Preparation of Ru/SBA-15 mesoporous silica catalyst and its catalysis for WGS reaction

The supported Ru-based catalyst promoted by lanthanum oxide was prepared by impregnating the SBA-15 carrier with aqueous Ru(Ac)₃ and La(NO₃)₃ solution using vacuum absorbing method. The as-prepared catalysts were investigated by means of X-ray powder diffraction, transmission electron microscopy, and catalytic activity measurement for water-gas shift reaction. SBA-15 silica synthesized with P₁₂₃ by reaction at 80℃ for 24h proved to be a mesoporous product with a mean pore size of 8nm. Metallic Ru was well dispersed on SBA-15 carrier as nanoparticles in 1nm size. The results indicated that the optimized content of ruthenium and lanthanum oxide in catalyst is 4% and 8%, respectively. Under conditions of SV=2000h^-1 and Vsteam/Vgas=1, the CO conversion is 56% at 255℃ and 98% at 265℃ for catalyst R4L8/SBA-15.