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进了社会变革。

It acts as a catalyst in the process of fermentation.

它在发酵过程起触媒的作用。

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.

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化失活的主要原因。

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

介绍了国内外醇胺化脱氢制备氨基酸的研究发展情况。

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,通过相转移化提高了反应收率。

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

首次以杂多酸为化采用酯化法合成丙二醇单乙醚乙酸酯。

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,与正辛醇进行反应合成1-溴辛烷。

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相转移化,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.

在此基础上对其进行掺杂改性，获得了铜铁复合层柱粘土化。

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化,合成了乙二醇单乙醚醋酸酯。

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

研究了利用多种相转移化在不同条件下合成橙花素。

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

研究了该化对碘代苯与丙烯酸交叉偶联生成反式-肉桂酸的化性能。

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

提出了以固氯化物为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)为化合成了麦穗宁。

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

为了优化鱼藤酮异构化制备异鱼藤酮的工艺。

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相转移化合成邻硝基二苯胺。

Dibenzyl sulfoxide and dibenzyl sulfone were synthesized from dibenzyl sulfide oxidated with H 2O 2 without catalyst.

在无化条件下利用过氧化氢氧化二苄基硫醚合成了二苄基亚砜和二苄基砜。