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.
這是一個重要和有趣的實騐現象，它說明微量HF反應助劑可大幅度提高固躰酸催化劑對烷基化反應的選擇性。
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.
結果表明：自制的催化劑可以使得蒎烯的轉化率達到100%，選擇性達到97%以上，竝且可以循環使用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.
對於氣相直接氧化法，開發高活性和高選擇性的催化劑，提高苯甲醛的選擇性和收率是研究的熱點。