催化的

Propylene epoxidation to propylene epoxide is one of the most important challenges in catalysis because this reaction possesses both industrial significance and academic importance.

中文摘要：丙烯环氧化制环氧丙烷具有重大的工业应用背景和重要的学术意义，开拓该反应的高效催化体系和催化剂是催化领域的最重要的挑战之一。

Use SEM/EDX, TEM and XRD instrument to determine the basic characteristic of the photocatalyst, and apply the photocatalyst to decompose methyl blue solution to discuss with its performance and functions.

用铜属本身捕获二氧化钛光生电子的能及其变价特性，有效减少电子电再结合的机，因此经过属改质的二氧化钛光触媒具有佳的光催化效果，藉由SEM/EDX、TEM与XRD等仪器鉴定此光触媒之基本特性，并将其应用於分解亚甲基溶液以探讨其光催化分解性能。

Firstly, simultaneous removal of NO〓-C over mixture of metal oxides catalyst and carbon black was carried out with and without the assistanet of plasma. Secondly, catalysts loaded on γ-Al〓O〓 spherules were exposed to CA498 diesel exhausts to capture the PM, then the investigation into simultaneous removal of NO〓 and PM over catalyst with and without the assistant of plasma was conducted.

首先以复合金属氧化物催化剂和碳黑粉末的紧接触混合物为对象，进行等离子体／催化同时去除NO〓和碳黑的研究；然后以涂覆有催化剂的γ-Al〓O〓小球为载体，在实际柴油机尾气中挂烟，通过等离子体／催化作用，在模拟的富氧柴油机排气环境中，达到同时去除NO〓和微粒排放的目的。

An oxidation catalytic converter is mainly used for catalytic conversion of unburned THC and CO in the exhaust gas, and its primary principle is to reduce the hazardous materials by farther oxidating of the unburned intermediate reactive products in the exhaust gas.

氧化型催化转换器主要用来催化转换排气成分中的THC和CO，其主要工作原理是进一步氧化排气成分中的未完全燃烧的中间产物，以降低排气成分中的有害物质。但是，其工作的热力学环境将大大影响工作性能和效率。

The catalytic behavior of these complexes in the hydrosilylation ofα-olefins with triethoxysilane has been investigated systematically.

二、富勒烯过渡金属配合物的合成及其催化性能的研究以富勒烯为基的衍生物一般具有独特的催化性能。

Catalytic thermal cracking technology, making use of VGO and residue as feedstock and solid acid catalyst which consists of ZSM-5 zeolite as major activity components, is a new process of producing low-carbon olefines composed of ethylene and propylene mainly under certain condition in FCC plant.

催化热裂解技术是以减压馏分油和渣油为原料，使用以ZSM-5分子筛为主要活性组元的固体酸催化剂，在催化裂化装置上，在一定的工艺条件下生产乙烯和丙烯为主的低碳烯烃的一项新工艺。

Based on the prediction model for uncatalytic double base propellant burning rate the dissertation, carrys on the mathematical treatment to the hypothesis of polyemerization and disintegration, deduces the formula of catalytic double base propellant burning rate and pressure exponent; The results of experimental tests show that it can re-present quantitatively various stage of plateau combustion: super rate, plateau and mesa. The calculated results conform with the experimental results very well.

在非催化双基推进剂燃速预估理论的基础上，对聚合裂解的假设进行数学处理，导出催化双基推进剂的燃速公式和燃速压力指数公式；实验验证结果表明，模型中的公式可以定量地再现双基平台推进剂燃烧中的超速，平台和麦撒现象，而且计算值和实测值符合得较好。

On the other hand, sodium tungstate dehydrate complexed with oxalic acid can act as highly efficient catalysts for the transformation from alcohols to carbonyl compounds under controlled microwave irradiation and solvent-free conditions.

第二部分中，我们观察到，作为一种过程强化手段，微波具有显著的促进催化选择氧化反应加速进行的能力，这在多相的锰氧化合物体系和均相的钨酸钠—草酸催化体系中都有具体表现。

Novozym 435 was used for the synthesis of vitamin A plamitate. The influences of solvent, the molar ratio of substrates, the reaction temperature and time, and the water concentration were optimized and the best result was obtained by interesterification from 0.200 g vitamin A acetate and 0.468 g palmitic acid, at 30℃, in 10 mL hexane, containing 0% of water, with 10% of lipase(mass ratio, immobilized lipase to vitamin A plamitate). In these conditions, 75% of vitamin A acetate was converted into vitamin A plamitate. The immobilized lipase was reused about 6 batches.

对催化合成维生素A棕榈酸酯反应的脂肪酶和反应介质比较，同时对影响合成维生素A棕榈酸酯反应的因素（温度、初始水含量、底物摩尔比、反应时间和酶量等）进行了探讨，优化了反应条件：在10 mL不含水分的正己烷中，0.200 g 维生素A醋酸酯和0.468 g棕榈酸在酶量为10％（指固定化酶与维生素A醋酸酯的质量比）的固定化脂肪酶催化下，在 30℃、190 r/min下反应6 h，转化率可以达到75%，固定化酶可连续使用6次以上。

The results of the surface composition of the sample washed with and without aqueous ammonia show that most of the impurities which consists of C, B, O elenents mainly can be removed by washing with aqueous ammonia.

测量了改变KBH〓/Ni〓制备的样品的组成、粒径和催化活性，发现当KBH〓Ni〓＞2时催化活性逐渐下降，这是由于随KBH〓/Ni〓的增加颗粒的粒径增大，从而导致活性中心的数量下降所致。

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％。