TY - JOUR
T1 - CO methanation on ordered mesoporous Ni-Cr-Al catalysts
T2 - Effects of the catalyst structure and Cr promoter on the catalytic properties
AU - Liu, Qing
AU - Zhong, Ziyi
AU - Gu, Fangna
AU - Wang, Xiaoyan
AU - Lu, Xiaopeng
AU - Li, Huifang
AU - Xu, Guangwen
AU - Su, Fabing
N1 - Publisher Copyright:
© 2016 Elsevier Inc. All rights reserved.
PY - 2016/5/1
Y1 - 2016/5/1
N2 - CO methanation is the main route in industry to produce synthetic natural gas (SNG), and the conventional Ni-based catalysts for this reaction often deactivate severely because of sintering of the Ni particles and coke formation on them. To overcome these technical barriers, we designed and synthesized a group of ternary Ni-Cr-Al metal oxide composites with ordered mesoporous structure and various Cr and Ni contents via a one-pot evaporation-induced self-assembly strategy and tested them for CO methanation to produce SNG. The support and the catalysts before and after the catalytic reaction were thoroughly characterized. It was found that, after reduction at 700 °C, metallic Ni particles were generated and anchored in the ordered mesoporous alumina channels while the Cr species started to surround the metallic Ni particles. The long-range ordered mesoporous structure could be maintained well when the total loading of nickel and chromium oxides was below 22 wt.%. In general, the optimized ordered mesoporous Ni-Cr-Al catalysts show much better anti-coking and anti-sintering properties and much higher catalytic activity and stability than the conventional Ni catalysts. The improved catalytic performance is attributed to the reduced Ni particle size, the confinement effect of the mesoporous materials, and the promoting effect of Cr, which can significantly reduce the Ni particle size and increase the H2 uptake. These findings shed light on the design of ordered mesoporous alumina-supported materials with high loading of active metal oxides for many high-temperature reactions.
AB - CO methanation is the main route in industry to produce synthetic natural gas (SNG), and the conventional Ni-based catalysts for this reaction often deactivate severely because of sintering of the Ni particles and coke formation on them. To overcome these technical barriers, we designed and synthesized a group of ternary Ni-Cr-Al metal oxide composites with ordered mesoporous structure and various Cr and Ni contents via a one-pot evaporation-induced self-assembly strategy and tested them for CO methanation to produce SNG. The support and the catalysts before and after the catalytic reaction were thoroughly characterized. It was found that, after reduction at 700 °C, metallic Ni particles were generated and anchored in the ordered mesoporous alumina channels while the Cr species started to surround the metallic Ni particles. The long-range ordered mesoporous structure could be maintained well when the total loading of nickel and chromium oxides was below 22 wt.%. In general, the optimized ordered mesoporous Ni-Cr-Al catalysts show much better anti-coking and anti-sintering properties and much higher catalytic activity and stability than the conventional Ni catalysts. The improved catalytic performance is attributed to the reduced Ni particle size, the confinement effect of the mesoporous materials, and the promoting effect of Cr, which can significantly reduce the Ni particle size and increase the H2 uptake. These findings shed light on the design of ordered mesoporous alumina-supported materials with high loading of active metal oxides for many high-temperature reactions.
KW - CO methanation
KW - Ni-Cr-Al catalyst
KW - Ordered mesoporous material
KW - Stability
UR - http://www.scopus.com/inward/record.url?scp=84961647370&partnerID=8YFLogxK
U2 - 10.1016/j.jcat.2016.01.023
DO - 10.1016/j.jcat.2016.01.023
M3 - 文章
AN - SCOPUS:84961647370
SN - 0021-9517
VL - 337
SP - 221
EP - 232
JO - Journal of Catalysis
JF - Journal of Catalysis
ER -