Abstract
Tungsten-incorporated mesostructured silicates were successfully synthesized by evaporation-induced self-assembly (EISA) method. Tungsten loadings from 2.9 to 22.2wt% were achievable, with the corresponding BET surface areas decreasing from 520 to 284m2/g at increased W loading. The W-EISA samples displayed amorphous ordered pore structure with an average pore size distribution of 2.3–3.3nm. Hydrated isolated tetrahedral [WO4]2− species and hydrated octahedral polytungstate species were identified from diffuse reflectance UV/Vis spectra under ambient conditions. Uniform distribution of W species, mostly located near the surface, was evident from XPS W 4f photoelectron image. At 450°C and 1atm, for the reaction of ethylene+2-butene metathesis to form propene, the W-EISA catalysts outperform either impregnated catalysts (WO3/SiO2 and WO3/KIT-6) or one-pot synthesized W-KIT-6 catalyst, implying better W utilization in the W-EISA catalyst.
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