Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (02): 350-358.doi: 10.3866/PKU.WHXB20100212

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Hydrogen Production fromCoke Oven Gas byMethane Reforming: Thermodynamic Analysis and Experimental Study

YANG Zhi-Bin, ZHANG Yu-Wen, ZHANG Yun-Yan, DING Wei-Zhong, SHEN Pei-Jun, LIU Yong, ZHOU Yu-Ding, HUANG Shao-Qing   

  1. Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai 200072, P. R. China
  • Received:2009-05-05 Revised:2009-11-24 Published:2010-01-26
  • Contact: DING Wei-Zhong E-mail:wzhding@shu.edu.cn

Abstract:

A thermodynamic analysis of the partial oxidation of methane (POM) in coke oven gas (COG) was carried out. The optimized conditions were CH4/O2 molar ratios of 1.7-2.1 and reaction temperatures of 825-900 ℃. We obtained CH4 conversions of 91.0%-99.9%, H2 selectivity of 87.0%-93.4%, and CO selectivity of 100%-107% at 1.01×105 Pa. The effect of H2 in the COG on the performance of POM was also investigated between 825 and 900 ℃. The optimized volume ratio of steam addition was 2%-4% and the molar ratio of CH4/O2 was 2 at 1.01×105 Pa and 825-900 ℃. A maximum conversion rate of 98.6%was achieved for CH4 using COG, while the maximum selectivities of H2 and CO were 96.4% and 107%, respectively. The amount of hydrogen obtained after reforming was doubled despite a thermal consumption of only 2.94 J·mol -1 for the COG. The performance of a NiO/MgO solid solution catalyst packed on a BaCo0.7Fe0.2Nb0.1O3-啄(BCFNO) membrane reactor was also investigated for the POMin COG. The reforming process was successfully performed. At 875 ℃, 95% CH4 conversion, 80.5% H2 selectivity, and 106% CO selectivity at an oxygen permeation flux of 16.3 mL·cm-2·min -1 were achieved. The results for POM reforming in COG on the membrane reactor were consistent with the thermodynamic analysis. The NiO/MgO solid solution catalyst, therefore, has good activity and is suitable for application in hydrogen production.

Key words: Coke oven gas, Hydrogen, Thermodynamic analysis, Mixed-conducting membrane reactor, NiO/MgO solid solution catalyst

MSC2000: 

  • O641