MoO3与NaY、丝光沸石的表面相互作用研究

将晶相MoO_3分别同NaY、丝光沸石(NaM)充分研磨混合后, 在450 ℃下焙烧24小时, 制成氧化物负载型催化剂, 然后进行X射线衍射、激光Raman光谱、IR光谱和比表面测定. 实验结果表明MoO_3与分子筛载体之间存在强烈的表面相互作用, 致使晶相MoO_3经焙烧进入分子筛孔道, 以非晶相表面层的形态存在于NaY、NaM的骨架结构中; 并致使NaY晶格结构受到破坏, 结晶度和比表面降低, 而NaM的结构稳定性较高, 晶格结构基本上不受MoO_3分散的影响. X射线衍射相定量法求得MoO_3在1克NaY和NaM上的最大分散量分别是0.54克和0.11克。

The Study on the Surface Interaction Between MoO3 and NaY and Mordenite

Crystalline MoO_3 and supports NaY, mordenite are mixed thoroughly, and the mixtures are calcined at 450 ℃ for 24 hours. A series of zeolites with dispersed MoO_3 are studied by XRD, Laser Raman, IR spectroscopy and surface area measurements. It is shown that duriag the calcination MoO_3 interacts strongly with NaY and mordenite. As a result of this sarface interaction MoO_3 migrates into the cavities of zeolites and disperses on it's surface as a non-crystalline layer. Moreover, the framework of NaY is destroyed by the dispersed MoO_3, but there are less effects on the mordenite's structure because of it's higher stability.By XRD method, we estimate the maximum amount of dispersed MoO_3 is 0.54 and 0.11 gram per gram of NaY and mordenite respectively.