Citation: WANG Hui, ZHANG Jun-feng, BAI Yun-xing, WANG Wen-feng, TAN Yi-sheng, HAN Yi-zhuo. NiO@SiO₂ core-shell catalyst for low-temperature methanation of syngas in slurry reactor[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(5): 548-556. shu

NiO@SiO₂ core-shell catalyst for low-temperature methanation of syngas in slurry reactor

WANG Hui ^1,2 ,
ZHANG Jun-feng ^1,*,, ,
BAI Yun-xing ^1,2 ,
WANG Wen-feng ^1,2 ,
TAN Yi-sheng ¹ ,
HAN Yi-zhuo ¹

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: ZHANG Jun-feng, zhangjf@sxicc.ac.cn
Received Date: 25 December 2015
Revised Date: 29 February 2016

Figures(6)

A series of NiO@SiO₂ core-shell catalysts were prepared using modified Stöber-method. Their catalytic performances in methanation of syngas were investigated in slurry reactor at 320 ℃. The catalysts before and after reaction were characterized by XRD, TEM, XPS, N₂-physisorption, etc. It was found that the NiO@SiO₂ core-shell samples had well-shape morphologies and relatively uniform scale. The catalyst test revealed that the methanation activity of these catalysts decreased dramatically with increase of core particle size. The three catalysts with distinct size of core and shell showed remarkably rapid deactivation in the initial period of 20 h and then deactivated slowly during the following reaction, while their CH₄ selectivity maintained at about 80%. Void-shell was formed during the reaction probably because easy-migrated Ni (CO)_x species were generated. Apparently, it was concluded that increase of core particle size, decrease of BET surface area and pore volume, and abatement of mesopores within 3-5 nm in the shell were responsible for the deactivation of these core-shell catalysts based on the characterization of catalysts.
- core-shell,
- nickel-based catalyst,
- slurry reactor,
- low-temperature methanation
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

NiO@SiO2 core-shell catalyst for low-temperature methanation of syngas in slurry reactor

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通讯作者: 陈斌, bchen63@163.com

NiO@SiO₂ core-shell catalyst for low-temperature methanation of syngas in slurry reactor