摘要
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Al2O3和硅铝上苯酚的升温脱附曲线表明,Al2O3上有较强的碱性吸附点。Webb用HF-Al2O3吸附NH3后再脱附并计算表面吸附的NH3量,认为表面吸附的NH3多,则表面酸也强,Shirasaki在SiO2-Al2O3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。
A new method for solid acid-base strength distribution measurement is suggested. We used CO2 as the adsorption gas for determining base strength distribution and NH3 as the adsorption gas for determining acid strength distribution. We suggest that we can use ,△H/T to represent the acid and base strengthes, and the amounts of adsorbed gases to represent the acidity and basicity. The results obtained by this new method are almost the same as that of the titration method using Hammett indeca-tor. This method can be used not only for calorless catalysts but also for calorful catalysts without using any solvent. We can also inspect the acid-basic qualities of industrial catalysts at the condition close to that catalytic reaction.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第7期778-780,共3页
Chemical Journal of Chinese Universities
关键词
固定催化剂
酸碱分布
表面酸碱
测定方法
Solid catalyst, Measurement, Acid-base strength distribution
