Article
Chemistry, Physical
Guixian Deng, Guifang Zhang, Xing Zhu, Qingjie Guo, Xiangbiao Liao, Xi Chen, Kongzhai Li
Summary: The modification of Ni-based catalysts by CeO2 and ZrO2 suppresses the negative effect of O-2, leading to high CH4 and CO2 conversion rates even at high temperatures. The interaction among Ni, CeO2, and ZrO2 results in well-dispersed Ni particles, contributing to long-term catalyst stability and high conversion rates.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Silvera Scaccia, Livia Della Seta, Daniele Mirabile Gattia, Giuseppina Vanga
Summary: A novel Ni/CaO-Ca12Al14O33 catalyst was prepared by Ni wet impregnation on a mixed calcium-aluminum-oxide (CAO) support, which exhibited good stability and low carbon deposition during dry reforming of methane. In contrast to the reference catalyst Ni/gamma-Al2O3, the novel catalyst showed higher basicity and better performance in the reaction.
JOURNAL OF CO2 UTILIZATION
(2021)
Article
Chemistry, Multidisciplinary
Milad Irani, Mahsa Mehrara, Parisa Mojaver, Ata Chitsaz
Summary: This study evaluates and compares a hybrid system of solar methane reforming, including different reforming technologies, gas turbine performance, solar tower plant performance, and CO2 capture and recycle unit. The results show that bi-reforming and auto-reforming require the least solar energy, while the tri-reforming coupled system has the highest power production of the gas turbine.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Multidisciplinary Sciences
Zenan Ni, Xavier Djitcheu, Xiaoxu Gao, Jian Wang, Huimin Liu, Qijian Zhang
Summary: This study investigates the matching between Ni and CeO2 on different prepared Ni/CeO2 catalysts and its effect on CO2 reforming of CH4 (CRM). It is found that Ni/CeO2-H prepared by the hydrothermal method shows the best catalytic performance with an initial conversion rate over five times higher than Ni/CeO2-P prepared by precipitation method and Ni/CeO2-C prepared using commercial CeO2.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Applied
Yikyeom Kim, Hyun Suk Lim, Minbeom Lee, Jae W. Lee
Summary: The study achieved complete methane conversion using abundant metal oxide particles by utilizing deposited surface carbon as a reaction intermediate. Incorporating Ni into the Fe-Al oxide overcame agglomeration and performance decline issues, while also improving CH4 activation and carbon gasification kinetics.
Article
Chemistry, Multidisciplinary
Xianjin Huang, Wenlong Mo, Xiaoqiang He, Xing Fan, Fengyun Ma, Dilhumar Tax
Summary: The performance of Ni-Al2O3 catalysts modified with different metal elements (Ca, Co, and Ce) was studied, with Co-Ni-Al2O3 catalyst showing the best performance and Ce-Ni-Al2O3 catalyst having the least carbon deposition. Ca-Ni-Al2O3 catalyst exhibited poor carbon resistance.
Article
Energy & Fuels
Xiangyu Yan, Buchu Lu, Hao Dong, Qibin Liu
Summary: Combining solar light and heat in dry reforming of methane (DRM) is a promising technology for CO2 reduction and increased solar energy utilization. The mechanism of the reaction and the synergistic effects of solar light and heat in DRM are investigated using a nanoscale Ni/CeO2 catalyst. The results show that the conversion rate of CH4 increases by 39.74% and the reaction temperature is reduced by 45 degrees C under photo-thermochemical conditions. Solar light enhances the dissociation of CH4 and the production of HCOO* on the catalyst surface, leading to improved DRM performance. These findings contribute to the understanding of the synergistic effects of solar light and heat and guide the conversion of CO2 into fuel using solar energy.
Article
Chemistry, Physical
Zhige Zhang, Guofeng Zhao, Han Bing, Jiawei Zhong, Haoran Yuan, Jun Xie, Yong Chen
Summary: The study successfully developed and applied the Ni-Ce1-xZrxO2/SiC-F catalyst, achieving efficient reforming of biogas. The catalyst exhibited excellent catalytic activity and the ability to inhibit sintering and coke deposition.
SUSTAINABLE ENERGY & FUELS
(2021)
Article
Chemistry, Physical
Lola Azancot, Vincent Blay, Ruben Blay-Roger, Luis F. Bobadilla, Anna Penkova, Miguel A. Centeno, Jose A. Odriozola
Summary: This study investigates the role of potassium as a promoter in Ni-based catalysts for reducing coke deposition during catalytic dry reforming. By identifying new Ni-O-K chemical states and studying their effect on the catalyst's properties, the study provides new insights into the relationship between catalytic performance and physicochemical properties. The formation of Ni-O-K is found to significantly enhance the catalyst's long-term stability in dry reforming, suggesting new directions for designing more efficient catalysts for sustainable gas-to-liquids processes.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Physical
Yu Shi, Lei Wang, Mengmeng Wu, Fagen Wang
Summary: In this study, Ni/CeO2-SiC catalysts were designed for methane dry reforming (MDR) under microwave irradiation. The microwave adsorption increased the catalyst surface temperature, significantly enhancing the MDR performance and reducing carbon deposition. On the 1Ni/CeO2-SiC catalyst, the conversion rates of CH4 and CO2 reached 16.5 mmol/(gNi center dot s) and 18.6 mmol/(gNi s), respectively, which were one order-of-magnitude higher than those in literature. The carbon deposits by microwave catalysis were 1.4 wt%, compared to 5.0 wt% by thermal catalysis on the used 1Ni/CeO2-SiC catalyst.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Applied
Beom-Jun Kim, Ho-Ryong Park, Yeol-Lim Lee, Seon-Yong Ahn, Kyoung-Jin Kim, Hyun-Seog Roh
Summary: We developed a customized Ni-MgO-Al2O3 catalyst for dry reforming of methane using coke oven gas. The catalyst's calcination conditions were controlled to regulate the surface properties and investigate their influence on catalytic performance. The characterization results revealed that physicochemical properties such as basicity, surface area, dispersion of Ni, Ni crystallite size, and reducibility varied with the calcination temperature. By optimizing the operating conditions based on the gas composition, maximum CO yield and minimum carbon deposition were achieved. Among the catalysts tested, the Ni-MgO-Al2O3 catalyst calcined at 800°C exhibited the best catalytic performance due to high Ni active sites and good basicity.
Article
Chemistry, Physical
Valeria La Parola, Leonarda Francesca Liotta, Giuseppe Pantaleo, Maria Luisa Testa, Anna Maria Venezia
Summary: Two series of catalysts containing nickel supported on silica modified by TiO2 and ZrO2 were tested in the dry reforming of methane (DRM). The results showed that doping silica with titanium oxide increased the methane conversion and catalytic stability, while the presence of zirconium had little effect. After the catalytic test, all the catalysts formed carbon, but to a lesser extent for the ones with grafted supports. Structural characterization confirmed the better structural stability of the nickel particles supported on the sol-gel doped silica, explaining the improvement of catalytic stability during the DRM reaction.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Applied
Zhige Zhang, Guofeng Zhao, Guican Bi, Yunyv Guo, Jun Xie
Summary: By modifying the catalyst structure, a Ni-La2O3/SiC-foam nanocomposite catalyst with enhanced performance was successfully prepared, significantly improving the methane and carbon dioxide conversion rates, while also exhibiting stronger resistance to coke deposition and Ni sintering.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Applied
Muhammad Masood Khan, Lijun Jin, Muhammad Mahmood Khan, Yang Li, Hammad Saulat, Yun Zhang, Muhammad Sarfraz, Jialong Zhu, Haoquan Hu
Summary: The addition of activated carbon to Ni/MgO-Al2O3 catalyst improved textural properties, increased surface area and pore volume, and decreased the size of metal Ni. The 10% activated carbon loading in 10AC-Ni/MgO-Al2O3 exhibited the best catalytic activity and stability.
FUEL PROCESSING TECHNOLOGY
(2021)
Review
Chemistry, Multidisciplinary
Jiayu Feng, Xin Sun, Zhao Li, Xingguang Hao, Maohong Fan, Ping Ning, Kai Li
Summary: This paper reviews the significant progress in plasma-assisted reforming of methane (PARM) from the perspectives of reactor development, thermal and nonthermal PARM routes, and catalysis. The factors affecting the conversion of reactants and the selectivity of products are studied. The findings and insights from this work should benefit the further development of reactors, high-performance catalysts, and PARM routes.
Article
Chemistry, Applied
Qingyuan Zheng, Jack H. Williams, Scott Elgersma, Mick D. Mantle, Andrew J. Sederman, G. Leendert Bezemer, Constant M. Guedon, Lynn F. Gladden
Summary: In this study, a pilot-scale fixed-bed reactor compatible with NMR/MRI was developed for Fischer-Tropsch synthesis. Multiple magnetic resonance techniques were applied to quantitatively characterize different product species within catalyst pellets, providing valuable information for catalyst and reactor optimization.
Article
Chemistry, Applied
Lisa Ramisch, Sebastian Pfaff, Sabrina M. Gericke, Edvin Lundgren, Johan Zetterberg
Summary: We present a combination of optical operando techniques that allow simultaneous measurement of adsorbed species on catalyst surfaces, monitoring of surface oxide formation, and imaging of the gas phase above the catalyst surface. The experimental setup was validated by studying CO oxidation on Pd(100) at different pressures, revealing the effects of pressure on the heterogeneous catalytic reaction.
Article
Chemistry, Applied
Marta Paniagua, Gabriel Morales, Juan A. Melero, Daniel Garcia-Salgado
Summary: The influence of common impurities in levulinic acid on the catalytic performance of different acid catalysts for bio-jet fuel production was studied. It was found that furfural had the greatest detrimental effect on catalyst performance, while propyl-sulfonic acid-modified SBA-15 and sulfonic acid resin Amberlyst-70 showed good regeneration ability.
Article
Chemistry, Applied
Jesus Tapiador, Pedro Leo, Guillermo Calleja, Gisela Orcajo
Summary: This study presents a new MOF material, Zn-URJC-13, with acid and basic sites, permanent porosity, and high affinity to CO2 molecules. The Zn-URJC-13 catalyst exhibits efficient performance in CO2 cycloaddition reactions and can be reused multiple times.
Article
Chemistry, Applied
Dan Zhao, Vita A. Kondratenko, Dmitry E. Doronkin, Shanlei Han, Jan-Dierk Grunwaldt, Uwe Rodemerck, David Linke, Evgenii V. Kondratenko
Summary: This study demonstrates the potential of cheap and commercially available Zr or Ti-based supports and ZnO to serve as active and selective catalysts for propane dehydrogenation (PDH). The catalytically active species formed in situ under PDH conditions consist of isolated ZnOx. ZnOx on the surface of LaZrOx shows the highest rate of propene formation.
Article
Chemistry, Applied
Hanbyeol Kim, Jung Rae Kim, Young-Kwon Park, Jeong-Myeong Ha, Jungho Jae
Summary: In this study, metal phosphates were used as catalysts for biomass conversion to produce sustainable aromatics through DielsAlder cycloaddition reactions. The effects of synthesis method, activation method, and P/Ti molar ratio on the structure and acid properties of titanium phosphate catalysts were systematically studied. The mesoporous titanium phosphate catalyst synthesized by hydrothermal method at 180℃ for 12 h followed by ethanol refluxing at 60℃ for 24 h at a molar P/Ti ratio of 1 showed the highest surface area and acid site density.
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Applied
Michael Franc, Ivana Cisarova, Jan Vesely
Summary: The present study investigates an enantioselective cyclization of enals with imidazolone derivatives catalyzed by a combination of achiral Pd(0) complex and chiral secondary amine. Corresponding spirocyclic imidazolones were produced in high yields with moderate diastereoselectivity and excellent enantioselectivity. The developed co-operative catalytic methodology provides a highly substituted spirocyclic scaffold with four stereogenic centers under mild conditions.
Article
Chemistry, Applied
Mauro Alvarez, Jennifer Cueto, David P. Serrano, Pablo Marin, Salvador Ordonez
Summary: This study focuses on improving the formulation and preparation methods of catalysts for the production of dimethyl carbonate. By using suitable catalyst preparation methods and copper salt precursors, the researchers successfully produced catalysts with optimal performance for dimethyl carbonate formation.
Article
Chemistry, Applied
Claudia J. Keijzer, Luc C. J. Smulders, Dennie Wezendonk, Jan Willem de Rijk, Petra E. de Jongh
Summary: This study investigates the catalytic behavior of alpha-alumina supported silver catalysts in the presence of chloride. It is found that the particle size of silver can affect the selectivity of the catalyst, but different strategies lead to different results. In this size range, the selectivity of ethylene oxide is correlated to the Ag : Al2O3 surface ratio.
Article
Chemistry, Applied
Takeshi Aihara, Wataru Aoki, Michikazu Hara, Keigo Kamata
Summary: The development of acid-base bifunctional catalysts is important for promoting specific chemical transformations. In this study, Ti-based perovskite oxides were synthesized and used as catalysts for two C-C bond-forming reactions (cyanosilylation and Knoevenagel condensation). The highly pure SrTiO3 nanoparticles with a high specific surface area exhibited the highest catalytic performance, and could be easily recovered and reused.
Article
Chemistry, Applied
Olga Gorlova, Petra Pribylova, Eliska Vyskocilova, Katerina Peroutkova, Jan Kohout, Iva Paterova
Summary: This study investigates the Baeyer-Villiger oxidation of beta-cyclocitral using tin-modified mixed oxides as catalysts. The optimal reaction conditions and the effects of various factors on the reaction course and selectivity were determined. The results show that tin-modified mixed oxides exhibit high activity and selectivity in the oxidation reaction.
Article
Chemistry, Applied
M. I. Avila, M. M. Alonso-Doncel, L. Briones, G. Gomez-Pozuelo, J. M. Escola, D. P. Serrano, A. Peral, J. A. Botas
Summary: The catalytic fast pyrolysis of lignin using ion-exchanged zeolite catalysts showed significant improvements in bio-oil quality and the production of aromatic hydrocarbons and oxygenated compounds.
Article
Chemistry, Applied
Enrico Catizzone, Giorgia Ferrarelli, Paolo Bruno, Girolamo Giordano, Massimo Migliori
Summary: The acid-catalysed alcohol conversion reaction is a promising route for de-fossilization strategies. Research on pure alcohol conversion and simultaneous dehydration of mixed alcohols have shown different product compositions, with the type and distribution of acid sites affecting the reaction mechanism.
Article
Chemistry, Applied
Alireza Ranjbari, Juho Kim, Jihee Yu, Jiyun Kim, Mireu Park, Nayoung Kim, Kristof Demeestere, Philippe M. Heynderickx
Summary: This study investigated a novel kinetic model for the adsorption and photocatalytic degradation of methyl orange using commercial ZnO and reduced ZnO photocatalysts. The results provided new insights into the interaction of catalysts with molecules of different charges and compared with a previous study on methylene blue. The presence of oxygen vacancies in ZnO and their effects on adsorption and photocatalytic degradation were analyzed, and the photocatalytic degradation rate of reduced ZnO was found to increase significantly.