A series of W and Sn-containing KIT-6 mesoporous silicates (designated as W_xSn₅) with similar Sn (~5 wt%) and varying W (x = 3–23 wt%) loadings were prepared by a one-pot hydrothermal synthesis method. No detectable bulk WO₃ species were observed for W loading up to 14 wt% with preferential dispersion of WO_x species near SnO₂ sites. The W_xSn₅ materials exhibited superior performance for Friedel-Crafts anisole benzylation with intrinsic rate constants for all W_xSn₅ catalysts being greater than those without Sn. Based on results from DR-UV–Vis, XRD, XPS, EXAFS techniques, we postulate that the W_xSn₅ materials contain both isolated [WO₄]^2-/SnO₂ and isolated [WO₄]^2-/SiO₂ as active species, with the former being more active. The relative populations of these two highly dispersed species dictate the overall catalyst activity. The intrinsic activities of the W_xSn₅ catalysts are found to scale linearly with total acidity but are mainly dictated by the Lewis acid sites.

 用一个锅准备了一系列含W和Sn的KIT-6中孔硅酸盐（指定为W _x Sn ₅），具有相似的Sn（〜5 wt％）和变化的W（x = 3–23 wt％）负载。水热合成法。没有观察到W含量高达14重量％的可检测的大块WO ₃物种，其中WO _x物种优先分散在SnO ₂位点附近。W _x Sn ₅材料表现出对Friedel-Crafts茴香醚苄基化的优异性能，所有W _x Sn _5的固有速率常数催化剂比没有锡的催化剂大。根据DR-UV-Vis，XRD，XPS，EXAFS技术的结果，我们假设W _x Sn ₅材料包含分离的[WO ₄ ] ^2- / SnO ₂和分离的[WO ₄ ] ^2- / SiO ₂作为活跃的物种，前者更为活跃。这两个高度分散的物种的相对种群决定了整体催化剂活性。发现W _x Sn ₅催化剂的固有活性与总酸度成线性比例，但主要由路易斯酸位决定。