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Goto Y, Yamazaki K, Kikugawa M, Aoki M. Enhanced chemical looping CO 2 conversion activity and thermal stability of perovskite LaCo 1-xAl xO 3 by Al substitution. Dalton Trans 2024; 53:13847-13853. [PMID: 39120572 DOI: 10.1039/d4dt01743a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2024]
Abstract
The reverse water-gas shift chemical looping (RWGS-CL) process that utilizes redox reactions of metal oxides is promising for converting CO2 to CO at low temperatures. Metal oxides with perovskite structures, particularly, perovskite LaCoO3 are promising frameworks for designing RWGS-CL materials as they can often release oxygen atoms topotactically to form oxygen vacancies. In this study, solid solutions of perovskite LaCo1-xAlxO3 (0 ≤ x ≤ 1), which exhibited high CO production capability and thermal stability under the RWGS-CL process, were developed. Al-substituted LaCo0.5Al0.5O3 (x = 0.5) exhibited a 4.1 times higher CO production rate (2.97 × 10-4 CO mol g-1 min-1) than that of LaCoO3 (x = 0; 0.73 × 10-4 CO mol g-1 min-1). Diffuse reflectance infrared Fourier transform spectroscopy studies suggested that an increase in CO2 adsorption sites produced by the coexistence of Al and Co was responsible for the enhancement of CO production rate. Furthermore, LaCo0.5Al0.5O3 maintained its perovskite structure during the RWGS-CL process at 500 °C without significant decomposition, whereas LaCoO3 decomposed into La2O3 and Co0. In situ X-ray diffraction study revealed that the high thermal stability was attributed to the suppression of phase transition into a brownmillerite structure with ordered oxygen vacancies. These findings provide a critical design approach for the industrial application of perovskite oxides in the RWGS-CL processes.
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Affiliation(s)
- Yoshihiro Goto
- Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan.
| | - Kiyoshi Yamazaki
- Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan.
| | - Masashi Kikugawa
- Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan.
| | - Masakazu Aoki
- Toyota Central R&D Labs., Inc., 41-1 Yokomichi, Nagakute, Aichi 480-1192, Japan.
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Maeno Z, Koiso H, Shitori T, Hiraoka K, Seki S, Namiki N. Syngas Production by Chemical Looping Dry Reforming of Methane over Ni-modified MoO 3/ZrO 2. Chem Asian J 2024; 19:e202301096. [PMID: 38146061 DOI: 10.1002/asia.202301096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 12/24/2023] [Accepted: 12/25/2023] [Indexed: 12/27/2023]
Abstract
We investigated supported-MoO3 materials effective for the chemical looping dry reforming of methane (CL-DRM) to decrease the reaction temperature. Ni-modified molybdenum zirconia (Ni/MoO3/ZrO2) showed CL-DRM activity under isothermal reaction conditions of 650 °C, which was 100-200 °C lower than the previously reported oxide-based materials. Ni/MoO3/ZrO2 activity strongly depends on the MoO3 loading amount. The optimal loading amount was 9.0 wt.% (Ni/MoO3(9.0)/ZrO2), wherein two-dimensional polymolybdate species were dominantly formed. Increasing the loading amount to more than 12.0 wt.% resulted in a loss of activity owing to the formation of bulk Zr(MoO4)2 and/or MoO3. In situ Mo K-edge XANES studies revealed that the surface polymolybdate species serve as oxygen storage sites. The Mo6+ species were reduced to Mo4+ species by CH4 to produce CO and H2. The reduced Mo species reoxidized by CO2 with the concomitant formation of CO. The developed Ni/MoO3(9.0)/ZrO2 was applied to the long-term CL-DRM under high concentration conditions (20 % CH4 and 20 % CO2) at 650 °C, with two pathways possible for converting CH4 and CO2 to CO and H2 via the redox reaction of the Mo species and coke formation.
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Affiliation(s)
- Zen Maeno
- School of Advanced Engineering, Kogakuin University, 2665-1, Nakano-machi, 192-0015, Hachioji, Tokyo, Japan
| | - Hiroki Koiso
- School of Advanced Engineering, Kogakuin University, 2665-1, Nakano-machi, 192-0015, Hachioji, Tokyo, Japan
| | - Toshiki Shitori
- School of Advanced Engineering, Kogakuin University, 2665-1, Nakano-machi, 192-0015, Hachioji, Tokyo, Japan
| | - Koji Hiraoka
- School of Advanced Engineering, Kogakuin University, 2665-1, Nakano-machi, 192-0015, Hachioji, Tokyo, Japan
| | - Shiro Seki
- School of Advanced Engineering, Kogakuin University, 2665-1, Nakano-machi, 192-0015, Hachioji, Tokyo, Japan
| | - Norikazu Namiki
- School of Advanced Engineering, Kogakuin University, 2665-1, Nakano-machi, 192-0015, Hachioji, Tokyo, Japan
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Zhang W, Sun J, Wang H, Cui X. Recent Advances in Hydrogenation of CO 2 to CO with Heterogeneous Catalysts Through the RWGS Reaction. Chem Asian J 2024; 19:e202300971. [PMID: 38278764 DOI: 10.1002/asia.202300971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 01/22/2024] [Accepted: 01/22/2024] [Indexed: 01/28/2024]
Abstract
With the continuous increase in CO2 emissions, primarily from the combustion of coal and oil, the ecosystem faces a significant threat. Therefore, as an effective method to minimize the issue, the Reverse Water Gas Shift (RWGS) reaction which converts CO2 towards CO attracts much attention, is an environmentally-friendly method to mitigate climate change and lessen dependence on fossil fuels. Nevertheless, the inherent thermodynamic stability and kinetic inertness of CO2 is a big challenge under mild conditions. In addition, it remains another fundamental challenge in RWGS reaction owing to CO selectivity issue caused by CO2 further hydrogenation towards CH4 . Up till now, a series of catalysis systems have been developed for CO2 reduction reaction to produce CO. Herein, the research progress of the well-performed heterogeneous catalysts for the RWGS reaction were summarized, including the catalyst design, catalytic performance and reaction mechanism. This review will provide insights into efficient utilization of CO2 and promote the development of RWGS reaction.
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Affiliation(s)
- Wenting Zhang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, No. 18, Tianshui Middle Road, Lanzhou, 730000, People's Republic of China
- University of Chinese Academy of Sciences, No. 19A, Yuquanlu, Beijing, 100049, People's Republic of China
| | - Jiashu Sun
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, No. 18, Tianshui Middle Road, Lanzhou, 730000, People's Republic of China
- University of Chinese Academy of Sciences, No. 19A, Yuquanlu, Beijing, 100049, People's Republic of China
| | - Hongli Wang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, No. 18, Tianshui Middle Road, Lanzhou, 730000, People's Republic of China
| | - Xinjiang Cui
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences, No. 18, Tianshui Middle Road, Lanzhou, 730000, People's Republic of China
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Kang K, Kakihara S, Higo T, Sampei H, Saegusa K, Sekine Y. Equilibrium unconstrained low-temperature CO 2 conversion on doped gallium oxides by chemical looping. Chem Commun (Camb) 2023; 59:11061-11064. [PMID: 37650129 DOI: 10.1039/d3cc02399k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Reverse water gas shift (RWGS) can convert CO2 into CO by using renewable hydrogen. However, this important reaction is endothermic and equilibrium constrained, and thus traditionally performed at 900 K or higher temperatures using solid catalysts. In this work, we found that RWGS can be carried out at low temperatures without equilibrium constraints using a redox method called chemical looping (CL), which uses the reduction and oxidation of solid oxide surfaces. When using our developed MGa2Ox (M = Ni, Cu, Co) materials, the reaction can proceed with almost 100% CO2 conversion even at temperatures as low as 673 K. This allows RWGS to proceed without equilibrium constraints at low temperatures and greatly decreases the cost for the separation of unreacted CO2 and produced CO. Our novel gallium-based material is the first material that can achieve high conversion rates at low temperatures in reverse water gas shift using chemical looping (RWGS-CL). Ni outperformed Cu and Co as a dopant, and the redox mechanism of NiGa2Ox is a phase change due to the redox of Ga during the RWGS-CL process. This major finding is a big step forward for the effective utilization of CO2 in the future.
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Affiliation(s)
- Keke Kang
- Department of Applied Chemistry, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo, 169-8555, Japan.
| | - Sota Kakihara
- Department of Applied Chemistry, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo, 169-8555, Japan.
| | - Takuma Higo
- Department of Applied Chemistry, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo, 169-8555, Japan.
| | - Hiroshi Sampei
- Department of Applied Chemistry, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo, 169-8555, Japan.
| | - Koki Saegusa
- Department of Applied Chemistry, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo, 169-8555, Japan.
| | - Yasushi Sekine
- Department of Applied Chemistry, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo, 169-8555, Japan.
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Ince MC, Koybasi HH, Avci AK. Modeling of reverse water–gas shift reaction in a membrane integrated microreactor. Catal Today 2023. [DOI: 10.1016/j.cattod.2023.114130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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Shi H, Bhethanabotla VR, Kuhn JN. Pelletized SiO2-supported La0.5Ba0.5FeO3 for conversion of CO2 to CO by a reverse water-gas shift chemical looping process. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.10.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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