Nickel catalysts supported on barium hexaaluminate for enhanced CO methanation

Jiajian Gao, Chunmiao Jia, Jing Li, Fangna Gu*, Guangwen Xu, Ziyi Zhong, Fabing Su

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

We report the preparation and characterization of Ni nanoparticles supported on barium hexaaluminate (BHA) as CO methanation catalysts for the production of synthetic natural gas (SNG). BHA with a high thermal stability was synthesized by a coprecipitation method using aluminum nitrate, barium nitrate, and ammonium carbonate as the precursors. The Ni catalysts supported on the BHA support (Ni/BHA) were prepared by an impregnation method. X-ray diffraction, nitrogen adsorption, transmission electron microscopy, thermogravimetric analysis, H 2 temperature-programmed reduction, O 2 temperature-programmed oxidation, NH 3 temperature-programmed desorption, and X-ray photoelectron spectroscopy are used to characterize the samples. The CO methanation reaction was carried out at pressures of 0.1 and 3.0 MPa, weight hourly space velocities (WHSVs) of 30-%000, 120-%000, and 240-%000 mL·g -1·h -1, with a H 2/CO feed ratio of 3, and in the temperature range 300-600 °C. The results show that although the BHA support has a relatively low surface area, Ni/BHA catalysts displayed much higher activity than Al 2O 3-supported Ni catalysts (Ni/Al 2O 3) with a similar level of NiO loading even after high temperature hydrothermal treatment. Nearly 100% CO conversion and 90% CH 4 yield were achieved over Ni/BHA (NiO, 10 wt %) at 400 °C, 3.0 MPa, and a WHSV of 30-%000 mL·g -1·h -1. Long time testing indicates that, compared to Ni/Al 2O 3 catalyst, Ni/BHA is more stable and is highly resistant to carbon deposition. The superior catalytic performance of the Ni/BHA catalyst is probably related to the relatively larger Ni particle size (20-40 nm), the high thermal stability of BHA support with nonacidic nature, and moderate Ni-BHA interaction. The work demonstrates BHA would be a promising alternative support for the efficient Ni catalysts to SNG production.

Original languageEnglish
Pages (from-to)10345-10353
Number of pages9
JournalIndustrial & Engineering Chemistry Research
Volume51
Issue number31
DOIs
StatePublished - 8 Aug 2012
Externally publishedYes

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