查询词典 catalytic

By analyzing the differences between acidic and basic catalytic action in this transesterificatios, it is considered that the main cause of yielding an anisole by-product is due to the basic catalysis, a Lewis acidic catalyst is helpful for the selective DPC formation.

通过分析酸碱催化作用在酯交换反应中的差异，认为碱催化是副产物苯甲醚生成的主要原因，Lewis酸性的催化剂有利于碳酸二苯酯的高选择性。

With this standard method, simultaneous quantification of DMC, MPC, DPC, phenol and anisole can be achieved accurately, which provide the standard methods for evaluation of different catalysts and control of the reaction process. The microwave-aided catalytic technique was applied in the transesterification of DMC and phenol.

分别以苯甲酸乙酯和丙酮为内标物，实现了对酯交换反应塔釜产品和塔顶馏分的同时定量，为评价催化剂活性的高低和工艺条件的优劣提供了标准化分析方法。

However, the low electro-catalytic activity of anodic catalyst restrict its practical use.

但是，阳极催化剂的低活性限制了DMFC的实际应用。

The experimental results indicate that the catalytic decompose efficiency of anthracene reduced linearly with reaction temperature and the concentration of anthracene increased.

实验结果表明：随着催化反应温度的升高，蒽的催化分解效率呈下降趋势，而且呈大致的线性变化规律；蒽的催化分解率随蒽的浓度呈线性递减规律；蒽在V_2O_(5~-)WO_3／TiO_2催化剂上具有良好的空速特性。

Its speculative,anticipatory,and catalytic nature distinguishes theoretical activity from history and criticism.

它的抽象性，预先性和促进性使其和历史及批评分开来。

The cyclodextrin improves the catalytic reduction efficiency of yeast juice, increases the stereo selectivity for bottom object, improves evidently thepercent conversion of bottom object and the antipode excess value of outcome.

环糊精提高了酵母液的催化还原效率，同时增加了对底物的立体选择性，明显提高了底物的转化率和产物的对映体过量值。

But in the process of ion exchange, xylose molecular is easily converted into arabinose because of catalytic isomerization, which results in the decrease of its purity and difficulty of crystal.

木糖是一种在化工、食品等领域有着广泛用途的五碳糖，工业生产是用稀强酸将玉米芯中含有的大量多缩戊糖分解为单个的木糖分子，然后通过离子交换除盐、脱色，精制提取，但在强碱离子交换柱中，木糖分子容易被部分催化异构转化为阿拉伯糖，使得木糖纯度下降，结晶困难。

Compared with traditional way,catalytic aromatization of isophorone has been proved to have many advantages.

与传统工艺相比，异佛尔酮的催化芳构化制备3，5-二甲基苯酚方法具有很多优点。

Furthermore, two synthesising routes are compared and the research of catalytic aromatization of isophorone is summarized in this paper.

本文对两种工艺路线进行了比较，论述了异佛尔酮催化芳构化的研究进展。

The catalytic activities of both zeolites on the aromatization of hexane are determined.

最后对两种样品的催化已烷芳构化的活性进行了测定。

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％。