查询词典 catalyst

Comparing the two kinds of catalyst, although the high conversion could been gotten at the optimum reaction conditions respectively, to the same conversion, the reaction conditions for ammonium molybdate catalyst were higher than that for sodium tungstate catalyst, that means the catalytic activity of ammonium molybdate is higher than that of sodium tungstate.

两种催化剂相比，虽然在最佳工艺条件下，均可使反应达到较高的转化率，但达到相同转化率时钨酸钠催化剂所需的反应条件比钼酸铵催化剂高，所以总体来说，钼酸铵催化剂的反应活性高于钨酸钠催化剂。

The technological condition of preparation of mesh TiO〓/Ti catalyst was optimized by means of XRD and SEM with the analysis of effects of dyes photoelectrocatalytic degradation. The diameter of TiO〓/Ti catalyst particle was nanometer level The effects of bias voltage and light intensity on the process of photoelectrocatalytic oxidation, the adsorption property of electrode surface, the extent of mineralization of rhodamine B and rose bengal were investigated using mesh TiO〓/Ti as catalyst of photoelectrocatalytic oxidation system.

利用拉曼光谱和XRD等测定手段并结合染料的光电催化降解效果的分析，优化了丝网TiO〓／Ti催化剂制备的工艺条件，研制出高效丝网纳米级TiO〓／Ti催化剂，并将该催化剂用于光电催化氧化体系，研究了氧化体系中外加偏压、光强等因素对光电催化氧化过程的影响以及催化剂的表面吸附性能、染料若丹明B和虎红在光电催化氧化过程中的矿化程度。

It may effectively reduce the HC emissions to use a catalyst with low light-off temperature, close-coupled catalyst, HC traps , second air injection and electrically heated catalyst.

采用如低起燃温度催化剂、密耦催化剂、HC 捕集器、二次空气注入和电加热催化剂等在内的排气后处理技术，可以有效地减少污染物尤其是HC的排放。

This catalyst system was applied in the cyclopropanation of other alkenes, and the results indicated that the catalyst system excelled mono-catalyst.

将这个催化体系用于其他烯烃的环丙烷化，结果表明，协同催化效果优于单一催化体系。

The coupling reaction of aryl iodides, bromides and chlorides with differentolefins catalyzed by catalyst 2 and 4 was studied. It was found that compounds 2 and 4 anchored on active carbon are efficient catalyst for the Heck reaction in the case of aryl bromides and aryl chlorides as substrates (Scheme 3). It is notable that catalyst 4 has higher efficiency for aryl chlorides.___^H Cat.2 or 4, Base HXSolution, 100C or 140

以化合物2和4为代表，重点研究了活性炭负载的二茂铁亚胺环钯化合物催化碘代苯、溴代苯和氯代苯与活泼烯烃之间的偶联反应(Scheme 3)，发现活性炭负载的二茂铁亚胺环钯化合物2和4均可用于催化多种溴代和氯

The replacement of toxic and volatile organic solvents as reaction media or an efficient catalyst with environmentally acceptable alternatives are an area of tremendous importance in modern organic synthesis. Basing the review about solid-phase synthesis with simple separation, the liquid phase organic synthesis supported by the solution polyethylene glycol and the chemical reactions in the medium of PEG, herein we are going to study the synthesis of 1-amidoalkyl-2 -naphthols in presence of the solution catalyst or the solid catalyst and the synthesis of thiourea in PEG-400 medium.

难溶性载体试剂参与下的固相合成使分离操作简单易行；可溶性聚乙二醇支载下的液相合成显示出液相反应的稳定高效性，同时兼顾大分子聚合物容易沉降分离的优点；无毒且稳定的小分子PEG作为反应介质，往往表现出醚和醇的双重性质和功能。

With the increase of catalyst dosage, the desulfurization rate decreased using zinc oxide or manganese carbonate as oxidation catalyst, but first increased and then decreased using boric acid as the catalyst.

使用氧化锌或碳酸锰催化剂时，随着催化剂用量的增加，汽油脱硫率总体呈现降低的变化趋势。

The test results for the commercially scaled-up catalyst showed that its preparation technique was well-proven with good repeatability; catalytic properties of the catalyst attained those of laboratory-prepared catalyst.

FC-28型单段高中油型加氢裂化催化剂工业放大结果表明，该催化剂制备工艺成熟可靠，重复性好，FC-28型放大催化剂的反应性能完全达到了实验室定型催化剂的水平。

When catalyst was prewetted with low sulphur content prewetting oil after activation, one kind of sulphur was adding into the prewetting oil in order to reduce too much sulfur loss from catalyst surface, and advanced catalyst prewetting and start-up methods were developed for reaching its higher performance.

由于活化后的预润湿过程中，所用润湿液中不含硫，为防止润湿过程中催化剂上硫的流失，因此在催化剂的润湿过程中，同时对催化剂进行硫化，根据以上原因，制定了科学合理的催化剂硫化、润湿及开工投料方案，确保催化剂的优越性能能够得到充分发挥。

The experimental research on the EAF probability density has shown that the emission characteristics of gasoline engine can be defined by the probability density, which has correspondent relations with catalyst efficiency index. The catalyst efficiency can be predicted through the calculation, so it is useful to the catalyst application.

过量空气系数概率密度的试验研究表明以概率密度对汽油机排放特点进行量化，通过它和催化转化器综合效率指数的关系，推测催化转化器效率情况，对匹配研究具有指导意义。

Foods high in this vitamin include oily fish such as salmon, tuna and, and fish liver oils.

维生素D含量高的食物包括诸如大麻哈鱼、金枪鱼和鲭鱼之类的油鱼以及鱼肝油。

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我们需要您cosign我们的公共信，要求记者立即停止恐吓，并要求所有收费下降。