Preparation of Mg-Al Mixed Oxide Supported Nickel Catalysts and Their Catalytic Activities in Low Temperature Reforming of Liquified Petroleum Gas

doi:10.3969/j.issn.0251-0790.2012.02.027

Abstract

Abstract: Ni/Mg(Al)O catalysts with different mass fractions of Ni were prepared by co-precipitation-impregnation method and used for low temperature steam reforming of liquified petroleum gas(LPG). X-ray diffraction and temperature-programmed reduction results showed that in the Ni/Mg(Al)O catalysts calcined at 800 ℃ Mg-Ni-O solid solution was formed, which could be reduced to produce metal Ni nanoparticles. The effects of Ni loading, reaction temperature and steam/carbon(n_H₂O/n_C) ratio on the catalytic performance were discussed in detail. The experimental results revealed that the 15%Ni/Mg(Al)O catalyst showed the optimal catalytic performance. Elevating reaction temperature could remarkably enhance the catalytic activity of the Ni/Mg(Al)O catalysts. In the temperature range of 400-500 ℃ and at n_H₂O/n_C=2, the highest space velo-city for completely converting LPG was enhanced from 28900 mL·h^-1·g^-1Cat to 86800 mL·h^-1·g^-1Cat. The proper increase in n_H₂O/n_C favored reforming of LPG to small gas molecules. However, excessive amount of steam led to the decrease in LPG conversion when LPG molar flow rate was kept constant. The XRD and TG analyses showed that the excellent catalytic activity and stability of the used Ni/Mg(Al)O catalyst could likely be due to highly stable Ni crystallites on the catalyst surface and good resistance to carbon deposition.

Key words: Nickel, Mg-Al mixed oxide, Liquified petroleum gas(LPG), Pre-reforming, Steam reforming

CLC Number:

O643.3

TrendMD:

SHEN Kui, WANG Xue-Guang, WANG Xin-Xing, ZOU Xiu-Jing, LU Xiong-Gang, DING Wei-Zhong. Preparation of Mg-Al Mixed Oxide Supported Nickel Catalysts and Their Catalytic Activities in Low Temperature Reforming of Liquified Petroleum Gas[J]. Chem. J. Chinese Universities, 2012, 33(02): 365.

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