Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (12): 2165-2171.doi: 10.3866/PKU.WHXB20081204

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Effect of a Mg Promoter on the Structure and Catalytic Performance of a Co/Mg/HZSM-5 Catalyst for the Partial Oxidation of Methane to Syngas

ZHANG Nuo-Wei, HUANG Chuan-Jing, KUANG Fei-Ping, GAO Xiao-Xiao, WENG Wei-Zheng, WAN Hui-Lin   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2008-06-02 Revised:2008-09-08 Published:2008-12-04
  • Contact: HUANG Chuan-Jing; WAN Hui-Lin E-mail:huangcj@xmu.edu.cn;hlwan@xmu.edu.cn

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Abstract: The effect of a Mg promoter on the physical and chemical properties, as well as catalytic performance of the Co/Mg/HZSM-5 catalyst for the partial oxidation of methane(POM) to syngas was studied by XRD, H2-TPR, TEM, Raman, XPS and activity measurements. The activity and stability of the Co/HZSM-5 catalyst was effectively improved by Mg modification. At T=750 ℃ and SV (space velocity)=1.0×105 mL·h-1·g-1 the Mg-modified catalyst exhibited high activity and good stability during a long run. The unmodified catalyst rapidly deactivated after 10 h on stream. Catalyst deactivation was mainly due to the transformation of Co0 into CoAl2O4 as indicated by TPR and XPS. For the Co/Mg/HZSM-5 catalyst the Co species, in addition to ones existing as Co3O4, reacted with the Mg promoter to produce MgCo2O4. This structure, after reduction, led to a higher dispersion of Co metal, compared with the Mg-free catalyst. From the results of the characterization and activity measurements, the relationship between catalyst structure and performance was discussed.

Key words: Co/HZSM-5 catalyst, Magnesiumpromoter, Partial oxidation of methane, Syngas