catalyst 雅思GREGMAT

The workers’ demand for better conditions was a catalyst for social change.

工人们要求改善工作条件促会变革。

It acts as a catalyst in the process of fermentation.

它在发酵过程中起触媒的作用。

All of these show that the DHT-1 catalyst can be well matched with the hydrodewaxing catalysts.

以上结果表明，DHT-1能与异构降凝较好地匹配使用。

A catalyst is a substance which speeds up a chemical reaction.

催化是一种能加速化学反应的物质。

Resinification of furfural on the catalyst was the main cause of deactivation.

糠醛树脂化结焦是导致催化失活的主要原因。

The research on the amino acid by dehydrogenation alkanolamine(s) in catalyst was recommended.

介绍国内外醇胺催化脱氢制备氨基酸的研究发展情况。

Propylene glycol monoether acetate was synthesized using heteropoly acid as catalyst for the firsttime.

首次以杂多酸为催化采用酯化法合成丙二醇单乙醚乙酸酯。

By using phase transfer catalyst, the yield of the preparation of cyclopropane carboxylic isopropyl ester was increased.

在环丙甲酸异丙酯的合成反应中,通过转移催化提高反应收率。

N,N-diethylaniline was synthesized under normal tempreture with tetraethyl ammonium hydroxide as phase transfer catalyst.

以苯胺和溴乙烷为原料,用四乙基氢氧化铵作转移催化,在常压下合成N,N二乙基苯胺。

CuFe-PILC catalyst was prepared by doping technology during the preparation process of pillaring agent.

在此基础上对其行掺杂改性，获得铜铁复合层柱粘土催化。

Bromooctane was synthesized from industrial hydrobromic acid(48%) and n-octanol using concentrated sulfuric acid as catalyst.

以工业废氢溴酸(48%)为原料,在浓硫酸存在下,与正辛醇行反应合成1-溴辛烷。

Ethyl lauryl alcohol respectively react with hydrobromic acid to product bromohydrocarbon,sulfuric acid for catalyst。

以正十二醇和氢溴酸为原料,在浓硫酸的催化下,生产溴十二烷。

Ethylene glycol monoether acetate are synthesized from acetic acid and ethylene glycol monoethyl ether with supported phosphotungstic acid catalyst.

以醋酸和乙二醇单乙醚为原料,活性白土负磷钨酸作为催化,合成乙二醇单乙醚醋酸酯。

The performance of this catalyst for the cross-coupling reaction of iodobenzene with acrylic acid was studied.

研究该催化对碘代苯与丙烯酸交叉偶联生成反式-肉桂酸的催化性能。

The best reaction condition are determined when synthesizing dibutyl maleate by using sloid chloride as catalyst.

提出以固氯化物为催化合成马来酸二丁酯的最佳反应条件。

The fuberidazole was prepared by reaction of O-phenylendiamine with furfural at the presence of CTMABas catalyst.

以邻苯二胺和糠醛为原料,以十六甲基三烷基溴化铵(CTMAB)为催化合成麦穗宁。

To optimize the process of prepartion isorotenone from rotenone by using Lewis acid AlCl3 as catalyst.

为优化鱼藤酮异构化制备异鱼藤酮的工艺。

The synthesis of nerolin bromelia by use of various phase transfer catalysts at different conditionsis studied.

研究利用多种转移催化在不同条件下合成橙花素。

Nitrodiphenylamine is synthesiized by direct condensing method,adsopting aniline and 2-nitrochlorobenzene as feeds,PEG as phase transfer catalyst.

以苯胺、邻硝基氯苯为原料,采用直接缩合法引入转移催化合成邻硝基二苯胺。

Activated carbon as the sorbent and catalyst support was capsulated with ethyl cellulose by phase separation methods.

摘要对兼具吸附和催化功能的多孔结构活性炭，以乙基纤维素为材料用分离行包覆。