Effect of Ni Precipitation Method on CO Methanation over Ni/TiO2 Catalysts

doi:10.1007/s40242-018-7205-3

Chemical Research in Chinese Universities ›› 2018, Vol. 34 ›› Issue (2): 296-301.doi: 10.1007/s40242-018-7205-3

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Effect of Ni Precipitation Method on CO Methanation over Ni/TiO₂ Catalysts

YIN Shi, ZHU Lingjun, LIU Yincong, WANG Xiaoliu, LIU Yingying, WANG Shurong

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China

Received:2017-06-12 Revised:2017-10-13 Online:2018-04-01 Published:2017-12-04
Contact: ZHU Lingjun,E-mail:srwang@zju.edu.cn;WANG Shurong,E-mail:lingjun_zhu@zju.edu.cn E-mail:srwang@zju.edu.cn;lingjun_zhu@zju.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.51661145011), the National Science and Technology Supporting Plan, China(No.2015BAD15B06), the Foundation of the State Key Laboratory of Clean Energy Utilization, China(No. ZJUCEU2016001).

Abstract

Abstract: A Ni/TiO₂(TBT) catalyst was prepared through in situ precipitation, using tetrabutyl titanate(TBT) as the TiO₂ precursor, and was studied in CO methanation. A Ni catalyst supported on commercial TiO₂ was also prepared through post precipitation and studied to compare the influence of Ni precipitation conditions on the catalyst's performance. To gain insight on their structure and physicochemical properties, the catalysts were characterized with N₂-adsorption, X-ray diffraction, transimission electron microscopy, H₂ temperature programmed reduction and temperature programmed desorption. The results showed that the in situ precipitation method was beneficial to the dispersion of Ni and the formation of more active sites on the Ni/TiO₂ catalyst. In addition, the density of the metal-support boundary and its interaction with the active component were also increased. These characteristics of Ni/TiO₂(TBT) led to a lower light-off temperature and a suppression of Ni sintering during CO methanation. As a consequence, the Ni/TiO₂(TBT) exhibited better catalytic behavior, with a CO conversion of 99.4% and CH₄ selecti-vity of 90.4% under the following conditions:p=1 MPa, t=320℃, n(H₂)/n(CO)=3, gas hour space velocity (GHSV)=2×10⁴ mL·g^-1·h^-1. The life test results of the two catalysts showed that Ni/TiO₂(TBT) was more stable and the catalytic activity remained at its initial level after being used for 30 h.

Key words: Methanation, Ni/TiO₂, Precipitation method, Tetrabutyl titanate, Metal-support interactions

YIN Shi, ZHU Lingjun, LIU Yincong, WANG Xiaoliu, LIU Yingying, WANG Shurong. Effect of Ni Precipitation Method on CO Methanation over Ni/TiO₂ Catalysts[J]. Chemical Research in Chinese Universities, 2018, 34(2): 296-301.

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Effect of Ni Precipitation Method on CO Methanation over Ni/TiO₂ Catalysts

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