. S. Gorshkov, L. V. Sineva, K. O. Gryaznov, E. Yu. Asalieva, V. Z. Mordkovich
Summary: Results from prolonged tests of zeolite-containing cobalt catalysts in reactor tubes of industrial size showed a 13% decrease in catalyst activity after 3000 hours on stream. The main reasons for deactivation were found to be cobalt cluster agglomeration and carbon deposition on the catalyst surface. The study proposed a method to reduce deactivation rate and two methods for catalyst regeneration, with oxidative regeneration treatment recovering 98% of initial activity.
CATALYSIS IN INDUSTRY
(2023)
Correction
Engineering, Chemical
A. S. Gorshkov, L. V. Sineva, K. O. Gryaznov, E. Yu. Asalieva, V. Z. Mordkovich
Summary: An erratum for this paper has been published.
CATALYSIS IN INDUSTRY
(2023)
Article
Chemistry, Multidisciplinary
A. V. Babkin, A. V. Kubarkov, O. A. Drozhzhin, S. A. Urvanov, I. S. Filimonenkov, A. G. Tkachev, V. Z. Mordkovich, V. G. Sergeyev, E. V. Antipov
Summary: The characteristics of lithium iron phosphate cathodes containing different types of carbon nanotubes have been compared. The electrochemical properties of the cathode materials were studied using impedance spectroscopy and charge/discharge measurements. The results indicate that cathode materials containing SWCNTs have the best electrochemical performance at high discharge rates, while DWCNTs-based cathode materials have an advantage during long-term cycling. MWCNT-based electrodes show the highest capacity loss during long-term cycling, while SWCNT- and DWCNT-based electrodes demonstrate satisfactory capacity retention after 50 charge/discharge cycles.
Article
Chemistry, Multidisciplinary
A. I. Mokhova, V. A. Naumova, M. A. Khaskov, A. R. Karaeva, V. Z. Mordkovich
Summary: The behavior of nanomaterials associated with dimensional effects offers the possibility of altering material properties without changing the chemical composition. Carbon nanotubes, in particular, are of special importance. However, the properties of carbon nanotubes are influenced by residual synthesis catalysts and impurities. Therefore, it is necessary to assess the purity and properties of nanotubes and materials based on them. X-ray fluorescence spectroscopy is a convenient and fast method for elemental analysis, but it is important to calibrate the fluorescence spectrometer for each system under investigation.
IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA I KHIMICHESKAYA TEKHNOLOGIYA
(2023)
Article
Chemistry, Multidisciplinary
M. Nasraoui, S. A. Urvanov, I. S. Filimonenkov, V. Z. Mordkovich
Summary: There is a demand for new affordable and inexpensive batteries, such as sodium-ion batteries (NIB), but the technology is still in early development. The main issues are developing high-performance anodes and understanding sodium storage mechanisms. Non-graphitic carbon is commonly used as an anode material in NIBs. In this study, hybrid carbon materials with graphite-containing additives were prepared and investigated as anodes for sodium-ion batteries. The presence of colloidal graphite additives improved cyclability, while the introduction of graphene modified with phenol-formaldehyde groups increased capacity.
IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA I KHIMICHESKAYA TEKHNOLOGIYA
(2023)
Article
Chemistry, Multidisciplinary
V. A. Naumova, V. Z. Mordkovich, M. A. Khaskov, V. V. De, B. A. Kulnitskiy, A. R. Karaeva
Summary: This study investigates the role of water vapor in the purification of carbon nanotubes (CNTs) from iron catalyst particles. The research confirms the importance of water assistance in this process and shows that humidified air treatment can effectively decrease the residual iron catalyst content without significant carbon losses. The residual iron content significantly influences the subsequent oxidation of carbon materials.
IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA I KHIMICHESKAYA TEKHNOLOGIYA
(2023)
Article
Chemistry, Multidisciplinary
E. A. Nikolaeva, I. S. Filimonenkov, S. A. Urvanov, V. Z. Mordkovich
Summary: This study focuses on the development of a flexible carbon electrode based on electrolytic manganese dioxide for enzyme-free glucose oxidation. The study found that electrolytic MnO2 can act as an enzyme-free electrocatalyst for glucose oxidation. The deposition potential of manganese dioxide on a graphite electrode was found to significantly affect its activity. The results showed that manganese dioxide obtained under a low deposition rate has the highest activity, and the electrode based on it demonstrated a wide linear range for glucose detection.
IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA I KHIMICHESKAYA TEKHNOLOGIYA
(2023)
Article
Chemistry, Multidisciplinary
E. Yu. Asalieva, L. V. Sineva, V. Z. Mordkovich
Summary: The influence of particle size and shape of aluminum metal powder as a heat-conducting additive in Fischer-Tropsch synthesis catalyst was studied. The particle size of the aluminum metal powder determines the thermal conductivity and productivity of the composite. The shape of the aluminum particles and the method of preparation affect the porous system and selectivity of the catalyst.
IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA I KHIMICHESKAYA TEKHNOLOGIYA
(2023)
Article
Materials Science, Multidisciplinary
Kirill O. Gryaznov, Dmitry S. Lugvishchuk, Nikita V. Kazennov, Aida R. Karaeva, Edward B. Mitberg, Oleg N. Abramov, Dmitry V. Zhigalov, Natalia Yu. Beilina, Dmitry B. Verbets, Irina Yu. Markova, Anastasia V. Nakhodnova, Vladimir Z. Mordkovich
Summary: Carbon fibers were formed from carbon nanotube-doped petroleum pitch. The study found that the concentration of double-walled carbon nanotubes (DWCNT) had a nonlinear influence on the physical properties of the carbon fibers. Increasing the DWCNT concentration enhanced the thermal conductivity and reduced the electrical resistivity, but also caused inhomogeneities in the material structure and distortions on the fiber surface.
Article
Nanoscience & Nanotechnology
M. I. Griaznova, D. S. Lugvishchuk, K. O. Gryaznov, E. B. Mitberg, A. R. Karaeva, V. Z. Mordkovich
Summary: This paper investigates the influence of carbon components in the composition of graphite paste on the electrical resistivity of a screen-printed carbon electrode. Graphite pastes with different contents of thermally expanded graphite, fine-grained graphite, and carbon black are studied. The research findings suggest that using carbon materials with different physical properties and particle sizes can improve screen-printing quality and reduce resistivity.
NANOBIOTECHNOLOGY REPORTS
(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)