查询词典 catalytic

Catalytic activities of phosphotungstic acid for liquid-phase nitrations of benzene,toluene and chlorobenzene were studied.

研究了磷钨酸对苯、甲苯和氯苯液相硝化反应的催化活性，考察了反应温度、反应时间、硝酸与芳烃摩尔比对芳烃转化率和产物选择性的影响。

The graft copolymer could exhibit good emulsifying property, good phase transfer catalytic property, moderate water absorbency and oil resistance. The graft copolymer could be used as a compatibilizer in the blending of SBS and chlorohydrin rubber. Scanning electron microscope confirmed the improved compatibility of the two phases.

接枝共聚物呈现良好的乳化性能、相转移催化性能和一定的吸水性和耐油性；其作为增容剂能增强SBS与氯醇橡胶的相容性，并用扫描电镜给予了佐证。

The chloromethane -containing waste gas was treated by catalytic oxidation process and the affecting factors were studied.

用催化氧化法处理氯甲烷废气，考察了各种因素对催化氧化处理效果的影响。

Experiments showed that catalytic activity of magnetic solid superacids could attain above 97%, and selectivity of reaction 100%, which illustrated the choiceness of these catalysts in esterifications.

实验表明，磁性固体超强酸催化剂的催化活性可达97％以上，反应的选择性为 100％，说明此催化剂是良好的酯化催化剂。

The effects of water content and the added amount of triethylamine on peptide synthesis by immobilized enzyme were different from that of free enzyme. The catalytic efficiency of immobilized enzyme was better than that of free enzyme in most cases. The reuse times of immobilized α-chymotrypsin on MCM-22 are about 4-5 times.

结果表明，有机溶剂中含水量、三乙胺的加入量对自由酶与固载化酶的影响程度不同；多数情况下固载化酶的催化效果优于自由酶；吸附固载化酶的重复使用次数有限。

AIM: To synthesize 2 novel chiral ligands derived from cinchona alkaloids and study their catalytic performance in asymmetric dihydroxylation of 5 olefins.

目的：合成两种新的金鸡纳生物碱类衍生物配体并将其用于催化五种烯烃的不对称二羟化反应，考察催化效果。

The reported organocatalyst for asymmetric Mannich reaction include proline derivatives, chiral phosphoric acids, chiralurea derivatives, cinchona alkaloids and so on, which can catalyze the asymmetric Mannich reaction with high catalytic activity and excellent enantiselectivity.

本文评述了各类有机催化剂在有机催化不对称Mannich 反应中的应用研究进展，以及不对称诱导反应的机理、催化剂分子结构及反应条件对其催化活性和不对称诱导作用的影响。

The method of catalytic synthesis of benzyl cinnamate with hexadecyl trimethyl ammonium chloride as phase transfer catalyst is studied.

以十六烷基三甲基氯化铵为相转移催化剂催化合成肉桂酸苄酯，考察了催化剂、温度、时间和物料配比等因素对反应的影响。

Study on catalytic synthesis of n-butyl cinnamate with lanthanum methanesulfonate

以正辛醛和乙二醇为原料，甲基磺酸镧为催化剂，合成了正辛醛缩乙二醇。

The tattle unifies in recent years study on the synthesis of cinnamate of the status quo and application prospect,the use of activated carbon as carrier of phosphotungstic heteropoly acid catalyst for catalytic synthesis of cinnamic acid ester had a preliminary inquiry,and the results were satisfactory.

中文摘要：本文结合近几年合成肉桂酸酯的研究现状及应用前景分析，采用磷钨杂多酸作催化剂活性炭为载体催化合成肉桂酸系列酯进行了初步探究，并且结果令人满意。

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％。