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The catalytic activity of this new resin catalyst in the isobutene oligomerization was measured in detail, it exhibited good catalytic activity and excellent isobutene dimerization selectivity.

在异丁烯的低聚反应中，对这种新型树脂催化剂的催化活性进行了细致的研究，磺化聚醚碸酮树脂催化剂在反应中表现出了很好的催化活性和优良的二聚选择性。

In this paper, the catalyst and process of dimethyl ether from syngas were studied.

合成气一步法制二甲醚是近年来开发的一种新技术，相对于传统的两步法合成工艺，即先合成甲醇再脱水制二甲醚，合成气一步法合成二甲醚因其热力学上的有利性和经济上的合理性，成为C1化学研究的一个热点。

The diol ester compound was used as a new-type internal electron donor forZiegler-Natta catalyst system recently.

二醇酯类化合物是近年提出的用于丙烯聚合催化剂的新型内给电子体，以它为内给电子体的Ziegler-Natta催化体系催化丙烯聚合得到的聚合物具有等规度高，易于加工等优良性能。

When used in LAB complex unit with multi-step hydrogenation process,DSH-1 selective hydrogenation catalyst,which contain noble metal Pd,can transmit diolefin s to olefins effectively,and has good activation and selectivity.

DSH -1型含贵金属Pd双烯选择性加氢催化剂与多段加氢工艺结合，应用于脱氢法生产直链烷基苯的联合装置中，能有效地将脱氢过程产生的双烯烃转化成单烯烃，具有很好的反应活性和选择性，且操作弹性大，工艺过程简单。

The catalyst system for polyisocyanates has high reality and prompts to generate thiourea dione accounting for large proportion of polyisocyanates.

本发明所提供的异氰酸酯低聚用催化剂体系，具有高活性并且还促使生成占制成的多异氰酸酯中相当比例的脲二酮。

The synthesis of 1,4 dioxane from diethylene glycol using p toluene sulphonic acid as a catalyst was discussed.

利用二甘醇为原料，以对甲苯磺酸为催化剂合成了 1 ，4 -二氧六环。

Under the conditions that the molar ratio of dimethyl carbonate to N,N′-diphenyl urea was 10∶1,the amount of catalyst Bu2SnO was 2%,reaction temperature was 160℃,and reaction time was 2 h,the yiel...

在反应物碳酸二甲酯和二苯基脲的摩尔比为10∶1，催化剂Bu2SnO的用量为2%，160℃时，反应2h，MPC的收率达到98%，远高于文献结果(77%)。

The molar ratio of different metal ions within support, the preparation methods of supports and catalysts, and other factors had been studied. The activity of catalyst was evaluated by the synthesis experiments of diphenyl carbonate.

实验考察了载体金属离子的组成和配比、载体和催化剂的制备方法等因素对催化活性的影响，以苯酚氧化羰基化反应合成DPC的实验结果对催化活性进行了评价。

The reaction of aniline over catalyst DH-1 to synthesize diphenylamine has been studied .

对苯胺在DH 1催化剂上合成二苯胺的反应规律进行了研究。

The synthesis of diphenylamine from aniline-phenol by liquid phase condensation in the presence of Pd/C catalyst was studied.

研究了在Pd／C催化剂存在下，通过液／固催化缩合反应由苯胺和苯酚合成二苯胺的方法。

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。