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Aimdate K, Srifa A, Koo-amornpattana W, Sakdaronnarong C, Klysubun W, Kiatphuengporn S, Assabumrungrat S, Wongsakulphasatch S, Kaveevivitchai W, Sudoh M, Watanabe R, Fukuhara C, Ratchahat S. Natural Kaolin-Based Ni Catalysts for CO 2 Methanation: On the Effect of Ce Enhancement and Microwave-Assisted Hydrothermal Synthesis. ACS OMEGA 2021; 6:13779-13794. [PMID: 34095670 PMCID: PMC8173562 DOI: 10.1021/acsomega.1c01231] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Accepted: 05/05/2021] [Indexed: 05/16/2023]
Abstract
Natural kaolin-based Ni catalysts have been developed for low-temperature CO2 methanation. The catalysts were prepared via a one-step co-impregnation of Ni and Ce onto a natural kaolin-derived metakaolin using a microwave-assisted hydrothermal method as an acid-/base-free synthesis method. The influences of microwave irradiation and Ce promotion on the catalytic enhancement including the CO2 conversion, CH4 selectivity, and CH4 yield were experimentally investigated by a catalytic test of as-prepared catalysts in a fixed-bed tubular reactor. The relationship between the catalyst properties and its methanation activities was revealed by various characterization techniques including X-ray fluorescence, X-ray diffraction, Brunauer-Emmett-Teller, scanning electron microscopy, selected area electron diffraction, transmission electron microscopy, elemental mapping, H2 temperature-programmed reduction, and X-ray absorption near-edge structure analyses. Among the two enhancement methods, microwave and Ce promotion, the microwave-assisted synthesis could produce a catalyst containing highly dispersed Ni particles with a smaller Ni crystallite size and higher catalyst reducibility, resulting in a higher CO2 conversion from 1.6 to 7.5% and a better CH4 selectivity from 76.3 to 79.9% at 300 °C. Meanwhile, the enhancement by Ce addition exhibited a great improvement on the catalyst activities. It was experimentally found that the CO2 conversion increased approximately 7-fold from 7.5 to 52.9%, while the CH4 selectivity significantly improved from 79.9 to 98.0% at 300 °C. Though the microwave-assisted synthesis could further improve the catalyst activities of Ce-promoted catalysts, the Ce addition exhibited a more prominent impact than the microwave enhancement. Cerium oxide (CeO2) improved the catalyst activities through mechanisms of higher CO2 adsorption capacity with its basic sites and the unique structure of CeO2 with a reversible valence change of Ce4+ and Ce3+ and high oxygen vacancies. However, it was found that the catalyst prepared by microwave-assisted synthesis and Ce promotion proved to be the optimum catalyst in this study. Therefore, the present work demonstrated the potential to synthesize a nickel-based catalyst with improved catalytic activities by adding a small amount of Ce as a catalytic promoter and employing microwave irradiation for improving the Ni dispersion.
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Affiliation(s)
- Kritchakorn Aimdate
- Department
of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon
Pathom 73170, Thailand
| | - Atthapon Srifa
- Department
of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon
Pathom 73170, Thailand
| | - Wanida Koo-amornpattana
- Department
of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon
Pathom 73170, Thailand
| | - Chularat Sakdaronnarong
- Department
of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon
Pathom 73170, Thailand
| | - Wantana Klysubun
- Synchrotron
Light Research Institute, Nakhon Ratchasima 30000, Thailand
| | - Sirapassorn Kiatphuengporn
- National
Nanotechnology Center (NANOTEC), National Science and Technology Development
Agency, Pathum Thani 12120, Thailand
| | - Suttichai Assabumrungrat
- Center
of Excellence in Catalysis and Catalytic Reaction Engineering, Department
of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand
- Bio-Circular-Green-Economy
Technology & Engineering Center, BCGeTEC, Department of Chemical
Engineering, Faculty of Engineering, Chulalongkorn
University, Bangkok 10330, Thailand
| | - Suwimol Wongsakulphasatch
- Department
of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
| | - Watchareeya Kaveevivitchai
- Department
of Chemical Engineering, National Cheng
Kung University, Tainan
City 70101, Taiwan
- Hierarchical
Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University, Tainan City 70101, Taiwan
| | - Masao Sudoh
- Amano
Institute of Technology, Hamamatsu, Shizuoka 431-1305, Japan
- Department
of Applied Chemistry and Biochemical Engineering, Graduate School
of Engineering, Shizuoka University, Hamamatsu, Shizuoka 432-8561, Japan
| | - Ryo Watanabe
- Department
of Applied Chemistry and Biochemical Engineering, Graduate School
of Engineering, Shizuoka University, Hamamatsu, Shizuoka 432-8561, Japan
| | - Choji Fukuhara
- Department
of Applied Chemistry and Biochemical Engineering, Graduate School
of Engineering, Shizuoka University, Hamamatsu, Shizuoka 432-8561, Japan
| | - Sakhon Ratchahat
- Department
of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon
Pathom 73170, Thailand
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