Article
Chemistry, Physical
Santiago Palencia-Ruiz, Denis Uzio, Christele Legens, Dorothee Laurenti, Pavel Afanasiev
Summary: Nanodispersed MoS2 and CoMoS2 materials with metastable 1T MoS2 phase were prepared using solvothermal technique and studied for their performance in electrocatalytic hydrogen evolution, thiophene hydrodesulfurization, and 1-pentene hydrogenation reactions. The role of different factors in stabilizing the 1T MoS2 phase was investigated, with ethylene glycol found to stabilize the polymorph. The presence of cobalt did not affect the stability of the 1T phase, but improved both HER and HDS performance by forming CoMoS species.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Physical
Daria Ryaboshapka, Laurent Piccolo, Mimoun Aouine, Pascal Bargiela, Valerie Briois, Pavel Afanasiev
Summary: In this study, ultradispersed molybdenum-based catalysts were successfully prepared by sulfidation of thiomolybdates and showed higher HDS activity than conventional MoS2 reference catalysts. Mixing with cobalt further increased the turnover frequencies, exceeding those of benchmark CoMoS catalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Multidisciplinary
Mohamed E. Osman, Vladimir V. Maximov, Tshepo D. Dipheko, Tatiana F. Sheshko, Alexander G. Cherednichenko, Pavel A. Nikulshin, Victor M. Kogan
Summary: In this study, a series of K-modified CoMoS catalysts supported on different commercial activated carbons were prepared and characterized. The catalytic activities and selectivities of these catalysts for higher alcohol synthesis were investigated. The results showed that the choice of activated carbon support influenced the catalytic performance of the catalysts. This study provides valuable insights for the efficient synthesis of higher alcohols.
Article
Chemistry, Physical
Daria Ryaboshapka, Thomas Len, Pascal Bargiela, Mimoun Aouine, Christophe Geantet, Valerie Briois, Laurent Piccolo, Pavel Afanasiev
Summary: This study investigates the ultradispersion characteristics of MoS(x) catalysts on different supports. It is found that the support materials significantly affect the structure and temperature evolution of MoS(x). The sulfidation process involves the formation of oxysulfide and MoS(3)-like intermediates, which then transform into MoS(x) clusters. Compared to MoS2 nanoslabs, the coordination numbers of Mo in ultradispersed clusters decrease and the Mo-S and Mo-Mo distances shorten. Characterizations such as STEM-ADF confirm the prevalence of few-atom clusters and single-atom species in the catalysts. The activity per Mo atom in the thiophene hydrodesulfurization reaction varies with MoS(x) dispersion, with the sequence being Mo/carbons > Mo/TiO2 > Mo/Al2O3 & AP > Mo/SiO2 according to XAS measurements.
Article
Chemistry, Physical
Joseph T. Perryman, Jesus M. Velazquez
Summary: The article emphasizes the potential of multinary chalcogenides for sustainable energy conversion and storage, by predicting and controlling catalytic functionality and synthesizability.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Pavel Afanasiev, Herve Jobic
Summary: The nature and amount of hydrogen species adsorbed on MoS2-based catalysts were studied by inelastic neutron scattering (INS) under various preparation and treatment conditions. The major hydrogen species adsorbed on MoS2 catalysts was found to be similar regardless of preparation or promotion conditions, mainly originating from the vibrations of dangling -SH groups linked to six-coordinated Mo atoms at the M edges of MoS2 slabs.
JOURNAL OF CATALYSIS
(2021)
Article
Energy & Fuels
Emma Aryee, Joseph Essilfie-Dughan, Ajay K. Dalai, John Adjaye
Summary: This study investigated the influence of different support materials on the efficiency of hydrotreating catalyst with Ni-Mo. It was found that NiMo/CNH catalyst exhibited outstanding physicochemical properties, leading to superior hydrodesulfurization activity compared to NiMo/OCPf, NiMo/OCP, and NiMo/CNT catalysts. X-ray absorption spectroscopy analysis revealed that a distorted octahedral Mo coordination environment in carbon-supported catalysts did not always correlate with higher hydrodesulfurization and hydrodenitrogenation activities.
Article
Chemistry, Physical
Daria Ryaboshapka, Pascal Bargiela, Laurent Piccolo, Pavel Afanasiev
Summary: MoS2-C3N4 composite materials were synthesized by one-pot synthesis method, and the solids were characterized by various physical techniques. The results showed that even at the lowest Mo content, the materials contained individual MoS2 and C3N4 phases. The composite materials exhibited excellent thiophene hydrodesulfurization activity and photocatalytic hydrogen evolution activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Engineering, Biomedical
Fangqian Chen, Yue Luo, Xiangmei Liu, Yufeng Zheng, Yong Han, Dapeng Yang, Shuilin Wu
Summary: This review comprehensively summarizes the fabrication processes, structural characteristics, antibacterial performance, and corresponding mechanisms of MoS2-based materials, as well as their representative antibacterial applications. In addition, the outlooks on the remaining challenges that should be addressed in the field of MoS2 are also proposed.
ADVANCED HEALTHCARE MATERIALS
(2022)
Article
Chemistry, Physical
Hector de Paz Carmona, Zdenek Tisler, Eliska Svobodova, Uliana Akhmetzyanova
Summary: This paper investigates the activity and stability of six sulfur-free Al2O3-supported and phosphorus-modified Co-Mo and Ni-Mo carbide catalysts during hydrotreating. The results show that adding 0.5% of phosphorus increases catalyst acidity and reducibility, leading to improved catalyst activity and stability during co-processing.
Article
Chemistry, Multidisciplinary
Roland Weindl, Rachit Khare, Libor Kovarik, Andreas Jentys, Karsten Reuter, Hui Shi, Johannes A. Lercher
Summary: Supercages of FAU-type zeolites provide a robust scaffold for stabilizing molybdenum sulfide clusters, leading to stable catalytic activity for ethene hydrogenation. The Mo4S4 clusters trapped within the FAU structure have a distorted cubane structure similar to the FeMo-cofactor in nitrogenase, and both clusters exhibit identical catalytic activity per sulfide cluster. Additionally, these FAU-encaged clusters show superior stability compared to layered MoS2 structures under the same reaction conditions.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Organic
V. V. Timoshkina, S. Yudintsev, E. D. Frenkel', A. A. Pimerzin
Summary: In this study, mixed PMoV heteropoly acids with Keggin structures and modified sulfide catalysts were synthesized and their performance in hydrodesulfurization (HDS) of dibenzothiophene (DBT) and hydrogenation of naphthalene was evaluated. The results showed that modification of the Mo-containing catalysts with vanadium using a solution of mixed heteropoly acids enhanced their catalytic activity and increased the selectivity for the direct hydrodesulfurization route of the DBT HDS reaction.
PETROLEUM CHEMISTRY
(2022)
Article
Physics, Applied
Gernot Pacholik, Ludwig Enzlberger, Anna Benzer, Raffael Rameshan, Markus Latschka, Christoph Rameshan, Karin Foettinger
Summary: In this study, various Co, Ni, and K modified MoS2-based catalysts were synthesized and compared in their catalytic performance in CO2 hydrogenation, revealing that the addition of K reduced the selectivity to CH4 and affected the temperature at which the maximum methanol formation rate occurred. The materials were characterized using multiple techniques, and different species of Mo and O were observed under reaction conditions.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Maximilian Goeckeler, Cornelius M. Berger, Maximilian Purcel, Ralf Bergstraesser, Arndt-Peter Schinkel, Martin Muhler
Summary: In this study, carbon black was functionalized through gas-phase oxidation using nitric acid vapor at 150 degrees C, and the decomposition mechanisms of oxygen-containing surface groups were analyzed through temperature-programmed desorption (TPD) and temperature-programmed reduction (TPR) experiments. The increase in duration of HNO3 functionalization led to an enrichment of acidic surface groups, with desorbed H2O originating from chemisorbed water bound to carboxylic acid groups and condensation reactions of carboxylic acids and phenols. Additionally, the selective reduction of phenols and carbonyls by H2 during TPR resulted in the appearance of a new CO2 evolution peak at 575 degrees C, indicating the hydrolysis of anhydrides and lactones.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Guohua Yang, Lei Zhao, Guoqing Huang, Zhipeng Liu, Shuyi Yu, Kaiwen Wang, Shisheng Yuan, Qiwei Sun, Xiaotian Li, Nan Li
Summary: In this study, a CoS2/MoS2 nanocomposite was fabricated and used as a catalyst for the N-2 reduction reaction. By modulating the interfacial charge distribution and promoting N-2 absorption, the catalyst exhibited excellent NRR performance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
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)