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, Physical
Shuisen He, Tingting Huang, Yu Fan
Summary: Novel alumina-supported Ni-Mo catalysts for hydrodesulfurization were prepared via assembly method induced by tetradecylamine, which improved Mo dispersion and Ni modification, and promoted the formation of NiMoS phases.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Chemistry, Applied
Qiang Wei, Wenbin Huang, Xiaodong Liu, Anqi Li, Pengfei Zhang, Zhusong Xu, Zhiqing Yu, Xiaohan Wang, Haoran Liu, Yasong Zhou
Summary: A series of Re modified NiMo/Al2O3 hydrodesulfurization (HDS) catalysts with different contents of Re2O7 were synthesized using stepwise impregnation and co-impregnation methods. The effects of Re modification and impregnation methods on the catalysts' physical-chemical properties were characterized. The results revealed that Re modification improved the crystal morphologies, pore structures, and acid sites of the catalysts. Furthermore, the HDS evaluation showed that Re modification effectively enhanced the conversions, route selectivity, and even selectivity towards 3,3'-DMCHB of 4,6DMDBT, with the stepwise impregnation method exhibiting a more significant effect compared to co-impregnation.
Article
Nanoscience & Nanotechnology
Jixing Liu, Jingyi Zhu, Jie Zhu, Jundong Xu, Hui Liu, Mingqing Hua, Huifang Cheng, Huaming Li, Jian Liu, Wenshuai Zhu, Hongbing Ji
Summary: A hierarchical NiMo/Al2O3 catalyst was successfully fabricated using a 3D printing strategy, which significantly improved the hydrodesulfurization activity in the petrochemical industry.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Energy & Fuels
Ji-Xing Liu, Xiang-Qi Liu, Ri-Xin Yan, Ling-Feng Jia, Hui-Fang Cheng, Hui Liu, Yan Huang, Ming-Qing Hua, Hua-Ming Li, Wen-Shuai Zhu
Summary: In this study, a mesoporous LaAlOx catalyst was designed and constructed through a solvent evaporation-induced self-assembly method. The structure and physicochemical properties of the NiMo supported catalyst were characterized, and its catalytic activity for hydrodesulfurization (HDS) was investigated. The incorporation of La was found to significantly enhance the generation of Type II NiMoS phase, leading to improved HDS performance by promoting sulfidation and modifying the morphology of Ni promoted MoS2 slabs. This finding contributes to the understanding of structure-activity relationships in ultra-deep desulfurization and inspires the development of highly-efficient HDS catalysts in the future.
Article
Engineering, Chemical
Changzhen Wang, Chengyan Jiang, Juan Bai, Gaoju Yang, Ruifang Wu, Yongxiang Zhao, Tiancun Xiao
Summary: The mesoporous structures of Ni/Al2O3-SiO2 catalysts have significant effects on the hydrogenation performance of 1,4-butynediol to 1,4-butanediol. The cross pore structure enhances dispersion of active sites and exposure of acid sites, leading to improved hydrogenation ability. Conversely, the narrow and long parallel pore structure limits accessibility of active sites, while catalysts without mesoporous structures suffer from poor interaction between nickel particles and the support surface.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Tiebin Liu, Peiliang Sun, Huihong Zhu, Tao Yang, Bingtao Tang, Chong Peng
Summary: Two NiMo/Al2O3 catalysts with different acid-base properties were prepared and their effects on FCC diesel hydrotreating and desulfurization performance were investigated. The results showed that the surface structural differences affected the interaction between metals and oxygen atoms, leading to differences in catalytic activity. The catalyst with more active phases exhibited better desulfurization and denitrification performance, while the catalyst with higher sulfidation degree showed better hydrotreating performance. The findings provide insights for improving the performance of catalysts used in refinery processes.
Article
Engineering, Chemical
Zhanglong Guo, Hua Xu, Yanfei Wang, Wei Liu, Hao Yu, Jun Lin, Yuefeng Liu
Summary: This study investigated the relationship between the structure and catalytic performance of sulfurized NiMo/Al2O3 catalysts using advanced technologies, such as HAADF-STEM and XPS. The results showed that catalysts with small MoS2 stack length and many MoS2 stack layers tend to have high activity, and catalysts with a higher S/Mo ratio exhibit higher activity in the reaction.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Yanzeng Dong, Xiaohang Yu, Zhiheng Wang, Xin Li, Yanyan Liu, Ruiyao Gao, Songdong Yao
Summary: The effects of HY addition on the NiMoS active phase in NiMo(NH3) impregnated NiMo/Al2O3-HY catalyst and its role in 4,6-dimethyl-dibenzothiophene hydrodesulfurization were investigated. The results demonstrate that HY can enhance the HDS reaction by altering the morphology of NiMoS nanoclusters, even without involving the isomerization of 4,6-DMDBT. In the absence of strong acid sites, the turnover frequency (TOF) of the NiMo/Al2O3 catalyst was still improved by 90%.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Ke Yu, Weimin Kong, Zhen Zhao, Aijun Duan, Lian Kong, Xilong Wang
Summary: Mesoporous yolk-shell silica spheres with different shell thicknesses and yolk sizes were synthesized and used as catalyst supports for hydrodesulfurization reactions. The results showed that the shell thickness and yolk size significantly affect the catalytic activity, with the NiMo/Al-Y30S13 catalyst exhibiting the highest activity. Additionally, the mechanisms of DBT and 4,6-DMDBT HDS over NiMo/Al-YxSy materials were proposed.
JOURNAL OF CATALYSIS
(2022)
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
Materials Science, Multidisciplinary
M. Gonzalez-Ildelfonso, J. Escobar, E. Gordillo-Cruz, P. del Angel, V. A. Suarez-Toriello, J. A. De los Reyes
Summary: In this study, researchers successfully achieved deep removal of refractory dibenzothiophene using catalysts supported on Al2O3 with noble metal modification. Calcined catalysts showed better catalytic activity, while Ru-doped catalysts were detrimental to catalytic activity when not calcined before activation.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Environmental
Guangheng Wang, Zegao Zhao, Wenwu Zhou, Zhiping Chen, Anning Zhou, Yating Zhang, Xingyu Yang, Fei Yao
Summary: Binary TiO2-Al2O3 serial composites and NiMo supported catalysts were synthesized and characterized, demonstrating the significant influence of solvent evaporation temperature on the properties and performance of the catalysts.
CHEMICAL ENGINEERING JOURNAL ADVANCES
(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, Physical
Ludek Kaluza, Karel Soukup, Martin Kostejn, Jindrich Karban, Radostina Palcheva, Marek Laube, Daniela Gulkova
Summary: The effects of different supports on the performance of NiMo sulfide catalysts were investigated. It was found that acidic mesoporous SiO2-Al2O3 exhibited higher activity, while activated carbon support showed outstanding stability.
Article
Chemistry, Applied
R. Cuevas-Garcia, J. G. Tellez-Romero, J. Ramirez, P. Sarabia-Banuelos, I. Puente-Lee, C. Salcedo-Luna, S. Hernandez-Gonzalez, V. A. Nolasco-Arizmendi
Summary: The three nickel catalysts supported on mordenite zeolite with the same nickel content of 2 wt.% were prepared using different methods and showed diverse selectivity and activity in naphthalene hydrogenation reactions, with the Ni-DP catalyst displaying the highest hydrogenation activity and relatively slow deactivation rate.
Article
Chemistry, Applied
Ricardo H. Gil-Horan, Juan C. Chavarria-Hernandez, Patricia Quintana-Owen, Aida Gutierrez-Alejandre
TOPICS IN CATALYSIS
(2020)
Article
Energy & Fuels
Oscar D. Gonzalez-Galvez, Isaac Nava Bravo, Rogelio Cuevas-Garcia, Sharon B. Velasquez-Orta, Adam P. Harvey, Luis Cedeno Caero, Maria Teresa Orta Ledesma
Summary: In this study, a wild microalgae consortium grown in treated wastewater was used to produce bio-oil through catalytic solvent liquefaction process. The optimal reaction conditions were found to be at 120 minutes and 760 psi, resulting in a bio-oil yield of 51% with oxygenated and nitrogenated compounds as the main types of compounds.
BIOMASS CONVERSION AND BIOREFINERY
(2021)
Article
Energy & Fuels
G. Alonso-Ramirez, R. Cuevas-Garcia, F. Sanchez-Minero, Jorge Ramirez, M. Moreno-Montiel, G. Silva-Oliver, Jorge Ancheyta, R. Carbajal-Vielman
Summary: In this study, catalytic hydrocracking of isolated aromatics fraction from heavy crude oil was conducted using sulfided Mo/gamma-Al2O3 catalyst. The main components in the feedstock were identified as multi-ring aromatics, with the primary reactions transforming them into saturates and lower molecular weight aromatics. No coke formation was detected, with gas and liquid phase products analyzed using GC-MSD and GC-FID techniques.
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
Thermodynamics
I Nava-Bravo, S. B. Velasquez-Orta, I Monje-Ramirez, L. P. Guereca, A. P. Harvey, R. Cuevas-Garcia, I Yanez-Noguez, M. T. Orta-Ledesma
Summary: The study found that the use of ozone-air flotation and catalytic HTL for microalgae harvesting and conversion can achieve higher yields and quality of bio-crude compared to traditional sedimentation method.
ENERGY CONVERSION AND MANAGEMENT
(2021)
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
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.
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.