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Effects of Pressure and Temperature in Hydrothermal Preparation of MoS2 Catalyst for Methanation Reaction

Authors
Choi, Jae-MyeongKim, Sung-HyunLee, Seung-JaeKim, Seong-Soo
Issue Date
7월-2018
Publisher
SPRINGER
Keywords
MoS2; Hydrothermal reaction; Pressure; Temperature; Catalytic activity
Citation
CATALYSIS LETTERS, v.148, no.7, pp.1803 - 1814
Indexed
SCIE
SCOPUS
Journal Title
CATALYSIS LETTERS
Volume
148
Number
7
Start Page
1803
End Page
1814
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/74839
DOI
10.1007/s10562-018-2372-x
ISSN
1011-372X
Abstract
Unsupported MoS2 catalysts were prepared for the methanation reaction by varying the pressure and temperature in the hydrothermal reaction by using ammonium tetrathiomolybdate (ATTM). The physical and chemical characteristics of the catalysts were analyzed by using XRD, SEM, TEM, BET, XPS, H-2-TPR, and CO-TPD techniques. The catalyst particles were formed in the bent fringe shape by stacking the (0 0 2) planes, and consisted mostly of MoS2, with some Mo2S5 and MoS3. It was found that the BET surface and active sites such as surface Mo4+ and sulfur vacancies increased with increasing preparation pressure, which could contribute to the improvement of MoS2 catalytic activity. The increase in preparation temperature not only favored the decomposition of ATTM into MoS2, but also lowered the number of active sites accessible for the reaction. Thus, it was suggested that the preparation temperature should be controlled at 350 A degrees C to improve the catalytic activity. [GRAPHICS] .
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