查询词典 catalyst

There were hundreds of catalysts from the first single inorganic acid to current heterogeneous catalysts such as metallic oxide, heteroatom molecular sieve and heteropoly acid catalyst.

目前已见报道的催化剂已不下百种，其发展过程从最初单一的无机酸和无机盐类催化剂，发展到非均相的金属氧化物、杂原子分子筛、杂多酸盐催化剂等。

The Catalyst used for preparation of carbodiimide from condensation of isocyanate were reviewed in this paper, including phosphorus-containing heterocycle compounds, phosphonate,organic metal compounds and polymer-grafting solid catalysts.

综述了异氰酸酯缩合生成碳化二亚胺催化剂的开发现状，包括磷杂环化合物、磷酸酯类化合物、金属有机化合物、聚合物接枝固相催化剂4大类。

Carbon hollow nanosphers were synthesized at 200oC, using magnesium and hexachloroethane as reactants, aluminum chloride as catalyst and benzene as solvent.

采用格氏试剂法，在温度200℃，反应时间12个小时下，以六氯乙烷为原料，苯为溶剂，铝作还原剂，无水氯化铝为路易斯酸。

Using Hexamethylenetetramine as the catalyst and P-Hydroxyanisole as the inhibitor, glycidyl methacrylate were prepared by two-step method successfully.

本论文以六次甲基四胺为催化剂，对羟基苯甲醚为阻聚剂，采用酯化闭环两步法制备出甲基丙烯酸缩水甘油酯。

The optimum reaction conditions are obtained by orthogonal exptl. design; ring-opening reaction:n:n = 1:1.3, Hexamethylenetetramine catalyst 0.7%,reaction temp. is 80℃, reaction time is 7 h, and concentration of inhibitor is 0.3%. ring-closing reaction : n:n=1:0.9, reaction temp. is 40℃, reaction time is 5 h.

通过正交设计确定了最佳工艺条件为：开环反应：六次甲基四胺用量0.7%(占反应物总量的质量百分比)，阻聚剂用量0.3%(占反应物总量的质量百分比)，ECH：MAA的摩尔比为1.3：1，温度80℃，反应时间7h ；闭环反应：氯醇酯： NaOH的摩尔比为1：0.9，反应温度40℃，反应时间5h。

Using inorganic aluminous salts as precursors and hexamethylenetetramine as the catalyst, alumina nanonpowder was fabricated by sol-gel procedure and then incorporated in the preparation of body batch for thickly-glazed, thin-bodied celadon wares.

以无机铝盐为先驱体，六次甲基四胺为催化剂，采用溶胶－凝胶法制备了纳米氧化铝粉体，将纳米氧化铝粉体应用于薄胎厚釉青瓷瓷胎中，研究了粉体对青瓷瓷胎的增强作用。

The thermal decomposition of hexogen (cyclotrimethylene-trinitramine) has something to do with the burning performance of propellant. Addlition of a little catalyst was an effective method of adjusting the burning performance of propellant.

黑索金的热分解特性与推进剂的燃烧性能密切相关，添加少量催化剂是调节推进剂燃烧性能的有效方法。

The influence factors such as molar ratio of hexyl alcohol to propionic acid,amount of catalyst, and reaction time on the yield of hexyl propionate were discussed.

以钨硅酸为催化剂，通过丙酸和己醇反应合成了丙酸己酯，探讨了醇酸物质的量比、催化剂用量及反应时间对酯化率的影响。

By using sodium bisulfate as the catalyst, hexyl hexanoate was synthesized.

采用硫酸氢钠为催化剂合成了己酸己酯，考察了催化剂用量、醇酸物质的量比、反应时间、带水剂用量及催化剂重复使用次数等因素对收率的影响。

And then the title compound was synthesized through reacting of 5-fluorouracil with hexyl isocyanate in the presence of 4-(N,N-diethylamino)pyridine as catalyst.

以正庚酸、氯化亚砜和叠氮化钠为原料，通过酰化、库尔提斯重排反应制备异氰酸己酯，然后在4吡啶催化下与5氟尿嘧啶缩合得到抗癌药物卡莫氟，总收率75.4%。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。