查询词典 catalyst

Simultaneously, we proposed the working model of assembled dendritic catalyst for HDA reaction of Danishefsky's diene with aldehydes.

同时也考察了Dendrimer取代基的大小、位置对产物收率与对映选择性的影响，结果发现L〓系列表现出较明显的Dendrimer效应。

The results showed that, both diene and alkaline nitrogen-containing compounds had negative influence on the aromatization stability of the catalyst.

用小型固定床加压反应器研究了液化石油气（C4 LPG）中的丁烯在纳米ZSM-5型催化剂DLG-1上的低温芳构化反应，重点考察了原料中二烯烃和碱性氮杂质，以及反应温度、压力和C4 LPG进料重量空速条件对催化剂芳构化反应活性及稳定性的影响。

Selective hydrogenation ; Nickel catalyst ; FCC light gasoline ; Diene

选择性加氢；镍催化剂；催化裂化轻汽油；二烯烃

In addtion, the β-diketone compound of Ti is complexed with late transition metal Co, Ni complex to furtherly modify the catalytic ability of the catalyst system.

利用配位配体来调节催化剂的催化性能是烯烃聚合催化剂设计和合成的基本思路和重要途径之一，是开发新型功能性聚烯烃材料的重要方法。

In this dissertation, the more denoting β-diketone ligand is used to weaken the electrophilic property of Ti center to obtain a complex for use as a catalyst precursor to polymerize ethylene, vinyl pyridine and acrylonitrile.

如何通过化学或物理化学方法来调节活性中心与非极性烯烃、活性中心与极性单体这两者之间的性能差异，使之同时能适应两类单体聚合无疑是很重要的。

At first by reaction of TiCl〓 with β-diketone (acac: acetylacetone, facac: 1, 1, 1-trifluoroacetylacetone) ligand to yield two kinds of Ti (β-diketone)〓Cl〓, then they are complexed proportionally with Co 〓 or Ni 〓 through different method to get two-metal catalyst precursors.

另外采用具有不同性能两种或多种金属催化剂复合制得催化剂，使其具有多活性中心的综合性能，发挥各金属活性中心的协同作用，已经在聚烯烃的研究工作中深入开展。

The effect on polymerization reaction and polymer with the catalyst system is systematacially studied in this paper, and the polymerization kinetics of butadiene is determined by dilatometer method.

本文系统的研究了该催化剂体系对聚合反应及其产物的影响，以膨胀计法测定了丁二烯聚合反应动力学。

In contrast, dimerization and trimerization of NaH2PO4 are predicted to be the predominant initial reactions for the silica supported NaH2PO4 catalyst.

但是在硅胶负载的磷酸二氢钠上，磷酸二氢钠的二聚和三聚是缩合反应初始阶段的主要反应。

The results show that the ionic liquid Et〓NHCl-AlCl〓 is an effective catalyst for the dimerization.

研究的结果表明，Et〓NHCl-AlCl〓是二聚反应的高效催化剂，反应无需加热且在无溶剂条件下得到的主要产物为环状二聚物1，1，3-三甲基-3-苯基茚满，反应在80℃、进行5min即可达到转化率100％、茚满的选择性为97.3％。

In contrast,dimerization and trimerization of NaH_2PO_4 are predicated to be the predominant initial reactions for the silica supported NaH_2PO_4 catalyst.

但是在二氧化硅负载的磷酸二氢钠上，磷酸二氢钠的二聚和三聚是缩合反应初始阶段的主要反应。

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。