Article
Chemistry, Physical
Gustavo do N. Franceschini, Patricia Concepcion, Marcio Schwaab, Maria do Carmo Rangel, Joaquin Martinez-Triguero, Jose M. Lopez Nieto
Summary: The dehydrogenation of ethane with CO2 on CrOx/Al2O3 catalysts was studied, and the role of CO2 was investigated by comparing with ethane dehydrogenation without CO2. The characterization of the catalyst showed an intimate interaction between Cr and the support. In situ Raman spectroscopic analysis and oS studies revealed that the reaction conditions (presence/absence of CO2, and reaction temperature) influenced the nature of active Cr species and the reaction mechanism. At lower temperatures, CO2 promoted the oxidative dehydrogenation route, while at higher temperatures, the reaction occurred through catalytic dehydrogenation with partial inhibition of coke formation by CO2.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Chemistry, Physical
Jun Luo, Ao Wang, Lichao Jia, Dong Yan, Mei Hu, Jian Li
Summary: A series of 13 wt % Cr-x wt % Ce-α-Al2O3 catalysts were prepared and evaluated for ethane dehydrogenation to ethylene. The catalyst with 5 wt % Ce demonstrated the highest dehydrogenation activity and better regeneration ability.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Energy & Fuels
Haoyue Fu, Weixin Qian, Haitao Zhang, Hongfang Ma, Weiyong Ying
Summary: Unmodified Cr/Al2O3 and Cr/Al2O3 doped with different alkali metals (Li, Na, K) were prepared using the incipient wetness impregnation method. The surface elements of all catalysts were evenly distributed and well loaded, and the addition of alkali metals did not alter the crystal structure and surface texture. Both Cr6+ and Cr3+ species were present on all catalysts, and the addition of alkali metals increased the amount of Cr6+ species, which were mainly converted into active Cr3+ species during the reaction, thereby enhancing the initial propane conversion. The addition of alkali metals reduced the total acid sites and strong acid sites of the catalyst, inhibiting side reactions and carbon deposition, and reducing catalyst deactivation. Cr-0.5Na/Al2O3 exhibited the best catalytic performance and the lowest carbon deposition.
Article
Chemistry, Physical
Jun Luo, Ao Wang, Lichao Jia, Dong Yan, Mei Hu, Jian Li
Summary: This study investigates the improvement of commercial catalysts for the dehydrogenation of light alkanes to olefins. It is found that adding 5 wt % Ce to the 13 wt % Cr-gamma-Al2O3 catalyst results in the highest dehydrogenation activity and better regeneration ability.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Tianyu Wan, Fang Jin, Xiaojie Cheng, Jianhong Gong, Chaoyin Wang, Guiying Wu, Aoli Liu
Summary: This study prepared zeolite-based catalysts with different structures and compositions using various methods. It was found that Cr(VI) is active in the oxidative dehydrogenation of ethane, and the presence of hydroxyl groups has a crucial impact on the activity and stability of the catalyst.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Wijnand Marquart, Shaine Raseale, Michael Claeys, Nico Fischer
Summary: The CO2 oxidative dehydrogenation reaction has the potential to play a role in CO2-utilizing catalytic reactions. Transition metal carbides, especially MoxCy, are promising catalysts for this reaction. The addition of promoters can significantly influence the crystal structure and acid-base characteristics of the carbide system, leading to enhanced activity, stability, and selectivity of the catalyst.
Article
Engineering, Chemical
Weiqi Chen, Maximilian Cohen, Kewei Yu, Hsuan-Lan Wang, Weiqing Zheng, Dionisios G. Vlachos
Summary: The study investigates the kinetics of ethane dehydrogenation over a Ga2O3/Al2O3 catalyst with and without CO2 and H2O, utilizing Bayesian inference to assess rate parameters' statistical confidence. Both CO2 and H2O enhance catalyst stability through coke gasification mechanism.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Fatima Jalid, Tuhin Suvra Khan, M. Ali Haider
Summary: By employing first principles theoretical analysis and microkinetic modelling, bimetallic alloy catalysts of cobalt, palladium, and copper have been designed for CO2 assisted ethane dehydrogenation reaction. Through in silico simulations, certain alloy catalysts have been identified that can maintain high ethane and CO2 conversion rates, increase ethylene yield, and reduce coke formation, making them potential candidates for experimental testing and scale-up studies.
Review
Materials Science, Multidisciplinary
Zhenhua Xie, Lea R. Winter, Jingguang G. Chen
Summary: This review highlights the significance of bimetallic-derived catalysts in upgrading CO2 and ethane, focusing on synthesis, characterization, and application aspects. It also discusses the challenges and opportunities in designing and developing multifunctional catalysts for further upgrading CO2 and shale gas.
Article
Chemistry, Physical
Jing Xu, Zonghui Liu, Yali Zhou, Rui Fu, Zhe Wen, Bing Yan, Bing Xue
Summary: The oxidation of biomass-derived alkyl lactate to alkyl pyruvate using VxOy/SBA-15 catalysts was studied. It was found that the conversion of ethyl lactate increased with the increase of vanadium loading, while the selectivity to ethyl pyruvate remained above 95%. The catalysts were characterized and their structure-activity relationships were analyzed, and a possible catalytic mechanism was proposed.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Sudipta De, Samy Ould-Chikh, Antonio Aguilar, Jean-Louis Hazemann, Andrea Zitolo, Adrian Ramirez, Selvedin Telalovic, Jorge Gascon
Summary: This study reports a Cr-based catalyst for efficient ethane dehydrogenation to ethylene at low temperatures, with good stability and regeneration properties. Detailed analysis shows that using all-silica MFI zeolite as a support promotes the stability of the Cr catalyst, enhancing its coke resistance.
Article
Chemistry, Physical
Jing Xu, Zonghui Liu, Yali Zhou, Rui Fu, Zhe Wen, Bing Yan, Bing Xue
Summary: The oxidation of biomass-derived alkyl lactate to alkyl pyruvate over a solid catalyst is studied. VxOy/SBA-15 catalysts with varying vanadium loading are prepared and characterized. The EL conversion increases with the increase of vanadium loading, while the selectivity to EP remains high. The structure-activity relationships and catalytic mechanism are analyzed.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Plaifa Hongmanorom, Jangam Ashok, Guanghui Zhang, Zhoufeng Bian, Ming Hui Wai, Yiqing Zeng, Shibo Xi, Armando Borgna, Sibudjing Kawi
Summary: Ni and Ni-Mg phyllosilicate mesoporous SBA-15 catalysts prepared via ammonia evaporation (AE) method exhibit superior catalytic performance in CO2 methanation compared to catalysts prepared via wetness impregnation (WI) method, due to enhanced metal-support interaction and weakly basic sites provided by surface hydroxyl groups. Incorporation of Mg into phyllosilicate structure increases medium basic sites, promoting monodentate formate formation and improving CO2 methanation activity. Additionally, the turnover frequency of CO2 conversion is correlated with the concentration of basic sites, and the strong metal-support interaction and confinement effect of SBA-15 can suppress metal sintering, ensuring good stability.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Rui Tang, Niamat Ullah, Zhenhua Li
Summary: Introducing promoters on Ni-based catalysts has been proven to enhance their performance in CO2 methanation. The correlation between the promotion mechanism and the reaction pathway is significant for designing efficient catalysts. In this study, Zr-promoted SBA-15 supported Ni catalysts were prepared, and it was found that the addition of citric acid improved CH4 selectivity and the presence of Zr species on the support activated CO2. The ZrNi-1.7(CI) catalyst showed excellent catalytic performance with high CO2 conversion and CH4 selectivity, as well as good stability without carbon deposits after 50 hours of testing.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Stavros A. Theofanidis, G. T. Kasun Kalhara Gunasooriya, Ioanna Itskou, Maria Tasioula, Angeliki A. Lemonidou
Summary: The study reveals the potential of using iron oxide as a catalyst support for the on-purpose ethylene production through CO2-assisted oxidative dehydrogenation of ethane. The selectivity of the catalyst towards C-H bond cleavage can be controlled by adjusting the Ni/Fe ratio. Fine-tuning the Ni/Fe molar ratio leads to stable catalytic performance with improved selectivity towards ethylene and ethane conversion.
