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实验发现许多离子晶体或分子晶体物质与高比表面载体混合后,在低于这些晶体熔点的适当温度下烘烤,这些晶体物质可在载体表面自发分散。烘烤前的X光衍射图有这些晶体的特征峰,烘烤后这些峰变矮以致完全消失。其原因是这些离子或分子与载体表面离子或基团有较强结合力,足以克服这些晶体内部的结合力,使它们分散成表面层相。 对于催化剂的活性组份如果不是金属而是化合物(盐类、氧化物等),其含量又不足在载体表面敷满单层时,常常是以单层分散的方式存在。 本文所得结果,为过去难以进行研究的固-固吸附领域,提供了一种较有效的研究方法和一些基本观点。
It has been experimentally found that many ionic or molecular crystalline materials are mixed with a high specific surface carrier and baked at a temperature below the melting point of these crystals which can spontaneously disperse on the surface of the carrier. The X-ray diffraction pattern before baking has the characteristic peaks of these crystals, which are shortened to completely disappear after baking. The reason is that these ions or molecules and carrier surface ions or groups have a strong binding force, enough to overcome the internal binding force of these crystals, so that they dispersed into the surface phase. If the active component of the catalyst is not a metal but a compound (salts, oxides, etc.) in an insufficient amount, it is often present in a monolayer dispersion when the surface of the support is covered with a monolayer. The results obtained in this paper provide a more effective research method and some basic ideas for the field of solid-solid adsorption, which was difficult to study in the past.