Preparation of high-surface-area Ni/α-Al2O3 catalysts for improved CO methanation

Youjun Liu, Jiajian Gao, Qing Liu, Fangna Gu*, Xiaopeng Lu, Lihua Jia, Guangwen Xu, Ziyi Zhong, Fabing Su

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We have developed a simple approach for the preparation of α-Al2O3 with a high surface area (AH) (about 44 m2 g-1) through deposition-precipitation of aluminum nitrate on a carbon black hard template. The AH support was impregnated with a Ni precursor to obtain the Ni/α-Al2O3 catalyst (Ni/AH-I). The above catalyst preparation method was further simplified by one-pot co-precipitation of the nickel and aluminum precursors on the carbon template to obtain the AH-supported Ni catalyst (Ni/AH-C). The samples were characterized by nitrogen adsorption, X-ray diffraction, transmission electron microscopy, thermogravimetric analysis, H2 temperature-programmed reduction and H2 temperature-programmed desorption. The catalytic test results showed that the both Ni/AH-I and Ni/AH-C catalysts exhibited much more enhanced catalytic performance in syngas methanation than a Ni catalyst supported on low-surface-area α-Al2O3 at both atmospheric and high pressures, and at a weight hourly space velocity (WHSV) of 30 000 mL g-1 h-1, as well as a good stability in a 50 h high-pressure stability test at an extremely high WHSV of 120 000 mL g-1 h-1. The test of accelerated aging indicated that Ni/AH-C showed both better hydrothermal stability and stronger resistance to sintering. This work demonstrates AH can be prepared with high feasibility using carbon black as the hard template, and is suitable as a Ni catalyst support for CO methanation.

Original languageEnglish
Pages (from-to)7539-7546
Number of pages8
JournalRSC Advances
Volume5
Issue number10
DOIs
StatePublished - 2015
Externally publishedYes

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