Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (4): 723-728.doi: 10.3866/PKU.WHXB201402242

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Effects of Promoter on NiMgAl Catalyst Structure and Performance for Carbon Dioxide Reforming of Methane

GUO Zhang-Long1, HUANG Li-Qiong1,2, CHU Wei1, LUO Shi-Zhong1   

  1. 1 Department of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China;
    2 Department of Chemical Engineering, Yunnan Open University, Kunming 650223, P. R. China
  • Received:2013-12-06 Revised:2014-02-24 Published:2014-03-31
  • Contact: CHU Wei E-mail:chuwei1965@scu.edu.cn
  • Supported by:

    The project was supported by the National Key Basic Research Program of China (973) (2011CB201202).

Abstract:

Catalysts were prepared by adding different types of promoter (Co, Ir, or Pt) to the supported nickel catalyst NiMgAl samples. These catalysts were characterized by H2 temperature-programmed reduction (H2-TPR), CO2/CH4 temperature-programmed surface reactions (CO2/CH4-TPSR), and CO2 temperatureprogrammed desorption (CO2-TPD). The effects of the catalyst structure on catalytic performance in the methane dry reforming reaction with carbon dioxide were investigated. The addition of a small amount of promoter (Pt or Ir) can lower the reduction temperature of the nickel active component, and enhance performance in the methane dry reforming reaction. The catalysts with Co or Ir promoter feature lower activation energies than the unmodified NiMgAl catalyst. The activation energy was 51.8 kJ·mol-1 for the NiMgAl sample, decreasing to 26.4 kJ·mol-1 for the NiPtMgAl catalyst, which showed overall better catalytic performance. Results of CH4-TPSR and CO2-TPSR demonstrate that the NiPtMgAl catalyst can generate more active carbon species on the catalyst surface. The CO2-TPD results show that adding a promoter can increase the CO2 adsorbed/desorbed amount compared with the unmodified NiMgAl catalyst over the same reaction temperature range.

Key words: Carbon dioxide reforming of methane, Nickel-based catalyst, Pt promoter, Catalytic activity, Activation energy, Temperature-programmed surface reaction

MSC2000: 

  • O643