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나노물질 및 화학반응 연구단
나노물질 및 화학반응 연구단
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Size-controlled model Ni catalysts on Ga2O3 for CO2 hydrogenation to methanol

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Title
Size-controlled model Ni catalysts on Ga2O3 for CO2 hydrogenation to methanol
Author(s)
Hanseul Choi; Sunyoung Oh; Si Bui Trung Tran; Jeong Young Park
Publication Date
2019-08
Journal
JOURNAL OF CATALYSIS, v.376, no., pp.68 - 76
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Abstract
© 2019 Elsevier Inc.The effect of particle size for Ni nanoparticles supported on β-Ga2O3 was investigated for CO2 hydrogenation to methanol at 0.5 MPa. Model Ni nanoparticles ranging from 3.3 to 10.2 nm were synthesized using the hot injection method by controlling the reaction temperature and time. The smallest Ni nanoparticles (3.3 nm) showed the highest catalytic activity across the entire temperature range and the largest Ni nanoparticles (10.2 nm) showed the highest methanol selectivity. The apparent activation energies for methanol with Ni nanoparticles increased from 6.0 to 18.4 kcal mol−1 as the nanoparticle size increased. Furthermore, it was found that the smallest Ni nanoparticles favor the reverse water gas shift reaction. In situ DRIFT analysis revealed that the gallium oxide itself could produce an intermediate species and the addition of Ni on the oxide support increases the hydrogenation rate. The Ni supported catalysts showed a CO peak, but the smallest Ni nanoparticles showed a larger CO peak than that for the largest Ni nanoparticles, which clearly supports that the smaller nanoparticles favor the reverse water gas shift reaction
URI
https://pr.ibs.re.kr/handle/8788114/6290
ISSN
0021-9517
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > Journal Papers (저널논문)
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Journal of Catalysis 376 (2019) 68–76.pdfDownload

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