催化过程中许多催化剂或担体,如硅胶、氧化铝、硅酸铝都具有高比表面与微孔结构,表现为微晶与非晶型,与结晶物质比较,其X光衍射图比较弥散,不能用通常的Bragg技术来研究其晶体结构。Hedvall等人指出,固体的催化活性可通过机械作用及其他化学处理后来提高。而这些处理也大多会减弱其结晶性质,例如乙烯加氢所用镍催化剂。因此大多数活性高的催化剂,表现为微晶与非晶型。因而许多科学工作者在寻找催化中心与原子间距及原子配位数之间的关系。Okamoto及Erying研究炭—镍及炭上的H_2吸附来考察原子间距的影响,发 Many catalysts or supports, such as silica gel, alumina and aluminum silicate, have high specific surface area and micropore structure in the process of catalysis, showing microcrystalline and amorphous. Compared with the crystalline material, the X-ray diffraction pattern is diffused and can not be dispersed The usual Bragg technology to study its crystal structure. Hedvall et al. Indicate that the catalytic activity of a solid can be increased later by mechanical action and other chemical treatments. These treatments also mostly weaken their crystalline nature, such as nickel catalysts for hydrogenation of ethylene. Therefore, the most active catalyst, the performance of microcrystalline and amorphous. As a result, many scientists are looking for the relationship between the catalytic center and the atomic and atomic coordination numbers. Okamoto and Erying study carbon-nickel and carbon on the H_2 adsorption to examine the effect of atomic spacing, hair