查询词典 catalysts

In a similar manner to reaction centres in natural photosystems, molecular2 and metal oxide3 catalysts have been used to photochemically oxidize water.

以往，研究人员使用太阳能电池板产生的电力来分离水分子，但麻省理工学院的研究人员直接使用太阳光来制取氢。

The photoisomerization reaction of norbornadiene to form quadricyclane was carried out in a photoreactor in order to study the effects of the structure of the catalysts on their catalytic activity.

制备了Zn掺杂TiO_2、La掺杂ZnO/TiO_2、Ti-MCM-41和MCM-TiO_2催化剂，利用XRD、BET、TEM、XPS、DR UV-vis、FT-IR、N2吸附-脱附等技术对催化剂进行了表征，在光反应器中进行了降冰片二烯异构化生成四环烷的反应，研究了制备方法对催化剂的结构和性能的影响规律。

Emphasis analyzed,researched and estimated pinacol rearrangement actions,catalysts,reaction machine,related some reaction formulae etc,and characteristic,regulation relative with migration groups and more uses.

重点分析、研究和评述了频呐醇重排的作用、所用的催化剂、反应机理、相关的一些反应式、与迁移基团相关的重排特征和规律以及其较多的应用等，也论及了反频呐醇重排反应恰好是频呐醇重排的逆过程。

The rhythmic hydrogenation reaction of piperylene C5 petroleum resin produced by Fushun Zhengchuan chemical plant was carried out by using the laboratory made catalysts that load of palladium is 1.0%, load of other metals is 1.0%. The best hydroprocessing conditions are:reaction temperature is 270 ℃, reaction pressure is 3.0 MPa, reaction time is 4 h.

采用含钯质量分数1.0%，其他金属质量分数1.0%的自制催化剂对抚顺市正川化工厂生产间戊二烯C5石油树脂，在高压釜中进行间歇加氢，最佳工艺条件为：反应温度270℃，反应压力3.0MPa，反应时间4h。

In an embodiment, the selective hydrogenation catalysts of this disclosure are used in the hydrogenation of highly unsaturated hydrocarbons such as for example and without limitation acetylene, methylacetylene, propadiene or combinations thereof.

在实施方案中，本公开的选择性加氢催化剂被用于高度不饱和烃的加氢中，其中所述高度不饱和烃例如但不限于乙炔、甲基乙炔、丙二烯或它们的组合。

This dissertation consists of two main parts: The first is a systematic study of the selective catalytic reduction of nitrogen monoxide with propene over tin containing oxide catalysts.

本论文分为两部分，第一部分是一氧化氮在氧化锡基催化剂上的选择还原消除；第二部分是耐高温大比表面氧化物的制备。

As a key step of the synthesis, the Friedel-crafts acylation was researched. And the optimal operation variables were determined through orthogonal experiment: when 0.lmol acetanilide, 0.26mol aluminum chloride, 0.12mol propionyl chloride and 200ml carbon disulfide are introduced, and the reaction time is 5 hour, the yield can be up to 57.3%. The solid super acid catalyst was preliminary studied. Four solid super acid catalysts were prepared to take the place of aluminum chloride, and it was indicated that AlCl3 acidic resin can better catalyze the Friedel-Crafts reaction of acetanilide.

对合成路线中的Friedel-Crafts酰基化反应进行了研究，运用正交实验设计确定了最佳工艺条件：当乙酰苯胺用量为0.1mol时，AlCl_3用量为0.26mol、丙酰氯用量为0.12mol、溶剂用量为200ml、反应时间为5h，产率可达到57.3％；对于固体超强酸催化剂进行了初步研究，合成了四种催化剂，其中负载AlCl_3强酸性树脂对于乙酰苯胺的Friedel-Crafts酰基化具有一定的催化活性。

It is discovered that isomerization of 2,10-epoxypinane produce mainly perillyl alcohol in 353 ~ 363 K catalyzed by acid catalysts in strongly polar protonic solvent.

结果表明：在酸催化剂存在下，强极性非质子溶剂中，2，10-环氧蒎烷于353-363 K可定向重排生成紫苏醇。

Bulk Molding Compound is a thermoset plastic resin blend of various inert fillers, fiber reinforcement, catalysts, stabilizers, and pigments that form a viscous,'puttylike' compound for compression or injection molding.

团状模塑料是一种热固性塑料，其中混合了各种惰性填料、纤维增强材料、催化剂、稳定剂和颜料，形成一种用于压塑或注塑的胶粘&油灰状&复合材料。

Two zeolite catalysts,ZSM-5 and ultrastable Y-type,were used in a two-staged fixed bed reactor to pyrolyze waste tyre.

采用ZSM-5和超稳Y分子筛催化剂，利用两段法固定床研究废旧轮胎的催化热解。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐