Citation: GUO Zhang-Long, HUANG Li-Qiong, CHU Wei, LUO Shi-Zhong. Effects of Promoter on NiMgAl Catalyst Structure and Performance for Carbon Dioxide Reforming of Methane[J]. Acta Physico-Chimica Sinica, 2014, 30(4): 723-728. doi: 10.3866/PKU.WHXB201402242
助剂对NiMgAl催化剂的结构和甲烷二氧化碳重整反应性能的影响
向担载镍基催化剂NiMgAl 中添加助剂(Co,Ir 或Pt)制备了三种助剂促进型催化剂,通过氢气程序升温还原(H2-TPR),CO2/CH4程序升温表面反应(CO2/CH4-TPSR)和CO2程序升温脱附(CO2-TPD)等方法对催化剂进行表征. 助剂对催化剂性能的影响通过甲烷干重整实验进行评价. 添加少量的Pt 或Ir 助剂可以降低Ni 活性组分的还原温度和提高反应性能. 添加助剂的样品与原始NiMgAl催化剂相比能够降低反应的活化能,添加Co或Ir 助剂的催化剂与NiMgAl 催化剂相比活化能有了明显的降低. NiMgAl 催化剂的活化能为51.8 kJ·mol-1,添加Pt 助剂的NiPtMgAl 催化剂活化能降至26.4 kJ·mol-1. NiMgAl 催化剂中添加Pt 助剂制备的催化剂具有较好的催化活性和较低的活化能. CH4-TPSR和CO2-TPSR结果表明添加Pt 助剂可以在更低的温度下(与NiMgAl催化剂相比)提高CH4的活化能力,并在催化剂表面形成更多的碳物种. CO2-TPD结果显示,添加助剂的催化剂与NiMgAl样品相比在反应温度区间内增加了CO2的吸附/脱附量.
English
Effects of Promoter on NiMgAl Catalyst Structure and Performance for Carbon Dioxide Reforming of Methane
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.
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