Article
Energy & Fuels
Maria Mikhail, Patrick Da Costa, Jacques Amouroux, Simeon Cavadias, Michael Tatoulian, Stephanie Ognier, Maria Elena Galvez
Summary: In this study, the effects of alkali metal (Na and K) on the physicochemical and catalytic behavior of Ni/CeZrOx catalysts during non-thermal plasma-assisted CO2 methanation were investigated. The presence of Na and K impurities resulted in decreased CO2 conversions, lower selectivity to CH4 and increased power consumption. The interaction with both the support and the active phase led to a more difficult reduction of the Ce-species, affecting the overall catalytic performance. Higher dielectric constant contributed to increased energy dissipation and favored the strong ionization of the gas contained in the reactor gap, resulting in CO formation.
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
Wojciech Gac, Witold Zawadzki, Marcin Kusmierz, Grzegorz Slowik, Wojciech Grudzinski
Summary: Two series of catalysts containing different amounts of neodymium were prepared by the impregnation method, using nano-CeO2 and gamma-Al2O3 as supports. Ceria supported nickel catalysts showed high activity in CO2 methanation reaction and weak activity changes were observed with an increase in Nd content. Complex changes in the nature of their redox and base centres were indicated by various characterizations.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Viktoria Golovanova, Maria Chiara Spadaro, Jordi Arbiol, Viacheslav Golovanov, Tapio T. Rantala, Teresa Andreu, Joan Ramon Morante
Summary: The study utilizes solar light harvesting in the thermocatalytic approach to carbon dioxide methanation, revealing a dual effect of incident photons on the catalytic properties of the Ni/CeO2 catalyst. The approach increases the reaction rate up to 2.4 times and decreases power consumption by 20% under solar illumination, replacing conventional thermal activation with a green energy source.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Tiancheng Pu, Jiacheng Chen, Weifeng Tu, Jing Xu, Yi-Fan Han, Israel E. Wachs, Minghui Zhu
Summary: In this study, the strong metal-support interaction (SMSI) phenomenon for supported Ni/CeO2 catalysts with different CeO2 nanomorphologies was systematically explored. The degree of encapsulation of Ni particles originating from the SMSI effect was found to be positively correlated with the CO2 hydrogenation activity. Quasi in situ XPS and in situ DRIFTS techniques were used to reveal the relevant species and reaction pathways. These findings provide a fundamental strategy for tailoring catalytic performance by adjusting the support surface structure.
JOURNAL OF CATALYSIS
(2022)
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
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
Chemistry, Physical
Ayesha A. Alkhoori, Omer Elmutasim, Aasif A. Dabbawala, Michalis A. Vasiliades, Klito C. Petallidou, Abdul-Hamid Emwas, Dalaver H. Anjum, Nirpendra Singh, Mark A. Baker, Nikolaos D. Charisiou, Maria A. Goula, Angelos M. Efstathiou, Kyriaki Polychronopoulou
Summary: In this study, the Ni/CeO2/Al2O3 catalyst system was investigated to understand how different synthesis parameters affect interfacial phenomena and CO2 methanation. Key factors such as alumina texture, ceria loading, and synthesis method of supported Ni were examined to determine their influence on catalyst activity and CH4 selectivity. Among the studied catalysts, Ni-20Ce/mpAl showed promising results with high CO2 conversion rate (70%) and CH4 selectivity (>94%) at 350°C. The researchers found that medium- and high-porosity alumina facilitated better dispersion of ceria, while Ni-CeO2 cogrowth resulted in small Ni crystallites that increased in size over the course of the reaction. This catalyst exhibited advantageous features for CO2 methanation, including a high concentration of oxygen vacancies, significant presence of surface Ce3+ species, and strong CO activation capability.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Maria Mikhail, Patrick Da Costa, Jacques Amouroux, Simeon Cavadias, Michael Tatoulian, Maria Elena Galvez, Stephanie Ognier
Summary: The study examined the effects of different promoters on Ni/CeZrOx catalysts in NTP-assisted CO2 methanation, where the addition of 4% Gd promoter significantly increased energy efficiency with 85% conversion of CO2 to methane achieved. This enhancement was attributed to electrical and physicochemical properties, including a low dielectric constant, high metal dispersion, high percentage of medium basic sites, and appropriate promoter's cation radii.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
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
Chemistry, Physical
Ning Rui, Xiaoshan Zhang, Feng Zhang, Zongyuan Liu, Xinxiang Cao, Zhenhua Xie, Rui Zou, Sanjaya D. Senanayake, Yanhui Yang, Jose A. Rodriguez, Chang-Jun Liu
Summary: The Ni/CeO2 catalyst prepared via gas discharge plasma and hydrogen reduction shows high activity in CO2 methanation at low temperatures, with excellent CH4 formation rate and redox property. The unique interfacial structure and metal-support interaction lead to the formation of rich interfacial Ni-CeO2 sites, improving the catalyst's performance significantly in H-2 splitting and CO2 activation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Amar Bendieb Aberkane, Maria Pilar Yeste, Faycal Djazi, Miguel Angel Cauqui
Summary: In this study, a series of NiO-CeO2 mixed-oxide catalysts were prepared using a modified co-precipitation method. The influence of the preparation method and pH value on the properties of the catalysts were investigated. The catalyst prepared at a higher pH value exhibited better performance in the CO methanation reaction.
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)
