Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (9): 1841.

• Articles • Previous Articles     Next Articles

Catalytic Conversion of 1-Methylnaphthalene as Tar Model Compound from Hot Coke Oven Gas over Ni/MgO/Al2O3 Catalysts

YANG Jun , WANG Xue-Guang*, LI Lin, SHEN Kui, LU Xiong-Gang, DING Wei-Zhong*   

  1. Shanghai Key Laboratory of Modern Metallurgy and Material Processing, Shanghai University, Shanghai 200072, China
  • Received:2010-01-21 Online:2010-09-10 Published:2010-09-10
  • Contact: WANG Xue-Guang. E-mail: wxg228@shu.edu.cn; DING Wei-Zhong. E-mail: wzhding@public7.sta.net.cn
  • Supported by:

    国家“八六三”计划项目(批准号: 2006AA11A189)、上海市科学技术委员会重点项目(批准号: 07DZ12036)、上海市浦江人才计划(批准号: 08PJ1405900)和国家教育部留学回国人员科研启动资金资助.

Abstract: A series of Ni/MgO/Al2O3 catalysts were prepared by the method of co-impregnating boehmite(AlOOH) and characterized using N2 adsorption and X-ray diffraction(XRD). 1-Methylnaphthalene was selected as a tar compound to investigate the performance of the Ni/MgO/Al2O3 catalysts for converting tar from hot coke oven gas(COG) with a low water to carbon molar ratio(nH2O/nC) into light fuel gases. The effects of MgO content and operating conditions were examined at 775 ℃ and nH2O/nC=0.7. The experimental results showed that the MgO modified Ni/MgO/Al2O3 catalysts possessed excellent catalytic activity and stability for the conversion of 1-methylnaphthalene to small gas molecules. TG analysis of the used catalysts showed that addition of MgO in the Ni/MgO/Al2O3 catalysts could significantly enhance resistance to carbon deposition. It was first found that the presence of higher concentration of H2S(0.25%, volume fraction) could promote the conversion of tar to small gas molecules over the Ni/MgO/Al2O3 catalysts. This might be because the reversible adsorption of H2S on the surface of metallic Ni led to the formation of ensemble of Ni sites more suitable for steam reforming and, meanwhile, inhibited dissolution and diffusion of carbon in metal Ni from dissociative adsorption of hydrocarbon, leading to the formation of coke disposition on the catalyst.

Key words: Ni catalyst, 1-Methylnaphthalene, Coke oven gas, Tar, Catalytic conversion

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