催化的

Because the condition is serious, the catalyst may be malfunction. In this condition, we analyze the deactivation by use of the physical and chemic techniques.

但在长期使用过程中，由于工作环境的恶劣，常常导致催化器的失效，研究催化器的失效状况，对于控制在用车排放有着重要意义。

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。

At the end of this chapter, the research object and content of this paper are also described concretely.

对所得系列的催化剂的催化活性进行了评价，筛选出了催化活性较高的Zn-Cr系列催化剂。

The cis novel bisoxazoline ligands L1-L4 have been synthesized through the treatment of new cis dihydroxy diamide with p-toluenesulfonyl chloride in the presence of catalytic quantity of 4--pyridine, and the cis dihydroxy diamide could be achieved from the condensation of the amino alcohols and cis cyclopropane dicarbonyl chloride prepared via oxidation and halogenation from cis-2,2-dimethyl-3-formylcyclopropanecarboxylate with DCC.

我们以蒈醛酸内酯为起始原料，经过氧化反应、酰氯化反应得到顺式环丙烷二酰氯，然后在二环己基碳二亚胺的催化下与相应的氨基醇反应合成了顺式二羟基酰胺，再用对甲苯磺酰氯将羟基活化，最后在二甲氨基吡啶的催化下关环合成顺式双噁唑啉配体L1～L4。

NO elimination reactions are much complicated in the system of NO-CO-CO2-N2 with the existence of metallic oxides. Homogeneous reaction between NO and CO, reduction of NO by the lower valued metallic oxides, direct decomposition of NO as a catalytic reaction and catalytic reaction of NO/CO may all contribute in NO elimination.

金属氧化物存在条件下NO-CO-CO2-N2体系中，NO去除反应较为复杂，NO/CO气相直接反应、低价氧化物对NO的还原作用、金属氧化物对NO分解反应的催化作用及金属氧化物对NO/CO反应的催化作用等都可能存在。

Influences of reaction temperature and space velocity on distribution and composition of the products were investigated.

我国车用汽油的85%来自催化裂化过程，催化裂化汽油在没有采取任何措施或工艺时烯烃的体积分数一般高达40%～60%，远高于35%的汽油新标准。

Using cobalt chloride and ferromanganese as precursor of cobalt-based catalyst, the performance of the catalyst for hydroformylation of cyclohexene was studied.

以氯化钴和锰铁合金粉为钴基催化体系的前驱体，研究了该催化剂体系对环己烯氢甲酰化反应制备环己烷基甲醛的催化性能；并考察了溶剂、温度、压力等反应条件的影响。

In the aspect of the photocatalytic activity, we did some experiments and tests: TiO_2 hydrosol degradated methyl orange, TiO_2 powder degradated acetone, TiO_2 films degradated formol and TiO_2 films degradated methyl orange, confirming that the as-prepared sample possessed preferable photocatalytic activity.

在光催化活性方面，测试了TiO_2水溶胶降解甲基橙、TiO_2粉末降解丙酮、TiO_2薄膜降解甲醛和TiO_2薄膜降解甲基橙的实验，证实了所制备的试样具有较好的光催化活性。

The experimental results show thatβ-MnO_2 nanorods has the highest activity among them and allows the decoloration degree of the fuchsin acid solution to reach 97.6% within 60 minutes.

以所制备的纳米结构锰氧化物为催化剂，研究了它们对H_2O_2氧化降解酸性品红模拟废水的催化性能。其中β-MnO_2纳米棒的催化活性最高，反应60min后酸性品红脱色率即达到97.6％。

The photocatalytic behavior of such prepared nano-Cu2O was evaluated by the decomposition of acidic fuchsine solution under daylight. The influence of glucose addition and the initial concentration of acidic fuchsine solution as well as the catalyst reusability were examined.

用它做催化剂在日光作用下对酸性品红溶液进行了光催化降解实验，研究了葡萄糖添加浓度、酸性品红溶液的初始浓度和催化剂的重复使用对光催化性能的影响。

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％。