Journal ArticleDOI
Tuning reverse water gas shift and methanation reactions during CO2 reduction on Ni catalysts via surface modification by MoOx
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In this paper, surface modification of Ni by MoOx can be tailored to tune the reactions of RWGS and methanation, and the results showed that the surface modification improves Ni dispersion through strong interactions whereas partially reduced MoOx modifies the surface of Ni particles through both geometric coverage and electronic modification.Abstract:
Catalytic reduction of CO2 to CO via reverse water gas shift (RWGS) reaction provides a feasible approach to utilize CO2, since CO can be further converted to various versatile products through the syngas routes. Ni-based catalysts are low cost and have a high activity for CO2 reduction but are nonselective for RWGS due to competition from methanation. In this work, we demonstrated that surface modification of Ni by MoOx can be tailored to tune the reactions of RWGS and methanation. The addition of MoOx improves Ni dispersion through strong interactions whereas partially reduced MoOx modifies the surface of Ni particles through both geometric coverage and electronic modification. No CO adsorption was observed at room temperature on the NiMo catalyst with a Mo/Ni ratio of 1, confirmed by density functional theory calculation. Tracking product evolution showed that CO2 is first reduced to CO through RWGS on the Ni catalysts and methane is a product of CO hydrogenation. Apparent activation energy analysis indicates that the overall reaction is controlled by CO desorption. Addition of a small amount of Mo (Mo/Ni ratio of 0.1) shifts the reaction further to methanation selective with ∼100% CH4 selectivity as MoOx aids in the activation of both CO2 and CO. In contrast, the addition of a large amount of Mo (Mo/Ni ratio of 1) shifts the reaction to RWGS selective with a CO selectivity > 94%. This is attributed to the enhanced CO desorption from the surface as a result of MoOx modification.read more
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Journal ArticleDOI
Progress in Regulating Electronic Structure Strategies on Cu-Based Bimetallic Catalysts for CO2 Reduction Reaction
Chunyang Yin,Qingwen Li,Jun Zheng,Yaqiong Ni,Huiqiong Wu,Anna-Lena Kjøniksen,Chuntai Liu,Yong Lei,Yi Zhang +8 more
TL;DR: In this paper , the influence of the electronic structure of materials on the catalytic performance of Cu-based bimetallic catalysts was analyzed, focusing on the application of four methods of Heterostructure Engineering, Alloy Engineering, Defect design Engineering and Surface modification Engineering.
Journal ArticleDOI
Determination of Kinetic Parameters for CO2 Methanation (Sabatier Reaction) over Ni/ZrO2 at a Stoichiometric Feed-Gas Composition under Elevated Pressure
Cheolyong Choi,Angkana Khuenpetch,Angkana Khuenpetch,Wei Zhang,Shoya Yasuda,Yixiong Lin,Hiroshi Machida,Hiroyuki Takano,K. Izumiya,Yoshiaki Kawajiri,Koyo Norinaga +10 more
TL;DR: Methanation of CO2 using H2 obtained by renewable energy sources has been gaining attention as one of the promising options for utilizing captured CO2 and surplus power obtained when intermittent p...
Journal ArticleDOI
Synergetic enhancement of activity and selectivity for reverse water gas shift reaction on Pt-Re/SiO2 catalysts
TL;DR: In this article , the reverse water gas shift (RWGS) reaction with renewable H2 to CO via co-impregnation was investigated and Pt-Re/SiO2 catalysts with varying amount of Re were tested for the RWGS reaction.
Journal ArticleDOI
Advanced zeolite and ordered mesoporous silica-based catalysts for the conversion of CO2 to chemicals and fuels.
Alexandra Velty,Avelino Corma +1 more
TL;DR: The use of catalysts constitutes an important tool in the development of sustainable chemistry, since catalysts increase the rate of the reaction without modifying the overall standard Gibbs energy in the reaction as mentioned in this paper .
Journal ArticleDOI
Support-induced modifications on the CO2 hydrogenation performance of Ni/CeO2: The effect of ZnO doping on CeO2 nanorods
Georgios Varvoutis,Stamatia A. Karakoulia,Marianna Lykaki,Sofia Stefa,Vassilios Binas,George E. Marnellos,Michalis Konsolakis +6 more
TL;DR: In this article , Ni-based catalysts supported on ZnO, CeO2 nanorods or a mixed ZnNO-CeO2 oxide were synthesized by a modified hydrothermal method and characterized by various physicochemical methods.
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