catalyst selectivity

基本解释

In other words, the trace amount of HF acts as a reaction promoter and can raise the catalyst selectivity for the alkylation significantly.
这是一个重要和有趣的实验现象，它说明微量HF反应助剂可大幅度提高固体酸催化剂对烷基化反应的选择性。
The results show that the percent conversion of pinene is 100%, the catalyst's selectivity is over 97%, and it can be used 25 times at least.
结果表明：自制的催化剂可以使得蒎烯的转化率达到100%，选择性达到97%以上，并且可以循环使用25次以上。
Advances in gas-phase oxidation techniques are focused on development of high- activity and high-selectivity catalyst and enhancing the yield of and selectivity to benzaldehyde.
对于气相直接氧化法，开发高活性和高选择性的催化剂，提高苯甲醛的选择性和收率是研究的热点。