Article
Chemistry, Applied
Dragana Prokic-Vidojevic, Sandra B. Glisic, Jugoslav B. Krstic, Aleksandar M. Orlovic
Summary: The Re/Pd-TiO2/SiO2 aerogel catalysts synthesized using sol-gel method and super-critical drying showed higher catalytic activity in hydrodesulphurisation of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT) compared to Co/Mo-Al2O3/SiO2 aerogel catalysts. This can be attributed to well dispersed active phases, incorporation of Ti within silica matrix, increased mesopore volumes and high specific surface areas in Re/Pd-TiO2/SiO2 aerogels.
Article
Chemistry, Multidisciplinary
Meng Huang, Wenbin Huang, Anqi Li, Han Yang, Yijing Jia, Zhiqing Yu, Zhusong Xu, Xiaohan Wang, Yasong Zhou, Qiang Wei
Summary: Experiments were conducted to investigate the effects of Ga2O3 modification on the hydrodesulfurization performance of 4,6-dimethyldibenzothiophene catalysis. The introduction of Ga2O3 with appropriate content was found to enhance the dispersion of Ni and Mo species, increase the average stacking number and length of MoS2, and improve the specific surface area and acid sites. This resulted in increased adsorption of reactant molecules and improved HDS reactions.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Paola Riani, Ioannis Valsamakis, Tullio Cavattoni, Vicente Sanchez Escribano, Guido Busca, Gabriella Garbarino
Summary: Ni-based catalysts with enhanced thermal stability and catalytic performance for CO2 methanation have been synthesized, and it was found that La2O3 plays a promoting role in the reaction.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Kun Sun, Ge Yang, Jiaxin Han, Yongming Chai, Yanpeng Li, Chunzheng Wang, Svetlana Mintova, Chenguang Liu, Hailing Guo
Summary: A composite catalyst consisting of sulfur-tolerant Ni/Al2O3@SOD and MoS2/Al2O3 was developed for the hydrodesulfurization of dibenzothiophene. The catalyst showed high catalytic activity and selectivity, making it a promising option for desulfurization applications.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Chemistry, Physical
Parisa Shafiee, Seyed Mehdi Alavi, Mehran Rezaei, Farzad Jokar
Summary: Fe, Mn, La, Ce, and Ba-promoted 15 wt%Ni-12.5 wt%Co-Al2O3 catalysts show improved catalytic performance in CO2 methanation reaction, with the Fe-promoted catalyst exhibiting the highest catalytic activity. The study also evaluated the effect of calcination temperature, feed composition, and gas hourly space velocity (GHSV) on the catalyst performance, confirming the Fe-promoted catalyst's superior performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Jangam Ashok, Sonali Das, Nikita Dewangan, Sibudjing Kawi
Summary: The study investigated the use of CaO-Al2O3 based hydrotalcite structure derived catalyst precursors for syngas production via steam reforming of a diesel model compound. The Co-CaO-Al2O3 catalyst showed the best performance in terms of n-dodecane conversion, stability, and carbon suppression among all catalysts tested.
Article
Chemistry, Multidisciplinary
Ryan M. Claydon, Luis A. Roman-Ramirez, Joseph Wood
Summary: The study shows that the Mo-MMO catalyst exhibits comparable reaction rates to Pd-2%/Al2O3 catalyst and significant advantage in cis-decalin production, offering the opportunity for generating more alkyl naphthenes in subsequent hydrodecyclization reactions. On the other hand, Pd catalysts supported on Al2O3 tend to preferentially produce trans-decalin due to the electronic properties of Pd catalysts influencing octalin intermediate orientations on the catalyst surface.
Article
Energy & Fuels
Anna A. Salomatina, Ksenia A. Nadeina, Oleg V. V. Klimov, Irina G. Danilova, Evgeny Yu. Gerasimov, Igor P. Prosvirin, Vera P. Pakharukova, Yuriy A. Chesalov, Alexander S. Noskov
Summary: This study aimed to investigate the effect of NiMo/gamma-Al2O3 catalyst composition on its catalytic properties. The results showed that increasing the Ni/Mo molar ratio affected the formation of sulfide active component and decreased the interaction between active metals and the support. The excess nickel also contributed to the promotion of MoS2 particles and the formation of bulk nickel sulfide particles.
Article
Chemistry, Multidisciplinary
Josue Alves Melo, Mirele Santana de Sa, Ainara Moral, Fernando Bimbela, Luis M. Gandia, Alberto Wisniewski
Summary: Renewable hydrocarbons were produced from waste cottonseed oil through micropyrolysis, and catalytic upgrading of the pyrolysis vapors was investigated using various catalysts. Results showed that Mo-Co/gamma-Al2O3 catalyst had the highest conversion yields into total renewable hydrocarbons, indicating its effectiveness in the process.
Article
Energy & Fuels
Mahdi Karimi Boroujeni, Abdullah Irankhah
Summary: Different catalysts were synthesized through the wetness impregnation technique and characterized using various methods. These catalysts showed varying catalytic activities in HDS reactions. It was found in the experiment that the Ni-Mo/gamma-Al2O3 catalyst exhibited the best reactor performance and long-term stability.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
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
Chemistry, Applied
Christos Papadopoulos, Eleana Kordouli, Labrini Sygellou, Kyriakos Bourikas, Christos Kordulis, Alexis Lycourghiotis
Summary: In this study, the promoting action of tungsten (W) in Ni-Al2O3 co-precipitated catalysts with high nickel loading was investigated. It was found that a WNi-Al2O3 catalyst containing 8 wt% W and 35 wt% Ni showed the highest efficiency, attributed to various factors such as increasing specific surface area, regulating acidity, decreasing inactive nickel-aluminate formation, and the participation of W5+-oxo species. The optimal reduction-activation temperature was identified to be 500°C, balancing various factors for improved performance.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Jin Li, Qing Guo, Yu Zhao, Shaozhong Li
Summary: CO selective methanation is important for proton exchange membrane fuel cell, but CO2 methanation consumes a lot of hydrogen and reduces energy efficiency. Phosphate-modified mesostructured Al2O3-ZrO2 as Ni support was studied for CO methanation. Phosphate modification inhibited CO2 adsorption and increased CO methanation selectivity, but excessive modification weakened active sites and decreased methanation activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Qing Guo, Shaozhong Li, Jin Li, Yongke Hu, Yanxing Li
Summary: CO selective methanation is a reliable and efficient method for deep CO removal from H-2-rich reformate gases in proton exchange membrane fuel cell (PEMFC). The addition of SiO2 into Ni-ZrO2 catalysts increased the specific surface areas and dispersion of metallic Ni, leading to higher CO adsorption quantity and improved conversion at low temperature. SiO2 also weakened the surface basicity of the catalyst, decreasing CO2 adsorption strength and quantity, which inhibited CO2 methanation and resulted in higher selectivity for CO methanation.
Article
Chemistry, Physical
Sabrina Maria Gericke, Jenny Rissler, Marie Bermeo, Harald Wallander, Hanna Karlsson, Linnea Kollberg, Mattia Scardamaglia, Robert Temperton, Suyun Zhu, Kajsa G. V. Sigfridsson Clauss, Christian Hulteberg, Andrey Shavorskiy, Lindsay Richard Merte, Maria Elise Messing, Johan Zetterberg, Sara Blomberg
Summary: Nickel-promoted molybdenum-based catalysts undergo oxidation-reduction reactions under high-pressure H-2 and elevated temperatures. The mixing of nickel and molybdenum lowers the reduction temperature of the oxide. The reduction process of the supported catalysts is more gradual compared to foils, indicating a strong interaction between the catalyst and the alumina support.
Article
Chemistry, Applied
Jorge Ramirez, Perla Castillo-Villalon, Aida Gutierrez-Alejandre, Alejandro Ayala, Oscar Cruz-Garduza, Monica Ayala, Patricia Quintana-Owen, Adolfo Romero-Galarza
Article
Chemistry, Applied
Ricardo H. Gil-Horan, Juan C. Chavarria-Hernandez, Patricia Quintana-Owen, Aida Gutierrez-Alejandre
TOPICS IN CATALYSIS
(2020)
Article
Chemistry, Physical
Viviana Palos-Barba, Cecilia Lugo-Nabor, Rodrigo R. Velazquez-Castillo, Dora Alicia Solis-Casados, Carmen L. Peza-Ledesma, Eric M. Rivera-Munoz, Rufino Nava, Barbara Pawelec
Article
Chemistry, Applied
Eduardo Santiago Vazquez, Julia Aguilar Pliego, Joaquin Perez Pariente, Manuel Sanchez Sanchez, Angel R. Arteaga Licona, Misael Garcia Ruiz, Dora Solis-Casados
Article
Chemistry, Applied
Edgar Tututi-Rios, Horacio Gonzalez, Denis A. Cabrera-Munguia, Aida Gutierrez-Alejandre, Jose L. Rico
Summary: Through the sol-gel method, Sn-SBA-15 catalysts modified with -PrSO3H groups were synthesized, which significantly improved the acid properties of the catalysts and increased the conversion rate of the esterification reaction between oleic acid and methanol.
Article
Chemistry, Applied
Jose Luis Sanchez-Cupil, Rogelio Cuevas-Garcia, Aida Gutierrez-Alejandre, Jorge Ramirez
Summary: Hydrotalcites with different Ni contents were synthesized and used as catalysts for the transesterification of castor oil. It was found that the addition of nickel increased the number of medium basic force sites, and the catalyst with Ni2Mg1-C ratio showed the highest activity and methanol adsorption. The relationship between methoxy ions and transesterification activity was established by analyzing the methanol adsorption behavior on the catalyst. A new mechanism for basic heterogeneous catalysis was proposed based on the existence of methoxy ions in solution when methanol was added to a calcined hydrotalcite and heated.
Article
Chemistry, Physical
Alfredo Lopez-Olvera, J. Gabriel Flores, Julia Aguilar-Pliego, Carl K. Brozek, Aida Gutierrez-Alejandre, Ilich A. Ibarra
Summary: The chemical transformation of H2S inside MOFs to generate polysulfides in situ is an exciting strategy for sequestration, with implications for sulfur battery electrodes. The unexpected MOF-catalyzed polysulfide formation involves mechanisms diverging radically from conventional coordination chemistry. The importance of dynamic metal-linker bonding in designing future MOF catalysts is highlighted.
CHEMISTRY OF MATERIALS
(2021)
Article
Electrochemistry
M. Castro-Gomez, A. Gutierrez-Alejandre, M. Aguilar-Franco, L. C. Ordonez
Summary: By characterizing and testing composite materials with different metal oxide contents, it was found that the incorporation of TiO2 and ZrO2 into the support can modify their electronic properties and increase the concentration of acid sites, which positively affects the activity of Pt catalysts. The Pt/C-Ti23 and Pt/C-Zr23 catalysts showed the highest electrocatalytic activity among the tested composites.
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2021)
Article
Chemistry, Applied
Perla Castillo-Villalon, Jorge Ramirez, Alejandro Reyes-Sosa, Aida Gutierrez-Alejandre, Eddy Leyva-Ramirez, Rogelio Cuevas, Alejandra Toledo-Duran
Summary: The study reveals the significant role of cobalt sulfide in hydrodesulfurization catalysis, emphasizing its importance in achieving highly active catalysts.
Article
Chemistry, Physical
Ireri Segura Gutierrez, Veronica Hernandez Morales, Eric Mauricio Rivera Munoz, Rufino Nava Mendoza, Ludwig Lagarde Soto, Carmen Leticia Peza Ledesma, Doris Solis Casados, Barbara Pawelec
Summary: In this study, novel adsorbents based on 3D hierarchical silica monoliths functionalized with thiol groups were used for the removal of Hg(II) ions from acidic aqueous solution. The results showed that the hierarchical macro-mesoporosity of the functionalized monoliths allowed for better accessibility of Hg(II) to thiol groups, resulting in higher removal efficiency under slightly acidic conditions.
Article
Chemistry, Physical
Maria Guadalupe Hernandez-Cruz, Dora Alicia Solis-Casados, Jose Antonio Toledo-Antonio, Jorge Roberto Vargas-Garcia, Miriam Estrada-Flores, Carlos Angeles-Chavez, Maria Antonia Cortes-Jacome, Cecilia Encarnacion-Gomez
Summary: Au nanoparticles supported on TiO2 nanotubes were synthesized by a novel vapor phase impregnation approach and their photocatalytic performance in the decoloration of malachite green dye was evaluated. Characterization techniques revealed that the Au nanoparticles exhibited high dispersion and electronic interaction with TiO2, resulting in a decreased band gap energy and surface plasmonic resonance. These findings provide important insights for the application of photocatalytic materials.
Review
Chemistry, Inorganic & Nuclear
Juan L. Obeso, Daniel R. Amaro, Catalina Flores, Aida Gutierrez-Alejandre, Ricardo A. Peralta, Carolina Leyva, Ilich A. Ibarra
Summary: Metal-Organic Frameworks (MOFs) are used in the adsorption and oxidation of H2S, with the potential to generate polysulfides for applications in lithium-sulfur batteries.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Dora Alicia Solis-Casados, Estefany Rodriguez-Nava, Rafael Basurto, Uvaldo Hernandez-Balderas, Tatiana Klimova, Luis Escobar-Alarcon
Summary: Boron-modified TiO2 thin films with different boron contents were prepared, and the XPS results showed the variation of boron content and the formation of Ti-O-B bonds. Raman spectra indicated that the incorporation of boron improved the crystallinity and decreased the crystallite size. Photoluminescence characterization revealed a suppression of electron-hole recombination rate due to boron incorporation. The photocatalytic activity of boron-modified films was enhanced under solar-simulated irradiation.
BULLETIN OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Inorganic & Nuclear
Israel T. Pulido-Diaz, Alejandro Serrano-Maldonado, Carlos Cesar Lopez-Suarez, Pedro A. Mendez-Ocampo, Benjamin Portales-Martinez, Aida Gutierrez-Alejandre, Karla P. Salas-Martin, Itzel Guerrero-Rios
Summary: The study demonstrates that nicotinamide groups grafted on ordered mesoporous silica (OMS) can serve as stabilizers for RhNPs used as catalysts, forming spherical rhodium nanoparticles with a narrow size distribution. On the contrary, amine-functionalized OMS tends to form RhNP aggregates after catalytic reactions, affecting the reaction efficiency. Supported RhNPs also exhibit selective reduction of different groups and show high activity in reductive amination reactions.
DALTON TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Sujing Wang, Liyu Chen, Mohammad Wahiduzzaman, Antoine Tissot, Lin Zhou, Ilich A. Ibarra, Aida Gutierrez-Alejandre, Ji Sun Lee, Jong-San Chang, Zheng Liu, Jerome Marrot, William Shepard, Guillaume Maurin, Qiang Xu, Christian Serre
Summary: Researchers have developed a robust mesoporous metal-organic framework, MIP-206, using a novel strategy to overcome limitations of previous mesoporous materials, showing excellent performance and potential for a wide range of applications.