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酸碱催化是一类很重要的催化反应,酸碱强度分布和酸碱反应类型之间有着对应关系,因此,对表面酸碱的测定具有重要的意义。 固体表面酸碱的测定方法很多,常用的是Hammett指示剂酸碱滴定法,但这种方法不能用于测定有色催化剂,神保等研究的Al_2O_3和硅铝上苯酚的升温脱附曲线表明,Al_2O_3上有较强的碱性吸附点。Webb用HF-Al_2O_3吸附NH_3后再脱附并计算表面吸附的NH_3量,认为表面吸附的NH_3多,则表面酸也强,Shirasaki在SiO_2-Al_2O_3上吸附吡啶等气体后,以吸附量x对da/dx(s为吸附热)作图,得到酸碱分布图,Zetllemoyey用吸附热对吸附量的倒数作
Acid-base catalysis is a very important class of catalytic reactions. There is a correspondence between the acid-base intensity distribution and the type of acid-base reaction. Therefore, it is of great significance to determine the acid-base surface. Solid surface acid-base determination of many ways, commonly used Hammett indicator acid-base titration method, but this method can not be used for the determination of colored catalyst, Shen Bao and other studies of Al 2 O 3 and silicon-aluminum-phenol on the temperature-dependent desorption curve shows that Al 2 O 3 There is a strong point of alkaline adsorption. After adsorbing NH 3 by HF-Al 2 O 3, Webb desorbs and calculates the amount of adsorbed NH 3 on the surface. The adsorption of NH 3 on the adsorbed amount of X on the SiO 2 -Al 2 O 3 adsorbs Shi et al. / dx (s is the heat of adsorption) is plotted to obtain the acid-base distribution diagram, Zetllemoyey with the heat of adsorption on the reciprocal of the amount of adsorption