Article
Engineering, Chemical
Reihaneh Daroughegi, Fereshteh Meshkani, Mehran Rezaei
Summary: This article discusses the influence of four promoters (Zr, Ce, La, and Mo) on the structural properties and low temperature activity of Ni-Al2O3 catalyst in CO2 methanation reaction, with ceria having a positive effect on the catalytic performance. The addition of ceria favors the dispersion of NiO species, reduces Ni particle size, and increases metal-support interaction, leading to superior catalytic activity and stability. The 25wt.%Ni-5wt.%CeO2-Al2O3 catalyst achieved a maximum CO2 conversion of 76.4% and CH4 selectivity of 99.1% at 350 degrees C.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Environmental
Wen-Zhu Yu, Xin-Pu Fu, Kai Xu, Chen Ling, Wei-Wei Wang, Chun-Jiang Jia
Summary: The synergistic effect between Fe and Co in the Fe-Co/Al2O3 catalyst, along with the enhanced reducibility of metals and adsorption capacity for CO2 and H2, contributes to the superior catalytic performance in CO2 methanation under mild reaction conditions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Sebastian Weber, Ronny T. Zimmermann, Jens Bremer, Ken L. Abel, David Poppitz, Nils Prinz, Jan Ilsemann, Sven Wendholt, Qingxin Yang, Reihaneh Pashminehazar, Federico Monaco, Peter Cloetens, Xiaohui Huang, Christian Kuebel, Evgenii Kondratenko, Matthias Bauer, Marcus Baeumer, Mirijam Zobel, Roger Glaeser, Kai Sundmacher, Thomas L. Sheppard
Summary: There is a strong motivation in the catalysis community and chemical industry to integrate rational catalyst design and targeted chemical process optimization as the standard. This requires a cultural shift towards effective research data management. In this study, the challenges and importance of cooperation in digital catalysis research are highlighted through the comprehensive characterization of an industrial catalyst.
Article
Engineering, Environmental
Jitendra Kumar Prabhakar, Pankaj A. Apte, Goutam Deo
Summary: Replacing nickel with iron can promote CO2 methanation with supported nickel catalyst, which is often due to the presence of Ni-Fe alloy. However, the effect of replacing Ni with Fe on the rate expression of CO2 methanation and the specific causes leading to the promotion are not addressed. Through synthesis, characterization, and reaction studies, it is found that the presence of Ni-Fe alloy particles in the bimetallic catalysts increases the number of adsorption-sites and the fractional coverage of adsorbed CO2 and H2, resulting in enhanced CH4 formation rate.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Yiming Chen, Zhanggui Hou, Chuan Wang, Xin Ma, Hong Yang, Wen Wang, Ling Zhou, Yi Zhang
Summary: In this work, a high-loaded Ni/Al2O3 catalyst promoted by manganese was proposed. Among them, the 20Ni(2)Mn/Al2O3 catalyst showed the best CO2 conversion (90.5%) and excellent methanation stability at 250 degrees C. The addition of Mn greatly reduced the Ni particle size and improved the Ni dispersion on the alumina support, leading to better reducibility and more medium basic sites, which favor the adsorption and activation of CO2. Manganese could promote the rapid hydrogenation of monodentate carbonate to formate, which could be quickly converted to CH4, contributing to the significantly improved activity of the Mn promoted Ni/Al2O3 catalyst.
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
Energy & Fuels
Jiahui Yu, Bingge Feng, Shuai Liu, Xueliang Mu, Edward Lester, Tao Wu
Summary: In this study, a novel Ni/Al2O3-P catalyst was prepared and showed higher efficiency and better stability in CO2 methanation reaction.
Article
Chemistry, Physical
Hanh My Bui, Paula F. Grossmann, Tabea Gros, Merle Blum, Anne Berger, Richard Fischer, Normen Szesni, Markus Tonigold, Olaf Hinrichsen
Summary: This study successfully fabricated spherical Ni-Al CO2 methanation catalysts using the Binder Jetting 3D printing technique, with phase composition and reducibility characteristics similar to conventionally prepared catalysts. Catalysts with different nickel loadings were prepared by adjusting the Ni/Al ratio and the amount of admixed precursor powder. TEM analysis showed small nickel particle sizes and high Ni dispersion. Additionally, meso- and macroporous catalyst pellets with a high specific surface area were generated. Testing in a single pellet string reactor demonstrated high CO2 conversions and selectivity towards CH4.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Engineering, Environmental
Michel Obeid, Christophe Poupin, Madona Labaki, Samer Aouad, Francois Delattre, Sharad Gupta, Haingomalala Lucette Tidahy, Aida Younis, Ferdaous Ben Romdhane, Eric M. Gaigneaux, Josefine Schnee, Edmond Abi-Aad
Summary: NiMgAl and NiMgAlFe oxides were synthesized using co-precipitation and ultrasound-assisted co-precipitation methods for catalyzing CO2 methanation. MgAl and MgAlFe oxides-supported Ni materials prepared by the impregnation method served as references. The catalysts were characterized using various techniques, and the NiMgAl catalyst prepared by ultrasound-assisted co-precipitation exhibited the best activity with no deactivation for 40 hours. The superior performance was attributed to smaller particle size, higher specific surface area and pore volume, as well as better dispersion of nickel active species on the catalyst surface. In our study, the ultrasound method significantly reduced the synthesis time compared to traditional co-precipitation.
CHEMICAL ENGINEERING JOURNAL
(2023)
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
Biochemistry & Molecular Biology
Paulina Summa, Katarzyna Swirk, Dominik Wierzbicki, Monika Motak, Ivo Alxneit, Magnus Ronning, Patrick Da Costa
Summary: Promotion with V on Co-precipitated Ni-Mg-Al hydrotalcite-derived catalyst significantly alters textural properties and basicity, leading to improved dispersion of nickel and enhanced activity in CO2 methanation. An optimal loading of 2 wt% V shows the highest activity, correlating directly with specific surface area and basic properties of the catalysts.
Article
Energy & Fuels
Wenli Gao, Qiangfeng Yin, Xin Meng, Xuelian He, Zhong Xin
Summary: Confining active metal particles inside the channel of mesoporous support is an effective way to improve catalytic activity and stability, reducing metal usage and obtaining low metal content catalyst with scientific significance.
Article
Chemistry, Applied
Andrea Cardenas-Arenas, Helena Soriano Cortes, Esther Bailon-Garcia, Arantxa Davo-Quinonero, Dolores Lozano-Castello, Agustin Bueno-Lopez
Summary: The study of CO2 hydrogenation to CH4 revealed that the catalyst consisting of size-controlled NiO-CeO2 mixed oxide nanoparticles exhibits higher activity and selectivity, attributed to its high specific surface area and the presence of highly-reducible Ni-O-Ce species on the nanoparticle surface.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Zouhair Boukha, Alejandro Bermejo-Lopez, Benat Pereda-Ayo, Jose A. Gonzalez-Marcos, Juan R. Gonzalez-Velasco
Summary: The performance of nickel catalyst supported on lanthana-modified hydroxyapatite (HAP) in CO2 methanation was investigated, with La addition improving the dispersion and reducibility of Ni particles, increasing the amounts of basic sites and their thermal stability, leading to enhanced catalytic activity.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Energy & Fuels
Huilin Yi, Qiangqiang Xue, Shuliang Lu, Jiajia Wu, Yujun Wang, Guangsheng Luo
Summary: This study comprehensively investigates the role of pore structure on metal dispersion and catalytic performance. The results demonstrate that a narrow pore size distribution, high specific surface area, and large pore volume of the support promote uniform metal dispersion and stronger metal-support interaction. The Ni/Al2O3 microsphere catalysts exhibit smaller Ni particle size and higher CO2 conversion compared to other samples.
Article
Engineering, Chemical
Somaye Sadat Miri, Fereshteh Meshkani, Ali Rastegarpanah, Mehran Rezaei
Summary: The catalytic and structural properties of mesoporous nanocrystalline 10 wt.% Ni-MeOx-MgAl2O4 catalysts were investigated in dry reforming of methane. The addition of Ce significantly improved the catalytic performance, suppressing carbon deposition and enhancing CH4 conversion. The 3 wt.% Ce-promoted catalyst exhibited the best performance in terms of high CH4 conversion and low carbon deposition.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Thermodynamics
Mohammad Varbar, Seyed Mehdi Alavi-Amleshi, Mehran Rezaei, Ehsan Akbari
Summary: Methane catalytic oxidation was investigated over Ni/MgAl2O4 catalysts synthesized by a solid-state mechanochemical preparation method. The catalysts displayed high catalytic activity, with the increment in Ni loading improving CH4 conversion and CO2 selectivity. The study also found that increasing the O2:CH4 molar ratio and gas hourly space velocity enhanced CH4 conversion. However, a higher calcination temperature had a negative influence on the catalytic activity.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Mohammad Varbar, Seyed Mehdi Alavi, Mehran Rezaei, Ehsan Akbari
Summary: In this study, magnesium aluminate spinel was prepared as a catalyst support using a novel mechanochemical method. Co-promoted catalysts with 20% Ni were fabricated, with the 3%Co-20%Ni/MgAl2O4 catalyst showing optimal performance. Methane conversion rates of 50% and 90% were achieved at 530 and 600 degrees Celsius, respectively, indicating excellent catalytic activity.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Chemistry, Applied
Xiaofan Zhang, Yuxi Liu, Jiguang Deng, Lin Jing, Linke Wu, Hongxing Dai
Summary: In this work, PtPdx/ZrO2 catalysts were synthesized and characterized for methane oxidation. Among them, 0.44PtPd2.20/ZrO2 exhibited the best catalytic activity and sulfur resistance.
Article
Chemistry, Physical
Saba Kazemi, Seyed Mehdi Alavi, Mehran Rezaei
Summary: The study demonstrated that increasing the nickel content in NiO(x)/FeAl2O4 catalysts can enhance the catalytic activity, but excessive nickel loading may reduce the catalytic efficiency. The catalyst with 50% NiO showed excellent potential in the thermocatalytic decomposition of methane.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Ehsan Akbari, Seyed Mehdi Alavi, Mehran Rezaei, Afsanehsadat Larimi
Summary: This research investigates the effect of different promoters on the physicochemical features and catalytic activities of BaO-MnOx catalysts in the catalytic combustion of lean methane. The addition of CeO2 as a promoter shows superior catalytic performance, enhancing oxygen mobility and catalytic activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Parisa Shafiee, Seyed Mehdi Alavi, Mehran Rezaei
Summary: The effects of various alumina-supported Ni-Co catalysts on CO2 methanation were investigated. It was found that the addition of cobalt improved the dispersion of nickel particles in the catalyst but also resulted in a decrease in surface area and an increase in crystal size. The molar ratios of Ni/Co had a significant effect on the performance of the catalyst.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Chemistry, Physical
Seyed Mehdi Alavi, Mehran Rezaei, Mohammadreza Ahadzadeh, Ehsan Akbari
Summary: In this study, NiO(x)-MgO solid-solution catalysts were prepared by a simple mechanochemical route, and their textural characteristics and catalytic efficiency in CO2 reforming of propane were investigated. The results showed that the physicochemical properties and catalytic activity of the catalysts were influenced by the NiO content, and the NiO(25)-MgO catalyst exhibited the highest activity.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Physical
F. Barzegari, M. Rezaei, M. Kazemeini, F. Farhadi, A. R. Keshavarz
Summary: This study examines the performance of NiO-MgO-SiO2 catalysts with different promoter loadings in the propane dry reforming reaction. The addition of promoters enhances the metal-support interaction and basic characteristics of the catalysts. Ce-promoted catalyst exhibits the highest propane conversion, while La and Y-promoted catalysts show relatively poor performance. Ce-promoted catalysts demonstrate the best catalytic performance due to their sufficient active sites, high oxygen mobility, and appropriate acidic/basic characteristics. Zr-promoted catalyst shows the highest coke deposition, while Ce-promoted catalyst exhibits the lowest carbon formation. The optimal loading of ceria is suggested to be 3 wt. %.
MOLECULAR CATALYSIS
(2022)
Article
Energy & Fuels
F. Barzegari, M. Kazemeini, M. Rezaei, F. Farhadi, A. R. Keshavarz
Summary: In this study, a NiO-MgO-SiO2 catalyst was prepared and subjected to calcination at different temperatures for syngas production via propane dry reforming. Increasing the calcination temperature led to lower catalyst basicity, while the highest propane and CO2 conversions were achieved at 650 degrees C.
Article
Chemistry, Multidisciplinary
Maryam Mirasgari, Seyed Mehdi Alavi, Mehran Rezaei
Summary: This study investigated the effects of adding Mn and Co on the performance of catalysts. It was found that adding Mn improved the catalytic activity and thermal stability, while adding Co led to a slight decrease in performance.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Energy & Fuels
Farzad Jokar, Seyed Mehdi Alavi, Mehran Rezaei
Summary: This study investigates the effect of pore shape on the hydroisomerization of n-pentane by synthesizing composites with different pore structures. The results demonstrate that a well-developed micro/mesoporous structure with higher specific surface area improves the yield and conversion, while a better balance between acidic and metallic sites enhances the RON of the product stream.
Article
Chemistry, Physical
Mohammad Varbar, Seyed Mehdi Alavi, Mehran Rezaei, Ehsan Akbari
Summary: The textural features and catalytic efficiency of Mn-promoted Ni/MgAl2O4 catalysts were evaluated in the catalytic combustion of lean methane. The addition of manganese oxide improved the structural features and light-off temperatures, while the decrease in calcination temperature further increased the catalyst performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Hamid Pourdelan, Seyed Mehdi Alavi, Mehran Rezaei, Ehsan Akbari
Summary: NiO-MgO catalysts with different nickel loadings were synthesized and characterized. The 50wt.%NiO-MgO catalyst exhibited the best activity in the methane decomposition process. The addition of Cr2O3 improved the catalytic performance and lifetime of the catalyst.
Article
Energy & Fuels
Maryam Kaviani, Mehran Rezaei, Seyed Mehdi Alavi, Ehsan Akbari
Summary: In this study, Ni-SiO2@SiO2 core-shell catalysts were prepared and the effect of nickel content and calcination temperature on the catalytic activity was investigated. The results showed that Ni-SiO2@SiO2 catalyst with 10% Ni loading exhibited stable and high conversion rates of methane and CO2 with minimal carbon deposition. The high stability and carbon resistance properties of the catalyst were attributed to the strong Ni-SiO2 interaction and coverage of Ni particles by SiO2. The catalytic activity gradually improved with increasing calcination temperature.
