Article
Energy & Fuels
Fatemeh Salahi, Fatemeh Zarei-Jelyani, Maryam Meshksar, Mohammad Farsi, Mohammad Reza Rahimpour
Summary: This study focuses on the application of Y-promoted Ni-based catalysts supported on bulk and hollow Al2O3 supports in the steam reforming of methane process. Various characterizing techniques were employed to analyze the catalysts. The 20Ni-3.0Y/HAl catalyst showed the highest methane conversion, hydrogen yield, and H2/CO molar ratio at 700 degrees C, possibly due to the larger surface area of the hollow alumina support compared to the bulk one.
Article
Chemistry, Applied
Paola Riani, Gabriella Garbarino, Tullio Cavattoni, Guido Busca
Summary: Two Co/SiO2 catalysts exhibit different catalytic behaviors in CO2 methanation and reverse water gas shift reactions, with carbon nanotubes produced not affecting the catalyst activity.
Article
Chemistry, Inorganic & Nuclear
Cong Suo, Yang Liu, Xiao Zhang, Haiyan Wang, Bingbing Chen, Jiancong Fang, Zhenguo Zhang, Ruoyu Chen, Rui Chen, Chuan Shi
Summary: This study presents a method of preparing embedded Ni@PSi catalysts by adjusting the reduction temperature, which effectively prevents the sintering of Ni nanoparticles and maintains stability. The optimized reduction temperature of 600 degrees C results in a catalyst with high reaction rate and stability.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Robert Franz, Frans D. Tichelaar, Evgeny A. Uslamin, Evgeny A. Pidko
Summary: The study investigated the impact of passivation on the catalytic performance of Ni/Al2O3 catalysts in dry reforming of methane, showing that changes in conversion and coke content can track sintering of Ni particles. The study also revealed adverse effects of catalyst passivation in excess O2, leading to rapid local overheating and Ni sintering, even at small catalyst scales.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Multidisciplinary
Andrea Alvarez Moreno, Tomas Ramirez-Reina, Svetlana Ivanova, Anne-Cecile Roger, Miguel Angel Centeno, Jose Antonio Odriozola
Summary: When it comes to dry reforming of methane, selecting the right noble metal promoter is crucial. Research shows that Ru promoter is more effective in enhancing catalytic activity and reducing coke deposition for DRM.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Physical
Pawel Mierczynski, Magdalena Mosinska, Waldemar Maniukiewicz, Krasimir Vasilev, Malgorzata Iwona Szynkowska-Jozwik
Summary: This study compares the physicochemical and reactivity of various bimetallic Pt-Ni, Pd-Ni, Ru-Ni, and Ag-Ni catalysts in the oxy-steam reforming of LNG for hydrogen generation. The 1%Pt-5%Ni catalyst supported on CeO2·ZrO2 (1:2) system demonstrated the highest activity, showing potential for hydrogen production for solid oxide fuel cells.
Article
Chemistry, Physical
Robert Franz, Donato Pinto, Evgeny A. Uslamin, Atsushi Urakawa, Evgeny A. Pidko
Summary: This study investigates the use of Ni/Al2O3 catalysts for dry reforming of methane, with a focus on the effects of different promoters on catalyst stability. Higher iron loading on the catalyst leads to lower coke formation during dry reforming. Additionally, promoters with high CO2 affinity can accelerate catalyst oxidation during regeneration, ultimately leading to sintering and increased coke formation. Promoters with significant CO2 interaction are more effective on sintered catalyst samples compared to unpromoted Ni/Al2O3.
Article
Chemistry, Physical
Tae-Young Kim, Jong-Heon Lee, Seongbin Jo, Jueon Kim, Jin-Hyeok Woo, Ragupathy Dhanusuraman, Jae-Chang Kim, Soo-Chool Lee
Summary: A Ru-doped Ni pellet-type catalyst was prepared for hydrogen production via steam methane reforming (SMR). The addition of a small amount of Ru improved Ni dispersion and increased catalytic activity. The Ni catalysts experienced a significant decrease in CH4 conversion during daily startup and shutdown (DSS) operations due to incomplete reduction of NiAl2O4 formed by Ni metal oxidation. However, the oxidized Ni species in the Ru-Ni catalyst could be reduced under SMR conditions, resulting in improved catalytic activity and stability during DSS operation.
Article
Chemistry, Applied
Mauricio Musso, Alejandra Cardozo, Mariano Romero, Ricardo Faccio, Dario Segobia, Carlos Apesteguia, Juan Bussi
Summary: Ni catalysts supported on rare-earth zirconates prepared by sol-gel technique showed high activity for hydrogen production through bioethanol steam reforming. Catalysts containing Y exhibited better performance than those containing La, with better resistance to carbonaceous residues formation.
Article
Chemistry, Multidisciplinary
Lyudmila Okhlopkova, Igor Prosvirin, Mikhail Kerzhentsev, Zinfer Ismagilov
Summary: The sol-gel template technique was used to synthesize a stable and efficient nickel catalyst based on magnesium-modified cerium oxide for the combined steam and CO2 reforming of methane. Different parameters, such as support precursor, active component composition, and method of introducing nanoparticles, were varied to stabilize the dispersed forms of the active component. The development of an efficient and stable Ni0.194Pd0.006Ce0.4Mg0.4O1.4 catalyst for the conversion of CO2 into important chemicals was achieved with a yield of over 75%.
APPLIED SCIENCES-BASEL
(2023)
Review
Chemistry, Physical
Siqi Wang, Seyed A. Nabavi, Peter T. Clough
Summary: Blue hydrogen production by steam methane reforming (SMR) with carbon capture is the most commercially viable method, and sorption-enhanced steam methane reforming (SESMR) can further decrease the cost of H2 production. Introducing additional metal elements to improve the performance and prevent catalyst deactivation has been an effective solution. This review summarizes recent developments and highlights the potential of bi/polymetallic catalysts for SMR.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Environmental
Kyung-Won Jeon, Jin Koo Kim, Beom-Jun Kim, Won-Jun Jang, Yun Chan Kang, Hyun-Seog Roh
Summary: The study demonstrates that Ni/Al2O3 yolk-shell catalysts have high resistance against alkali poisoning and exhibit excellent carbon deposition resistance. Among them, the Ni/pys-Al2O3 catalyst shows the highest methane conversion and the best stability at a high gas hourly space velocity.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Jose L. C. Fajin, M. Natalia D. S. Cordeiro
Summary: Ni-Cu catalysts are low cost, highly selective for CO2 and H-2 in methanol steam reforming, blocking the production of methane, CO, and coke. The mechanism of methanol steam reforming on Ni-Cu surfaces involves methanol decomposition followed by the water-gas shift reaction, with a minority route for direct CO2 formation. The Ni-Cu alloy suppresses methane and coke formation and has a high desorption barrier for CO species, avoiding its production.
Article
Chemistry, Physical
Wenqing Zeng, Li Li, Mouxiao Song, Xueshuang Wu, Guiying Li, Changwei Hu
Summary: This study finds that hydrogen treatment enhances catalytic activity and stability by forming small homogeneous nickel particles, while nitrogen and air treatment decreases activity and causes carbon accumulation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Environmental
Moshe Sheintuch, Ernst D. German
Summary: This study aims to evaluate the permeance inhibition caused by the effect on the Pd membrane surface, analyzing the kinetic parameters of Pd surface catalyzed reactions and surface composition using a micro-kinetic model. The research finds that inhibition due to surface intermediates on Pd may be strong at relatively high temperatures and low hydrogen concentrations, but negligible under other conditions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
B. M. Faroldi, J. M. Conesa, A. Guerrero-Ruiz, I Rodriguez-Ramos
Summary: The bimetallic Ni-Cu catalyst doped with potassium exhibited the best catalytic performance in the formic acid decomposition reaction, with high conversion rate and selectivity to hydrogen.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Multidisciplinary
Ana Belen Dongil, Elodie Blanco, Juan Jose Villora-Pico, Antonio Sepulveda-Escribano, Inmaculada Rodriguez-Ramos
Summary: The synthesis of methanol by carbon dioxide hydrogenation using copper-molybdenum carbides supported on various materials was studied. The effects of synthesis conditions and the support on the catalyst were investigated. The results showed that the catalyst prepared on high surface area graphite achieved the highest selectivity to methanol.
Article
Engineering, Environmental
Catia Azenha, Cecilia Mateos-Pedrero, Manuel Alvarez-Guerra, Angel Irabien, Adelio Mendes
Summary: A series of CuBi catalysts with different Bi loadings were prepared and tested for the electrochemical reduction of CO2. Two catalysts showed remarkable selectivity, one for formate production and the other for propane production. The superior catalytic behavior can be attributed to the presence of different CO2 adsorption sites on the catalyst surface.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Hugo C. Novais, Bruno Jarrais, Ali Haider, Ulrich Kortz, Antonio Guerrero-Ruiz, Inmaculada Rodriguez-Ramos, Cristina Freire, Diana M. Fernandes
Summary: This study develops novel low-cost electrocatalysts with high electrocatalytic activity for fuel cells. The four composites prepared based on carbon materials show excellent electrocatalytic activity and tolerance in alkaline medium, with low Tafel slopes and good electrochemical stability.
Article
Chemistry, Multidisciplinary
Enrique Garcia-Bordeje, Ana Belen Dongil, Jorge Moral, Jose M. Conesa, Antonio Guerrero-Ruiz, Inmaculada Rodriguez-Ramos
Summary: Bifunctional materials based on Ru nanoparticles and alkaline metals have been studied for CO2 capture and subsequent methanation. Optimum performance was achieved at different temperature windows for each material, with the highest activity found in Ba-containing materials. These materials exhibited stable cyclic performance even in the presence of O2 and H2O.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Chemistry, Multidisciplinary
Catia Azenha, Cecilia Mateos-Pedrero, Tiago Lagarteira, Adelio M. Mendes
Summary: Different post-synthesis procedures were employed to enhance the performance of a Cu2O/ZnO catalyst for the electrochemical reduction of CO2. The procedures successfully controlled important physicochemical parameters, such as oxidation state, number of oxygen defects, crystallite size, and the strength of the copper-zinc interaction. It was demonstrated that the H2/CO production ratio (syngas composition) can be tuned by applying in situ potential cycling treatments before the electrochemical measurements under the reaction conditions. For an applied potential of -1.0 VRHE, the H2/CO ratio values of 2.5, 5, and 0.7 were obtained using the same catalyst subjected to different post-synthesis procedures.
JOURNAL OF CO2 UTILIZATION
(2023)
Article
Agriculture, Multidisciplinary
Virginia Cruz Fernandes, Valentina F. Domingues, Marta S. Nunes, Renata Matos, Iwona Kuzniarska-Biernacka, Diana M. Fernandes, Antonio Guerrero-Ruiz, Inmaculada Rodriguez Ramos, Cristina Freire, Cristina Delerue-Matos
Summary: A new application of graphene-type materials combined with GC-ECD/GC-MS/GC-MS/MS detection was used for the simultaneous analysis of 12 brominated flame retardants in Capsicum cultivar samples. The materials showed good adsorption capability and did not compromise the extraction efficiency of target analytes. The developed method exhibited excellent recoveries, good linearity, and low limits of quantification.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Esther Asedegbega-Nieto, Ana Iglesias-Juez, Marco Di Michiel, Marcos Fernandez-Garcia, Inmaculada Rodriguez-Ramos, Antonio Guerrero-Ruiz
Summary: Structure-sensitive catalyzed reactions can be influenced by several parameters. It has been established that Pd-C species are responsible for the behavior of Pd nanoparticles in a butadiene hydrogenation reaction. Experimental evidence suggests that subsurface Pd hydride species govern the reactivity of this reaction, and the formation/decomposition of PdHx species is sensitive to the dimensions of Pd nanoparticle aggregates, which controls the selectivity in this process. High-energy X-ray diffraction (HEXRD) is the main methodology used to determine this reaction mechanism.
Article
Chemistry, Applied
J. M. Fernandez-Morales, L. Martinez-Quintana, A. B. Dongil, E. Asedegbega, E. Castillejos, I. Rodriguez-Ramos, A. Guerrero-Ruiz
Summary: In this study, the conversion of 1-butene was investigated over Mo carbides and Ni, Co and Mo phosphides as catalysts, using a 1-butene/helium mixture in a molar ratio of 4:1. The conversion rate ranged from 30-44% and was relatively stable, except for certain catalysts. The main reaction observed was isomerization of 1-butene, with higher selectivity towards dimerization on certain catalysts.
Article
Engineering, Environmental
Elena Montejano-Nares, Blanca Martinez-Navarro, Eva Castillejos Lopez, Esther Asedegbega-Nieto, Angel Maroto Valiente, Jose M. Conesa Alonso, Inmaculada Rodriguez Ramos, Antonio R. Guerrero Ruiz, Francisco Ivars-Barcelo
Summary: This study demonstrates the significant activity for the direct transformation of methane and carbon dioxide into coupling products. Through the development of a multifunctional catalyst, methane and carbon dioxide can be activated and selectively transformed at low reaction temperatures and pressures. The primary and secondary reaction products were determined to be acetone and dimethyl ether, respectively, based on experimental and theoretical studies.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Alejandro Jimenez, Raquel Trujillano, Vicente Rives, M. A. Soria, Lufs M. Madeira, Miguel Angel Vicente
Summary: Potentially-CO2 adsorbing solids were prepared by calcination of CaAlFe hydrocalumites at 400 and 750 degrees C. The obtained solids were characterized using different techniques, and the CO2 sorption capacity was evaluated under different conditions. The presence of Fe3+ influenced the crystalline phases and the maximum CO2 sorption capacity was achieved when Fe3+ accounted for 40 mol % of the trivalent positions. The steam presence enhanced the CO2 capture during multiple sorption-desorption cycles.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Enrique Garcia-Bordeje, Ana Belen Dongil, Jose M. Conesa, Antonio Guerrero-Ruiz, Inmaculada Rodriguez-Ramos
Summary: Bimetallic catalysts consisting of nickel and alkali or alkaline-earth metal on alumina support were tested for cyclic CO2 capture and methanation. Different materials showed the best performance in the cyclic tests (K-Ni/Al) compared to the Sabatier reaction (Ba-Ni/Al). The methane productivity in cyclic tests varied with temperature for each alkali and alkaline-earth metal.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Joao Brito, F. Pinto, Alexandre Ferreira, M. A. Soria, Luis M. Madeira
Summary: Biomass gasification produces syngas containing various components such as hydrogen, carbon monoxide, carbon dioxide, methane, water, and higher hydrocarbons like ethane. A study on the steam reforming process of five different streams, obtained from three biomass sources, was conducted using Aspen Plus V12 software and Gibbs energy minimization method. Various operating conditions were assessed, and it was found that temperature, pressure, and steam-to-carbon ratio significantly influenced the hydrogen content in the streams. The hydrogen purity and yield were highest for the stream obtained from the gasification of Lignin followed by conditioning, while coke formation could be mitigated by specific conditions.
FUEL PROCESSING TECHNOLOGY
(2023)
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.
