烯烃

The epoxidation of of various olefins was carried out using LDH-F with Mg/Al=5 as the catalyst and H2O2 and benzonitrile as the oxidants. This catalytic system has excellent catalytic activity. The conversion and selectivity are both above 95% when using styrene, indene, allyl alcohol, and allyl chloride as the substrates.

以Mg/Al=5的LDH-F为催化剂，H2O2和苯甲腈为氧化剂对不同官能团化烯烃进行环氧化反应，结果表明，此催化体系具有良好的催化性能，在苯乙烯、茚、丙烯醇和烯丙基氯环氧化反应中转化率和选择性均在95%以上。

In the catalytic pyrolysis process, the summary yield of ethylene, propylene and butylene reaches 51. 54wt%, indicating the prospective future for application of downer reactor in this process.

此外，下行床催化热裂解过程中的乙烯、丙烯和丁烯三种烯烃的总收率达到51.54wt％，显示出了良好的研究开发前景。

Properly selected reaction temperature can suppress the secondary reactions and enhance the production of propene and ethene.

以MCM-49分子筛为催化剂，纯1-丁烯为原料，考察了反应温度对烯烃催化裂解制丙烯、乙烯反应性能的影响。

Catalytic cracking process for production of propylene and ethene from 1-butene was investigated using MCM-49 zeolite.

以MCM-49分子筛为催化剂，纯1-丁烯为原料，考察了反应温度对烯烃催化裂解制丙烯、乙烯反应性能的影响。

In particular, the production of propylene and other important olefins via olefin metathesis reaction from n-butenes feedstock has received considerable attention.

特别是在利用正丁烯生产丙烯和其它重要单烯烃方面，复分解反应受到越来越多的重视。

In particular, the production of propylene and other important olefins via olefins metathesis reaction from n -butenes feedstock has received considerable attention.

特别是在利用正丁烯生产丙烯和其它重要单烯烃方面，复分解反应受到越来越多的重视。

Increasing the conversion of olefin,promoting the cracking reaction and...

提高烯烃的选择性转化、促进裂化反应并提高丙烯产物的选择性，有利于提高丙烯产率。

Based on studies of RCM reaction of 50 and CM reaction ofacrylonitrile with 1-octene or 1-decene catalyzed by pyridine derivative-coordinatedruthenium benzylidene complexes, it can be concluded that ruthenium benzylidene complexwith the more labile dissociating ligand exhibits the higher initial activity and better catalyticperformance.

吡啶衍生物配位的钌卡宾配合物催化含氰基烯烃50闭环交互置换反应和丙烯腈与1-辛烯、1-癸烯交叉交互置换反应表明，催化剂中吡啶衍生物配体越易解离，其初活性越高，催化活性越好。

The results show that isobutene oligomerization is fast liquid-solid reaction. Under the temperature of 80 ℃～120 ℃ and pressure of 2.0 MPa, the products of oligomerization are mainly dimers and trimers of isobutene. The yield of trimers is higher than that of dimers and the mass fraction of trimers decreases with reaction temperature increasing. The yield of tetramers is much lower than that of dimmers and trimers. The tetramers are formed by reaction of isooctenes and C8 carbonium ion.

结果表明，异丁烯齐聚反应为快速液固相催化反应，在80 ℃～120 ℃，2.0 MPa的实验条件下，反应产物主要是异丁烯的二聚物和三聚物，且三聚物的收率远高于二聚物，两者的浓度比值随反应温度的升高而下降；少量四聚物的生成主要源于碳八烯烃与碳八正碳离子的反应。

The correlation coefficients between 0X, 1X, 0X(superscript ' subscript D), 1X(superscript ' subscript D) and boiling points for 80 alkenes, 39 alkynes and 169 aliphatic unsaturated hydrocarbons were made, which were 0, 999 3, 0, 999 6, 0. 995 5, respectively and better than those of the famous Kiers index (superscript mX.

其逆指数0阶、1阶指数0X(下标 D，1X，0X，1X分别与80个单烯烃、39个单炔烃、169个不饱和烃的沸点进行相关，复相关系数依次为0.9993，0.9996，0.9955，均优于著名Kier指数(上标 mX的回归结果。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。