Correlation of the Vanadium Precursor and Structure Performance of Porous VOX-SiO2 Solids for Catalytic Dehydrogenation of Propane
VOX-SiO2 catalysts have been synthesized by the one-pot method using different vanadium precursors, namely, ammonium metavanadate (NH4VO3; VO3–, V5+), vanadium acetylacetonate [V(acac)3; organic complex, V3+], and vanadyl sulfate (VOSO4; VO2+, V4+). The influence of different vanadium precursors on the structure–performance relationship of these catalysts is studied on the propane dehydrogenation (PDH) reaction. The catalysts derived from VO3– attain a mesoporous structure with fairly high specific surface area and large pore volume, while those prepared with V(acac)3 or VOSO4 display a microporous structure. It is noted that VOX-SiO2 catalysts derived from NH4VO3 present a better catalytic performance, and low-polymerized VOX species display better intrinsic activity compared with isolated species. This study may contribute to the selection of vanadium precursors for the one-pot synthesis.
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