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CO and CO2 methanation over M (M[dbnd]Mn, Ce, Zr, Mg, K, Zn, or V)-promoted Ni/Al@Al2O3 catalysts
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Publication Year
2020-05-15
Journal
Catalysis Today
Publisher
Elsevier B.V.
Citation
Catalysis Today, Vol.348, pp.80-88
Keyword
Al@Al2O3CeCO methanationCO2 methanationMnNiPromoterγ-Al2O3
Mesh Keyword
Carbonate speciesCo methanationHydrogenation processN2 physisorptionPromoterPromotional effectSitu diffuse reflectance infrared Fourier transform spectroscopyTemperature-programmed reduction
All Science Classification Codes (ASJC)
CatalysisChemistry (all)
Abstract
Effects of metal promoter on CO and CO2 methanation were examined over Ni-M (M = Mn, Ce, Zr, Mg, K, Zn, or V)/Al@Al2O3 catalysts prepared by the co-impregnation method. Ni-M (M = Mn, Ce, or Zr)/γ-Al2O3 catalysts were also investigated for comparison. The prepared catalysts were characterized with a variety of techniques such as N2 physisorption, CO2 chemisorption, H2 chemisorption, temperature-programmed reduction with H2 (H2-TPR), temperature-programmed desorption of CO2 (CO2-TPD), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), and in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Among different promoters, Mn, Ce, Mg, V, and Zr are beneficial to enhance both CO and CO2 methanation activity due to the improvement of the Ni dispersion. The Ni-V/Al@Al2O3 catalyst performs the highest CO methanation activity due to the largest Ni sites. However, it is not the best one for CO2 methanation among tested catalysts because of the much decrease in CO2 adsorption capacity. The promotional effect of Mn is the most remarkable for both CO and CO2 methanation. On the other hand, the negative effect of K and Zn was observed on both CO and CO2 methanation by the small number of active Ni sites and the decrease in the amount of basic sites. The CO2 methanation mechanism over Ni-Mn/Al@Al2O3 catalyst is elucidated by the transform route: adsorbed carbonate species – formate species – methane under hydrogenation process.
ISSN
0920-5861
Language
eng
URI
https://aurora.ajou.ac.kr/handle/2018.oak/30933
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85072635337&origin=inward
DOI
https://doi.org/2-s2.0-85072635337
Journal URL
http://www.sciencedirect.com/science/journal/09205861
Type
Article
Funding
This work was supported by the Human Resources Program in Energy Technology (No. 20154010200820 ) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) , which is granted financial resources from the Ministry of Trade, Industry, and Energy of the Republic of Korea . This work was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT ( 2017R1A2B3011316 ).
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PARK, EUN DUCK Image
PARK, EUN DUCK박은덕
Department of Chemical Engineering
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