查询词典 catalytic

Is the theory as a guide, the selection of a heterogeneous catalytic function of inorganic salt, the efficient preparation of compound catalyst, can make the original conversion rate of increase heterogeneous 4 to 5 percentage points, reducing the pollution of the environment and can significantly reduce Fumarate production costs and have a good economic and environmental benefits.

是以相关理论为指导，遴选有异构催化功能的无机盐，制备复合型的高效催化剂，可以使原有的异构转化率提高4～5个百分点，减少对环境的污染，且能显著降低富马酸的生产成本，有很好的经济效益和环保效益。

Based on functional group transformation and C-C bond formation,this review focuses on the first-rate progress of the catalytic asymmetric reaction in China in recent years,especially its application in synthesis of chiral drugs and pharmaceutical intermediates.

本文从官能团的转换和碳硫键形成的角度概述了我国近年来在不对称催化反应领域的研究进展，特别是在手性药物及其中间体合成中的应用进展。

The mechanism was discussed in the proton acid catalytic reaction of furan phenol cyclization.

探讨了呋喃酚环合反应质子酸催化机理。

Three types of catalysts, ZSM-5, Al2O3, SiO2-Al2O3, were prepared and their catalytic performances for the reaction of furan with ammonia to product pyrrole was studied.

本文制备了ZSM-5、Al2O3 、SiO2-Al2O3三种类型的固体酸催化剂，并通过在常压固定床反应器中进行的氨与呋喃合成吡咯的反应对三种催化剂的性能进行了研究。

Based on the characteristic of the model reaction system for n Butane oxidation to maleic anhydride and the forced unsteady state operation technique in catalytic reactor, an experimental set up was built for investigation of FUSO in fixed bed reactor operated under feed composition cycling mode.

根据人为非定态操作技术和丁烷氧化制顺酐反应的特点，以 CDS- 80 4微反系统为基础，建立了一套用于丁烷氧化制顺酐固定床反应器浓度周期操作的实验装置，具有操作方便、运行可靠的特点。

objective to study the catalytic activity of gallium sulfate in the synthesis of n-butyl propionate.

目的研究硫酸镓在合成丙酸正丁酯工艺中的催化性能。

In this thesis, we mainly studied on the catalytic properties of gallium salts.

本论文主要从三价镓金属路易斯酸催化有机反应的角度展开。

The synthesis of diethyl oxalate and oxalic acid by catalytic coupling reaction of carbon monoxide in gaseous phase at normal pressure is one of important projects of C〓 chemical technology.

CO常压、气固相催化偶联合成草酸和草酸酯等是目前碳一化学研究的重要课题之一。

The above effects of ultrasound on the structure and catalytic properties were related to the frequency of used ultrasound, and the relationship followed the Gaussian distribution curve approximately. The maximum was located at 50 kHz ultrasound.

并且超声波对催化剂结构和催化性能的影响与超声波频率有关，不同频率的超声波对LaBO〓催化剂结构和性能影响的规律近似高斯分布曲线，以50kHz的超声波影响最大。

Prediction for secondary structure and function suggested that the 23rd amino acid residue-cysteine and nearby sequence is in a consensus pattern of Glyceraldehyde 3-phosphate dehydrogenase active site, in which the Cys is the catalytic residue, and there are some potential sites which may have biological signification in E20-GPD.

二级结构和功能预测分析表明，E20-GPD第23位的半胱氨酸及其附近序列为3-磷酸甘油醛脱氢酶活性位点一致序列，C为活性位点，第50位的组氨酸也是十分保守的，且E20-GPD具有多个可能的有生物学意义的位点。

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％。