Vanadium was introduced to hexagonal mesoporous SiO₂ (HMS) to prepare supported vanadium-based catalysts (V-HMS). Their catalytic performance in the non-oxidative propane dehydrogenation to propylene (PDH) was modulated with V surface density varying from 0.12 to 15.08V atom·nm⁻². VO_x species with different structure were analyzed by UV–vis spectroscopy, NH₃-TPD, H₂-TPR and XPS. High propylene space time yield of 0.73 kg·h⁻¹·kg_cat⁻¹ and excellent regeneration behavior were achieved. Correlating VO_x polymerization degree with catalytic performance, VO_x aggregates, mainly in low-polyvanadate form, were established to reveal high intrinsic activity and stability in comparison with their counterparts, including isolated or/and highly polymerized VO_x as well as V₂O₅. Temporal analysis of products (TAP) identified hydrogen formation as the rate-limiting step in the PDH reaction. In-situ DRIFTS was employed to investigate the reaction mechanism. V species containing C=C bond, i.e., VO_x-C₃H₅, was proposed to be an intermediate of gas-phase propylene.

将钒引入六方介孔SiO ₂ (HMS) 以制备负载型钒基催化剂(V-HMS)。它们在非氧化性丙烷脱氢制丙烯 (PDH) 中的催化性能通过 V 表面密度从 0.12 变化到 15.08V atom·nm ^{- 2}进行调节。通过紫外-可见光谱、NH ₃ -TPD、H ₂ -TPR 和XPS分析了具有不同结构的VO _x物质。^{实现了0.73 kg·h - 1} ·kg _cat ^-1的高丙烯时空产率和优异的再生行为。将VO _x聚合度与催化性能VO _x相关联聚集体，主要是低聚钒酸盐形式，与它们的对应物（包括分离的或/和高度聚合的 VO _x以及 V ₂ O ₅ ）相比，具有较高的内在活性和稳定性。产物的时间分析 (TAP) 确定氢气的形成是 PDH 反应中的限速步骤。采用原位 DRIFTS 研究反应机理。含有C=C键的V物质，即VO _x -C ₃ H ₅，被认为是气相丙烯的中间体。