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
Materials Science, Multidisciplinary
Yongfeng Li, Jiaojiao Su, Feng Yu, Xiaoliang Yan, Dahai Pan, Ruifeng Li, Yongxing Yang
Summary: The Co-containing catalysts supported on super-microporous Al2O3-ZrO2 with different Al/Zr molar ratios showed that the catalytic performance was highly influenced by the textural and chemical properties. Among them, the 2.5Co/AZ(0.7) catalyst with intermediate acidity, high surface area, and high metal dispersion exhibited the best performance in the dehydrogenation of ethylbenzene with CO2.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Chemical
Guowei Wang, Ning Tang, Ze Li, Xiaolin Zhu, Huanling Zhang, Shan Zhang, Honghong Shan
Summary: The Fe2O3 promoted TiO2-ZrO2 catalyst showed excellent dehydrogenation performance without the need for excessive superheated steam, which can reduce operation costs and improve stability. Additionally, a conceptual fluidized-bed ethylbenzene dehydrogenation process was proposed to achieve continuous reaction-regeneration operation, demonstrating a potential for reducing costs and achieving self-heat balance.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2021)
Article
Engineering, Environmental
Abrar Hussain, Kuen-Song Lin, Ndumiso Vukile Mdlovu, Hong-Paul Wang
Summary: Tungsten-zirconia (WOx/ZrO2) catalysts were synthesized and combined with CuO-ZnO-ZrO2 catalyst for methanol synthesis of dimethyl ether (DME) through direct hydrogenation of CO2. The calcination temperature of the WOx/ZrO2 catalysts greatly influenced their physicochemical properties. Characterization using various techniques revealed that the best performance was achieved with WOx/ZrO2 catalyst calcined at 800 degrees C. The combination of CuO/ZnO/ZrO2 and WOx/ZrO2 catalysts at 800 degrees C provided the highest DME selectivity, yield, and CO2 conversion.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Oana Grad, Angela M. Kasza, Alexandru Turza, Monica Dan, Lucian Barbu-Tudoran, Mihaela D. Lazar, Maria Mihet
Summary: This study presents a novel and feasible method to obtain Ni catalysts for CO2 methanation using sacrificial MIL-53(Al). The sacrificial MIL-53(Al) was obtained through a less time and energy-consuming hydrothermal synthesis, without compromising its structural and textural properties. The subsequent Ni catalysts derived from MIL-53(Al) exhibited an ordered mesoporous structure, uniform distribution of Ni nanoparticles, and enhanced H2 and CO2 adsorption capacity compared to the reference catalyst (Ni/Al-(com)).
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Chemistry, Applied
Ole Havik Bjorkedal, Samuel Konrad Regli, Rob Jeremiah G. Nuguid, Per Erik Vullum, Oliver Krocher, Davide Ferri, Magnus Ronning
Summary: Catalysts composed of highly dispersed copper on a mesoporous ZrO2 support were synthesized using a one-pot sol-gel method and tested for the selective catalytic reduction of NOx by NH3. The presence of copper was found to enhance NH3 adsorption capacity, leading to efficient NOx conversion at low temperatures. Additionally, increasing the copper loading while maintaining dispersion improved the overall performance of the catalysts.
Article
Chemistry, Inorganic & Nuclear
Meng Gu, Dong Liu, Tao Ding, Xiaokang Liu, Tao Chen, Xinyi Shen, Tao Yao
Summary: Decorating Au nanoparticles onto ZrO2 improved the photocatalytic performance, achieving efficient and stable reduction of CO2 into CO and CH4 under simulated solar light. The enhanced visible-light absorption of Au/ZrO2, caused by localized surface plasmon resonance (LSPR), led to more efficient charge transport and electron-hole separation in the heterojunctions.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
Fernando Morales Anzures, Pastora Salinas Hernandez, Gilberto Mondragon Galicia, Albina Gutierrez Martinez, Francisco Tzompantzi Morales, Mario A. Romero Romo, Raul Perez Hernandez
Summary: The study found that different ZrO2 contents have different effects on the catalytic activity of the mixed oxide supports. For example, 5 wt% of ZrO2 in the catalyst led to an increase in medium strength basic sites and specific surface area, resulting in the best performance in DRM.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Xueya Dai, Tianlong Cao, Xingyu Lu, Yunli Bai, Wei Qi
Summary: A dual-path dehydrogenation route was developed to convert ethylbenzene to styrene efficiently using a Pd/hollow nanocarbon spheres catalyst. The catalyst exhibited high activity and selectivity, providing a rational design strategy for efficient alkane dehydrogenation reactions.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Energy & Fuels
K. V. Vikanova, A. L. Kustov, E. A. Makhov, O. P. Tkachenko, G. I. Kapustin, K. B. Kalmykov, I. V. Mishin, V. D. Nissenbaum, S. F. Dunaev, L. M. Kustov
Summary: The study shows that Re-containing catalysts synthesized based on two types of superacid oxide supports exhibit significant differences in their textural and chemical properties. Re2O7/SZ catalyst shows high selectivity towards CO conversion rate of over 94%, while Re-contained catalysts based on WZ support produce a large amount of methane.
Article
Engineering, Environmental
Emad N. Al-Shafei, D. Robert Brown, Sai P. Katikaneni, Hassan Aljama, Hameed H. Al-Badairy
Summary: This study investigated the direct conversion of CO2 with methane using a selective catalyst, with ZrO2/TiO2 based catalyst showing promising results. Different techniques were used to characterize the catalyst and it was found that a Langmuir-Hinshelwood mechanism best explained the reaction mechanism. The presence of carbon dioxide resulted in the production of more acetic acid, indicating a more favorable process compared to the dimerization reaction.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Chenglong Li, Zhitao Han, Yuqing Hu, Tingjun Liu, Xinxiang Pan
Summary: In this study, a series of tungsten-zirconium mixed binary oxides were synthesized as supports for Ce-0.4/WmZrOx catalysts. The promoting effect of W doping on the SCR performance of Ce-0.4/ZrO2 catalysts was investigated. The results showed that proper W doping significantly enhanced the catalytic performance and SO2 tolerance of Ce-0.4/ZrO2 catalysts.
Article
Chemistry, Physical
Jie Ren, Feng Zeng, Chalachew Mebrahtu, Regina Palkovits
Summary: This study investigates the effect of impurities on the activity of Ni/ZrO2 in CO2 methanation. It reveals that reducible ZrO2 promotes the formation of oxygen vacancies, enhancing CO2 adsorption and hydrogenation into methane. Interestingly, trace O-2 enhances CO2 methanation by generating more *OH groups, facilitating the conversion of intermediates to methane.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Multidisciplinary
Zhiying Liu, Yulin Li, Xiaohui Sun, Zhuyin Sui, Xiufeng Xu
Summary: This study explored the feasibility of coupling N2O decomposition with ethylbenzene oxidative dehydrogenation and found that the K/Co2AlO4 catalyst could achieve complete N2O decomposition with improved EB conversion and styrene selectivity. The modified catalysts showed enhanced performance due to improved reducibility, reduced acid properties, and electron transfer from K cation to Co species.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Engineering, Environmental
Xiaohui Sun, Zhiying Liu, Yulin Li, Kezhi Tang, Jian Wang, Zhuyin Sui, Xiufeng Xu
Summary: Mesoporous Cr-mAl2O3 and Ce-Cr-mAl2O3 catalysts were prepared via a one-pot hydrothermal process for N2O-assisted ethylbenzene selective oxidation to styrene. The Cr-doped catalysts, particularly 7Cr-mAl2O3, exhibited superior catalytic performance, and the addition of Ce further increased the styrene yield to 54%. In-situ DRIFTS characterization revealed the favorable reducibility of the catalyst, the role of Ce-Cr species in reducing the stability of carbon deposition, and the possible reaction pathway involving N2O and ethylbenzene.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(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.