Effect Of Ce_xzr_(1-x)o_2 Promoter On Ni-based Sba-15 Catalyst For Steam Reforming Of Methane

摘要

Ni/Ce_xZr_(1-x)O_2/SBA-15 catalysts were prepared and the catalytic activity for steam reforming of methane reaction was investigated. The addition of Ce_xZr_(1-x)O_2 could obviously enhance catalytic activity of the Ni-based catalyst and Ni/CeO_2/SBA-15 catalyst shows the excellent catalytic activity and stability at 800 ℃ over 792 h on steam. After reaction, the mesoporous structure of SBA-15 is still present and the pore walls of SBA-15 prevent the aggregation of nickel. The high catalytic activity and stability of Ni/Ce_xZr_(1-x)O_2/SBA-15 catalyst is due to a Ce_xZr_(1-x)O_2 layer precoated on SBA-15, which plays a role in forming high activity Ni species rather than bulk NiO and giving mobile oxygen species.