催化的

Propargyl alcohol was protected by dihydrophran with the catalysis of PPTS ,and then reacted with Ethyl Mag bromide to prepare its corresponding Grignard reagent.

炔丙醇在 PPTS 催化下由二氢吡喃保护，与溴乙烷格氏试剂反应生成相应的格氏试剂，然后与氯甲酸甲酯反应得到羟基丁炔酸甲酯四氢吡喃醚，在 PPTS 催化下脱保护后进行甲磺酰化，由溴化钠进行溴取代后合成了4-溴-2-丁炔酸甲酯，总收率达53%。

The enzyme showed typical psychrophilic behavior: it was more active at temperatures between 15-40℃, and its activity decreased rapidly at 45℃. It lost activity after 15min at 45℃.

该酶具有典型的低温酶特征：在15-40℃范围催化活性较高，在45℃时催化活性显著下降；45℃水浴处理5分钟，酶活力即丧失58％，处理15分钟，酶活则完全丧失。

In this paper the preparation of biodiesel from Stillingia oil by transesterification is investigated using KF/γ-Al2O3 as solid nanocatalyst.

以γ-Al2O3为载体负载KF，制备纳米KF/γ-Al2O3酯交换催化剂，用于催化乌桕籽油制备生物柴油，研究了不同制备条件下纳米催化剂KF/γ-Al2O3的催化性能。

At first, the method of determined tannase activity was established, catalysis kinetics, catalysis characteristcs of tannase and solubility of it in RM were also studied. At the same time, various of factors effecting tannase activity were investigated.

本课题在单宁酶菌种选育及单宁酶制备研究的基础上，首次以反胶束体系为介质，确立了有机相中单宁酶活力测定方法，研究了单宁酶在反胶束中增溶定位方式、催化动力学和催化特性。

Low concentration of Fe〓 and Mn〓 could enhance photocatalytic degradation of trichloromethane、Aroclor1260 and humic acid, but when the concentration of Fe〓 and Mn〓 was high, it could prevent photocatalytic degradation.

研究发现当溶液中Fe〓及Mn〓浓度较低时，对光催化降解三氯甲烷、Aroclor1260及腐殖酸有一定的促进作用，但当浓度逐渐增加时，这些离子又对光催化降解起阻碍作用。

In the absence of organic solvent and phase-transfer catalyst, the catalytic oxidation of cyclohexene to adipic acid with aqueous 30% hydrogen peroxide by weight can be efficiently catalyzed by tungstenic acid /inorganic acidic ligand.

以钨酸／无机酸性配体为催化体系，在无有机溶剂和相转移剂的情况下，催化过氧化氢(质量分数30％)氧化环己烯合成己二酸。

The results indicated that novel catalyst system had high activity for propylene oligomerization. The products were mainly tetramer and pentamer.

结果表明：该配合物催化丙烯低聚具有较高的催化活性，产物主要以四聚物、五聚物为主。

After separation,the sample is further alkalized by microwave catalysis and at last,the activated white carbon is obtained.

针对以往从高岭土提取白炭黑传统方法中存在的某些缺点，对滇南某高岭土采取中温活化、除杂，在酸性介质中微波液相催化反应，分离后，再进一步在微波催化下液相碱溶，最终提取了活性白炭黑产品。

This paper describes the experiment of hydrolysis of cellulose under acid and enzyme catalyzing.

探讨纤维素在酸催化及酶催化作用下的降解方法。

In order to utilize lignin effectively, base on the situation in China, the study was carried on systematically, centering around the topic of two step sulfomethylation of the soda lignin of wheat straw (the first step is methylolation, the second is sulfonation) and its application. The main purpose is to develop a heterogeneous catalytic system which not only catalyzes but also homogenizes the lignin molecule in the reaction.

为真正高效利用碱木素，木论文根据我国实情，紧紧围绕着麦草碱木素两步磺甲基化（第一步为羟甲基化，第二步为磺化）及其应用这一主题，以开发出在反应过程中既可催化反应又能使木素分子均一化的多相催化体系为主要目标，系统地展开了研究。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。