Article
Chemistry, Physical
Marta Cortese, Concetta Ruocco, Vincenzo Palma, Pedro J. Megia, Alicia Carrero, Jose A. Calles
Summary: This study found that CeO2 supported catalysts exhibit better performance in acetic acid steam reforming, but lead to more coke deposition and acetone generation, while chromium addition helps enhance catalytic activity and reduce coke deposition.
Article
Materials Science, Ceramics
Moises R. Cesario, Glageane S. Souza, Francisco J. A. Loureiro, Allan J. M. Araujo, Joao P. F. Grilo, Samer Aouad, Haingomalala L. Tidahy, Daniel A. Macedo, Duncan P. Fagg, Cedric Gennequin, Edmond Abi-Aad
Summary: This study compares Ni-based alloy anodes with different Cu and Co compositions in the dry reforming of methane reaction, demonstrating that Co-containing samples exhibit higher reducibility, activity, and resistance to carbon deposition. These findings suggest that Co-based compositions are advantageous for use as anodes in the CO2 reforming of methane in SOFCs.
CERAMICS INTERNATIONAL
(2021)
Article
Energy & Fuels
Eduardo Poggio-Fraccari, Antonella Abele, Nicolas Zitta, Javier Francesconi, Fernando Marino
Summary: The combination of Water Gas Shift (WGS) and CO preferential oxidation (COPROX) reactions is considered effective for CO removal in H-2 feed for PEM fuel cells. Monolithic catalysts coated with Ce or Ce-Pr and Cu or Cu-Ni showed promising results with a 35% mass increase. Adjusting the Pr content in WGS monoliths and using Cu/ceria monolithic samples for COPROX resulted in optimal activity-selectivity ratios. Operating at around 130 degrees C with a contact time of 0.1 g.s/cm^3 and an O-2/CO = 1 M ratio was found to be the most suitable parameters set.
Article
Chemistry, Physical
Gabriella R. Ferreira, Francisco G. E. Nogueira, Alessandra F. Lucredio, Elisabete M. Assaf
Summary: Ni-based catalysts supported on CeO2 doped with Gd were prepared and investigated for ethanol steam reforming reaction. The addition of Gd promoted the formation of solid solution between Gd and Ce, enhanced the metal-support interactions, and induced the formation of GdNiO ternary phase. The catalytic performance was dependent on Gd content and reaction temperature, with the 5Ni_5GdCeO(2) catalyst showing the best performance at 600°C.
Article
Materials Science, Ceramics
Igor Zagaynov, Ivan Shelepin, Anatoly A. Konovalov, Ekaterina A. Obraztsova, Alexander Naumkin, Alexey Bykov, Vladimir G. Leontiev
Summary: The Ceria-based solid solutions doped with Gd, Bi, and a third dopant were successfully synthesized using the co-precipitation method with ultrasonic treatment. The synthesized powders exhibited a cubic fluorite structure with an average particle size of 5-15 nm and a mesoporous structure with pore diameters of 2-5 nm. Among the solid solutions studied, the catalyst Gd0.05Bi0.15Mn0.20Ce0.60O2 showed the lowest oxidation temperature, indicating superior catalytic activity.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Tiancheng Pu, Jiacheng Chen, Weifeng Tu, Jing Xu, Yi-Fan Han, Israel E. Wachs, Minghui Zhu
Summary: In this study, the strong metal-support interaction (SMSI) phenomenon for supported Ni/CeO2 catalysts with different CeO2 nanomorphologies was systematically explored. The degree of encapsulation of Ni particles originating from the SMSI effect was found to be positively correlated with the CO2 hydrogenation activity. Quasi in situ XPS and in situ DRIFTS techniques were used to reveal the relevant species and reaction pathways. These findings provide a fundamental strategy for tailoring catalytic performance by adjusting the support surface structure.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Zhiyuan Li, Na Li, Nan Wang, Bing Zhou, Jun Yu, Boyu Song, Pan Yin, Yusen Yang
Summary: This study reports a new Cu-based nanocatalyst (Cu@ZnO/Al2O3) with superior catalytic performance and stability in low-temperature water-gas shift reaction (LT-WGSR). The catalyst, with abundant Cu@ZnO interface structure, shows a reaction rate 5 times higher than the commercial catalyst at 175℃.
Article
Chemistry, Applied
Luis Lopez-Rodriquez, Daniel G. Araiza, Diana G. Arcos, Antonio Gomez-Cortes, Gabriela Diaz
Summary: This study investigates the catalytic systems of Pt/CeO2 and bimetallic Cu-Pt/CeO2 catalysts supported on different CeO2 nano shapes (polyhedra, rods, and cubes) for hydrogen production from the methanol decomposition reaction. The properties of the bimetallic Cu-Pt/CeO2 samples were found to be support-morphology-dependent, with better copper and ceria reducibility in samples supported on polyhedra and rods. An improvement in oxygen vacancies was observed in the bimetallic system due to the interaction between copper and ceria. The bimetallic samples showed higher H-2 yield compared to platinum, making them suitable for hydrogen production from methanol decomposition.
Article
Chemistry, Physical
Yelisbeth Escalante, Manuel F. Gomez, Mariana N. Barroso
Summary: Co-CeO2/MgAl2O4 catalysts were synthesized with different impregnation orders of Co and Ce, and their performance in the ethanol steam reforming (ESR) reaction was evaluated. The impregnation order affected the interactions between metal-metal and/or metal-support, as well as the surface molar ratio of Co0/Con+, Ce3+/Ce4+, and Co/Ce, which in turn influenced the catalytic behavior in the ESR reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Agustin Salcedo, Pablo G. Lustemberg, Ning Rui, Robert M. Palomino, Zongyuan Liu, Slavomir Nemsak, Sanjaya D. Senanayake, Jose A. Rodriguez, M. Veronica Ganduglia-Pirovano, Beatriz Irigoyen
Summary: Ni/CeO2 catalysts show high activity for methane steam reforming at relatively low temperatures, effectively preventing coke formation, with hydroxyl-assisted CO formation providing a low-barrier pathway to prevent carbon accumulation.
Article
Chemistry, Physical
Jiadong Zhu, Diana Ciolca, Liang Liu, Alexander Parastaev, Nikolay Kosinov, Emiel J. M. Hensen
Summary: In this study, Cu-based catalysts were synthesized using different methods, with the addition of CeO2 found to enhance the CH3OH selectivity of Cu/ZnO-CeO2 catalysts. In situ IR spectroscopy revealed insights into the CO2 hydrogenation mechanism over Cu-Zn-Ce oxide catalysts.
Article
Energy & Fuels
Weijun Qiao, Shuqian Yang, Lei Zhang, Yuan Tian, Honghao Wang, Caishun Zhang, Zhixian Gao
Summary: Different divalent metals were used to prepare Cu-Ce/M-Al catalysts for hydrogen production from methanol steam reforming, with Ce-Cu/Zn-Al catalyst showing the best performance. The dispersion, reduction temperature, and oxygen vacancies on the surface played key roles in determining the catalytic performance of the catalysts. At optimal conditions, the methanol conversion reached 100% and the H-2 production rate was 779.7 STP cm(3) kg(-1) s(-1).
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Applied
Jing Liu, Gary Hodes, Junqing Yan, Shengzhong (Frank) Liu
Summary: The study introduced work function engineering by doping 3d metals into Mo2C to modulate the Fermi energy level, which enhanced the efficiency of the neutral hydrogen evolution reaction and improved photocatalytic efficiency. The modified work function also led to enhanced carrier transition and lowered Schottky barrier, ultimately improving the electrocatalytic performance.
CHINESE JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Biyun Fang, Zeliang Qi, Fangming Liu, Chuanfeng Zhang, Chunyan Li, Jun Ni, Jianxin Lin, Bingyu Lin, Lilong Jiang
Summary: The development of efficient oxide-supported bimetallic catalysts is crucial for ammonia synthesis or other hydrogen-involved reactions. In this study, ceria-supported Co-Mo bimetallic catalysts with different properties were designed by changing the addition of Mo, resulting in enhanced ammonia synthesis activities. It was found that the negative effect of molybdenum oxide on the reduction of the bimetallic catalyst could be effectively alleviated by the subsequent addition of Mo species, leading to improved catalyst activity.
JOURNAL OF CATALYSIS
(2022)
Article
Energy & Fuels
Naeemeh Sadat Maboudi, Fereshteh Meshkani, Mehran Rezaei
Summary: In this study, Ni-Cu based catalysts supported on different nanocrystalline powders were prepared and investigated for high-temperature water gas shift (HTWGS) reaction. The effects of Ni and Cu loadings, calcination and reduction temperatures, GHSV, and steam/gas molar ratio on the catalytic performance were studied. The results showed that 7 wt%Ni-7.5 wt%Cu/CeO2-Al2O3 catalyst exhibited higher CO conversion and stability.
JOURNAL OF THE ENERGY INSTITUTE
(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)