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Nanocatalysts for CO2 Utilization
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Nanocatalysts for CO2 Utilization

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 12062

Special Issue Editors

Prof. Dr. Guowu Zhan

E-Mail Website
Guest Editor
Integrated Nanocatalysts Institute (INCI), College of Chemical Engineering, Huaqiao University, 668 Jimei Avenue, Xiamen 361021, Fujian, China
Interests: CO2 hydrogenation; integrated nanocatalysts; MOFs
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Ning Wang

E-Mail Website
Guest Editor
Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
Interests: CO2 hydrogenation; C3H8 dehydrogenation; C1 catalysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

CO2 emission has been increasing due to the increasing global demand for energy consumption by the growing global population. Consequently, global warming has worsened over the years, inspiring researchers to explore possible methods for CO2 utilization to minimize net CO2 emissions. Over the years, many catalysts have been developed for CO2 utilization, and have been reported in increasing numbers of publications in this field. This Special Issue aims to include recent and emerging strategies to develop new and enhanced materials for CO2 activation and adsorption, and the catalytic reactions involving CO2 (including electrochemical, photochemical, and biological conversion of CO2), together with the integrated processes for CO2 conversion and reduction. The scope of this Special Issue will focus on recent advancements in the synthesis of catalyst materials for CO2 conversion into synthetic fuels, polymers, organic carbonates, and intermediate products. Both experimental and theoretical analyses are welcomed. In addition to full-length articles and short communications, we also welcome the submission of review papers by experts in this area for publication in this Special Issue.

We would like to invite interested researchers to submit their research work in this Special Issue on “Nanocatalysts for CO2 Utilization”, as this will be an excellent opportunity to be peer-reviewed by researchers with wide expertise in the field of catalysis, particularly on CO2 catalytic utilization systems.

Prof. Dr. Guowu Zhan
Prof. Dr. Ning Wang
Guest Editors

Manuscript Submission Information

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Keywords

  • CO2 utilization
  • bifunctional catalysts
  • nanomaterials
  • integrated processes

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Published Papers (4 papers)

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Research

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19 pages, 2980 KiB  
Article
Engineering the Quaternary Hydrotalcite-Derived Ce-Promoted Ni-Based Catalysts for Enhanced Low-Temperature CO2 Hydrogenation into Methane
by Yuxin Peng, Xin Xiao, Lei Song, Ning Wang and Wei Chu
Materials 2023, 16(13), 4642; https://doi.org/10.3390/ma16134642 - 27 Jun 2023
Viewed by 1399
Abstract
Ce-promoted NiMgAl mixed-oxide (NiCex-C, x = 0, 1, 5, 10) catalysts were prepared from the quaternary hydrotalcite precursors for CO2 hydrogenation to methane. By engineering the Ce contents, NiCe5-C showed its prior catalytic performance in low-temperature CO2 hydrogenation, being about three [...] Read more.
Ce-promoted NiMgAl mixed-oxide (NiCex-C, x = 0, 1, 5, 10) catalysts were prepared from the quaternary hydrotalcite precursors for CO2 hydrogenation to methane. By engineering the Ce contents, NiCe5-C showed its prior catalytic performance in low-temperature CO2 hydrogenation, being about three times higher than that of the Ce-free NiCe0-C catalyst (turnover frequency of NiCe5-C and NiCe0-C: 11.9 h−1 vs. 3.9 h−1 @ 225 °C). With extensive characterization, it was found that Ce dopants promoted the reduction of NiO by adjusting the interaction between Ni and Mg(Ce)AlOx support. The highest ratio of surface Ni0/(Ni2+ + Ni0) was obtained over NiCe5-C. Meanwhile, the surface basicity was tailored with Ce dopants. The strongest medium-strength basicity and highest capacity of CO2 adsorption was achieved on NiCe5-C with 5 wt.% Ce content. The TOF tests indicated a good correlation with medium-strength basicity over the NiCex-C samples. The results showed that the high medium-strength and Ce-promoted surface Ni0 species endows the enhanced low-temperature catalytic performance in CO2 hydrogenation to methane. Full article
(This article belongs to the Special Issue Nanocatalysts for CO2 Utilization)
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13 pages, 3761 KiB  
Article
Unveiling the Origin of Alkali Metal (Na, K, Rb, and Cs) Promotion in CO2 Dissociation over Mo2C Catalysts
by Renmin Liu, Congmei Chen, Wei Chu and Wenjing Sun
Materials 2022, 15(11), 3775; https://doi.org/10.3390/ma15113775 - 25 May 2022
Cited by 8 | Viewed by 2363
Abstract
Molybdenum carbide (Mo2C) is a promising and low-cost catalyst for the reverse water−gas shift (RWGS) reaction. Doping the Mo2C surface with alkali metals can improve the activity of CO2 conversion, but the effect of these metals on CO [...] Read more.
Molybdenum carbide (Mo2C) is a promising and low-cost catalyst for the reverse water−gas shift (RWGS) reaction. Doping the Mo2C surface with alkali metals can improve the activity of CO2 conversion, but the effect of these metals on CO2 conversion to CO remains poorly understood. In this study, the energies of CO2 dissociation and CO desorption on the Mo2C surface in the presence of different alkali metals (Na, K, Rb, and Cs) are calculated using density functional theory (DFT). Alkali metal doping results in increasing electron density on the Mo atoms and promotes the adsorption and activation of CO2 on Mo2C; the dissociation barrier of CO2 is decreased from 12.51 on Mo2C surfaces to 9.51–11.21 Kcal/mol on alkali metal-modified Mo2C surfaces. Energetic and electronic analyses reveal that although the alkali metals directly bond with oxygen atoms of the oxides, the reduction in the energy of CO2 dissociation can be attributed to the increased interaction between CO/O fragments and Mo in the transition states. The abilities of four alkali metals (Na, K, Rb, and Cs) to promote CO2 dissociation increase in the order Na (11.21 Kcal/mol) < Rb (10.54 Kcal/mol) < Cs (10.41 Kcal/mol) < K (9.51 Kcal/mol). Through electronic analysis, it is found that the increased electron density on the Mo atoms is a result of the alkali metal, and a greater negative charge on Mo results in a lower energy barrier for CO2 dissociation. Full article
(This article belongs to the Special Issue Nanocatalysts for CO2 Utilization)
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17 pages, 4288 KiB  
Article
Improving Anti-Coking Properties of Ni/Al2O3 Catalysts via Synergistic Effect of Metallic Nickel and Nickel Phosphides in Dry Methane Reforming
by Yu Shi, Shiwei Wang, Yiming Li, Fan Yang, Hongbo Yu, Yuting Chu, Tong Li and Hongfeng Yin
Materials 2022, 15(9), 3044; https://doi.org/10.3390/ma15093044 - 22 Apr 2022
Cited by 17 | Viewed by 2800
Abstract
A series of NiP-x/Al2O3 catalysts containing different ratio of metallic nickel to nickel phosphides, prepared by varying Ni/P molar ratio of 4, 3, 2 through a co-impregnation method, were employed to investigate the synergistic effect of metallic nickel-nickel phosphides in [...] Read more.
A series of NiP-x/Al2O3 catalysts containing different ratio of metallic nickel to nickel phosphides, prepared by varying Ni/P molar ratio of 4, 3, 2 through a co-impregnation method, were employed to investigate the synergistic effect of metallic nickel-nickel phosphides in dry methane reforming reaction. The Ni/Al2O3 catalyst indicates good activity along with severe carbon deposition. The presence of phosphorus increases nickel dispersion as well as the interaction between nickel and alumina support, which results in smaller nickel particles. The co-existence of metallic nickel and nickel phosphides species is confirmed at all the P contained catalysts. Due to the relative stronger CO2 dissociation ability, the NiP-x/Al2O3 catalysts indicate obvious higher resistance of carbon deposition. Furthermore, because of good balance between CH4 dissociation and CO2 dissociation, NiP-2/Al2O3 catalyst exhibits best resistance of carbon deposition, few carbon depositions were formed after 50 h of dry methane reforming. Full article
(This article belongs to the Special Issue Nanocatalysts for CO2 Utilization)
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Review

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22 pages, 5544 KiB  
Review
Recent Advances of Indium Oxide-Based Catalysts for CO2 Hydrogenation to Methanol: Experimental and Theoretical
by Dongren Cai, Yanmei Cai, Kok Bing Tan and Guowu Zhan
Materials 2023, 16(7), 2803; https://doi.org/10.3390/ma16072803 - 31 Mar 2023
Cited by 15 | Viewed by 4641
Abstract
Methanol synthesis from the hydrogenation of carbon dioxide (CO2) with green H2 has been proven as a promising method for CO2 utilization. Among the various catalysts, indium oxide (In2O3)-based catalysts received tremendous research interest due [...] Read more.
Methanol synthesis from the hydrogenation of carbon dioxide (CO2) with green H2 has been proven as a promising method for CO2 utilization. Among the various catalysts, indium oxide (In2O3)-based catalysts received tremendous research interest due to the excellent methanol selectivity with appreciable CO2 conversion. Herein, the recent experimental and theoretical studies on In2O3-based catalysts for thermochemical CO2 hydrogenation to methanol were systematically reviewed. It can be found that a variety of steps, such as the synthesis method and pretreatment conditions, were taken to promote the formation of oxygen vacancies on the In2O3 surface, which can inhibit side reactions to ensure the highly selective conversion of CO2 into methanol. The catalytic mechanism involving the formate pathway or carboxyl pathway over In2O3 was comprehensively explored by kinetic studies, in situ and ex situ characterizations, and density functional theory calculations, mostly demonstrating that the formate pathway was extremely significant for methanol production. Additionally, based on the cognition of the In2O3 active site and the reaction path of CO2 hydrogenation over In2O3, strategies were adopted to improve the catalytic performance, including (i) metal doping to enhance the adsorption and dissociation of hydrogen, improve the ability of hydrogen spillover, and form a special metal-In2O3 interface, and (ii) hybrid with other metal oxides to improve the dispersion of In2O3, enhance CO2 adsorption capacity, and stabilize the key intermediates. Lastly, some suggestions in future research were proposed to enhance the catalytic activity of In2O3-based catalysts for methanol production. The present review is helpful for researchers to have an explicit version of the research status of In2O3-based catalysts for CO2 hydrogenation to methanol and the design direction of next-generation catalysts. Full article
(This article belongs to the Special Issue Nanocatalysts for CO2 Utilization)
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