查询词典 catalytic

A new catalytic kinetic spectrophotometric method for the indirect determination of trace sulfide has been studied. The method was based on the inhibition of sulfide on the iron catalyzed oxidation of xylenol orange by hydrogen peroxide in NH3 medium.

在氨水介质中，硫离子可阻抑Fe催化过氧化氢氧化二甲酚橙褪色，并且催化体系和阻抑体系在570nm处吸光度的差值与硫离子浓度呈线性关系，据此建立了阻抑动力学光度法间接测定痕量硫离子的新方法。

It was shown that ytterbium had a preference to be adsorbed at the crystal defects, enhancing the catalytic activity of substrate.

研究了添加稀土镱对镍磷合金化学镀镀层组织和性能的影响，探讨了镱在化学镀过程中的作用机制。

The present regeneration methods are summarized and their effects on zeolite structure and catalytic performance are also presented.

总结了钛硅分子筛目前采用的主要再生方法，简述了不问再生过程对催化剂结构与性能的影响。

Under the optimum conditions, the linear range of the method was 0-80 μg/L. The detection limit was 4.58×10^(-7) g /L.The catalytic reaction was the zeroth order one. The apparent activation energy and the reaction rate constant was found to be 96.04 kJ/mol and 3.61×10^(-3)/s, respectively. The sensitivity was increased by 3 times in the presence of surfactant.

在最佳实验条件下，方法线性范围为0~80μg/L，检出限为4.58×10^(-7)g/L；催化反应为动力学零级反应，表观活化能为96.04kJ/mol，反应速率常数为3.61×10^(-3)/s；反应在表面活性剂存在下，灵敏度提高3倍。

The catalytic performances of zinc acetate, metal oxide and metal have been investigated for this reaction system.

分别对Zn_2、金属氧化物和金属三种催化体系在该反应中的催化性能进行了研究。

The phase structure of zirconia is important for many catalytic reactions and materials.

氧化锆的晶相结构对其在催化反应中的活性以及作为材料的性能有着决定性的作用，氧化锆体相晶相结构的研究已有很多文献报道，但针对其表面。。。

The aim of this thesis is to synthesize some new chiral quaternary ammonium salts and bis-quaternary ammonium salts from the popular material------Chloramphenicoland abietic acid, and then we used these chiral quaternary ammonium salts in some substitution reactions and addition reactions in order to research their catalytic action and asymmetric induction.

本文利用廉价易得的手性物质——氯霉素和去氢枞酸为初始原料，合成了几种新的季铵盐类手性相转移催化剂，扩大了手性相转移催化剂的来源，并把它们应用于取代反应和加成反应，以探讨其催化机理和不对称诱导效应。

There has been growing interest in the study of a variety of organotin compounds with fungicidal, acaricidal, antitumour and catalytic activities.

具有杀菌、杀螨、抗癌及催化活性的各种有机锡化合物的研究越来越为人们所关注。

In comparison with traditional solid acidiccatalyst of HY, the sulfonic-functionalized mesoporous silicas showedsuperior catalytic performance in the reaction of acetalization betweenbenzaldehyde and alcohols.

其与传统沸石固体酸催化剂HY相比显示了较好的催化性能，应用在苯甲醛与醇类缩合反应中缩醛产率已达到90％，而且具有很好的重复使用性能。

Supported 12-Phosphotungstic Acid and Its Salts as Catalysts for the Synthesis of Fructone and Fructone-B;2. Their catalytic activities were measured by synthesis of fructone-B from ethyl acetoacetate and 1,2-propanediol.

制备了一系列以脱铝超稳Y沸石为载体的磷钨酸及其铯盐催化剂，考察了催化剂在以乙酰乙酸乙酯和1，2-丙二醇为原料催化合成草莓酯反应过程中的性能。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"