查询词典 catalyst

A novel Pd／C catalyst with high activity,high selectivity and good stability developed by our group was used for the hydrogenation of N-（3-nitro-4-methoxyphenyl）acetamide into N-（3-amino-4-methoxyphenyl）acetamide in methanol and water,respectively.

笔者开发了一种高效的Pd／C催化剂，分别选用甲醇和水作为反应溶剂，实现了高活性、高选择性和高稳定性地催化加氢制备N-（3-氨基-4-甲氧基苯基）乙酰胺。

The time for the reaction to go to completion depends on both the amount of catalyst and acetic anhydride used.

该酰化反应进行到完全所需的时间取决于催化剂用量和乙酐用量。

Methods Salicylic acid and acetic anhydride were used as the raw materials, with concentrated sulfuric acid as the catalyst.

目的 建立乙酰水杨酸的快速合成方法。

The effects of the amount of catalyst, the amount of acetic anhydride, reaction time, and addition of solvents etc. on the acylation reaction were investigated.

考察了催化剂用量、乙酐用量、反应时间和溶剂的加入等因素对该酰化反应的影响。

It was found that H3PO4 is an effective catalyst for the acylation of 2,3-dimethyl-2-butene by acetic anhydride at room temperature.

结果表明，H3PO4是室温下催化2，3-二甲基-2-丁烯与乙酐酰化反应的有效催化剂。

The catalytic esterification of acetic anhydride and nine phenols were investigated in the presence of complex resin catalyst at 20 ℃,and its mechanismes were discussed.

研究了 2 0℃时，醋酸酐与九种酚在复合树脂催化剂下的催化酯化反应，并探索了其反应的机理。

The synthesis of terpinyl acetate with terpineol and acetic anhydride as reactants and cerium sulfate as catalyst was studied.

研究了以Ce(SO4)2.4H2O为催化剂，松油醇和乙酸酐为原料合成乙酸松油酯。

It was found that SnCl_2·2H_2O is an effective catalyst for the acylation of 2,3-dimethyl-2-butene by acetic anhydride at room temperature.

发现SnCl2·2H2O是室温下2，3-二甲基-2-丁烯与乙酐进行酰化反应的有效催化剂。

This article describes the production status, and discusses the strongpoint and shortcoming of using differente catalyst, sulfur and acetic anhydride .

对比两种催化剂的实际生产情况，阐述用硫磺以及用醋酐的优缺点。

Therefore,a lower temperature(50℃)and a higher catalyst dosage were adopted in acetylation of high-grade bamboo pulp.

因而我们选择了乙酰化反应采用较低的温度(50℃)相对较高的催化剂用量3%。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。