查询词典 catalyst

In 2004, used emission control technology,such as used catalyst rich metals. Both S and P

2004，使用贵金属更多的催化剂等控制排放技术，汽油机油中的磷含量和

The effects of aromatic solvents, catalyst amount used and reaction conditions on the enantiomer excess e.

本文还探讨了手性相转移催化条件下扁桃酸异构体的不对称合成。

A bottom layer of nickel catalyst was provided to promote the endothermic reaction of steam and methane.

底层镍催化剂促进蒸汽和甲烷的吸热反应。

Iodine was found to be an efficient catalyst for the imino Diels-Alder reaction of N -arylimine with enol ethers to provide tetrahydroquinolines in good yields.

发现碘能够有效地催化N－芳基亚胺和烯醇醚之间的亚胺Diels-Alder反应，以较高的产率得到四氢喹啉衍生物。

Therefore, it is a kind of effective and environ- mental friendly esterification catalyst.

由此可见，该催化剂是一种固载程度良好的环境友好型催化剂。

Based on literature survey the writer takes as basis the thermodynamic data determined experimentally and published in the literature and, in the light of the theory related to heterogeneous reaction system in thermodynamics, gives a detailed analysis of thermodynamic stability under temperature and atmospheric conditions in the shift reactor with the iron-based high-temperature shift catalyst, obtaining relevant equilibrium phase diagram of the heterogeneous reaction system and corresponding calculation formulas.

笔者在文献调研的基础上，以文献发表的、经由试验测定的热力学数据－标准生成自由能为依据，根据热力学中非均相反应体系的有关理论，对铁基高温变换催化剂在变换反应的气氛与温度条件下的热力学稳定性进行了较详细的分析，建立了相关的非均相反应体系的平衡相图和相应的数学表达式。

The essential point is the choice of catalyst.

对于这种合成聚碳酸酯的方法，该反应的关键在于选择高活性催化剂。

The effects of the amount of the catalyst, reaction temperature and reaction time on the yield of the ester have been investigated.

考察了催化剂用量、反应温度和反应时间对酯产率的影响。

Influence of alcohol-to-acid mole ratio, reaction temperature, catalyst dosage and reaction time on the esterification was investigated.

考察了醇酸物质的量比、温度、催化剂用量、反应时间等各种因素对酯化率的影响。

The results showed that this catalyst had higher catalytic activity for esterification, made simplic...

结果表明，该催化剂催化活性好，后处理容易，可以重复使用，降低了成本，且无"三废"污染。

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。