catalyst selectivity

基本解釋

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(gè)重要和有趣的實(shí)驗(yàn)現(xiàn)象，它說(shuō)明微量HF反應(yīng)助劑可大幅度提高固體酸催化劑對(duì)烷基化反應(yīng)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(jié)果表明：自制的催化劑可以使得蒎烯的轉(zhuǎn)化率達(dá)到100%，選擇性達(dá)到97%以上，并且可以循環(huán)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(duì)于氣相直接氧化法，開發(fā)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(diǎn)。