查询词典 deactivation

Deactivation and regeneration of QZ-2000 catalyst for alkylation of benzene and propylene to synthesize cumene were studied.

对苯和丙烯烷基化反应合成异丙苯的QZ-2000烷基化失活催化剂进行了失活原因及再生条件的研究。

The deactivation rates of penicillin amidase in both systems follow the first-order model. The inactivation rate constants increased gradually and α decreased slightly, with the increase of temperature.

随着温度的升高，失活速率常数k〓和k＇〓逐渐增大，α略有所降低；当体系温度相同时，该酶在反胶团中的k〓值比水溶液中的k＇〓小。

Then, we research the physical and chemic techniques in detail, and analyze the deactivation of the catalyst in use of our test system at present.

随后文章对理化分析技术进行了系统的介绍，并在现有排放测试体系基础上，运用理化分析技术对催化转化器的失效进行了多方位的分析。

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 process of preparing sterilizing granule capable of generating chorine dioxide in one package includes the following steps: preparing activating agent; mixing inorganic salt and nickel acetate, re-crystallization, sieving and deactivation; sieving and deactivating solid acid; mixing with inorganic salt; mixing sodium chlorite and cobaltous chloride, re-crystallization, sieving and deactivation; and mixing the activating agent with sodium chlorite.

一种可发生二氧化氯的一元包装消毒颗粒制备方法，其特征是制备活化剂：将无机盐加入醋酸镍，经过重结晶后，筛分、钝化处理；将固体酸进行筛分、钝化处理；然后与无机盐进行混合；在亚氯酸钠中加入氯化亚钴后，经过重结晶、筛分、钝化处理；将上述活化剂和亚氯酸钠均匀混合即成。

Progress in research of catalyst deactivation in ethylbenzene dehydrogenation was reviewed.Active phase of the catalyst was briefly analyzed.Five main reasons for the catalyst deactivation were discussed,including coke deposition,loss and redistribution of potassium promoter,change in oxidation state of iron,structural transformation of the catalyst,and the catalyst poisoning.

对乙苯脱氢制苯乙烯催化剂失活的研究进展进行了综述，分析了催化剂的活性相，分别探讨了积碳、钾的流失与重新分布、Fe3+的还原、催化剂物理结构的变化和中毒等5个因素对催化剂失活的影响及其失活机理，其中，钾的流失和Fe3+的还原是造成催化剂失活的重要因素。

The effects of increasing the stereospecilicity is due to deactivation of different selectivity for both atactic and isotatic active centers and the deactivation of atacitic active centers is much greater than that of isotactic active centers.

EB、DIBP和TMP用作Din的效果则各不相同。烷氧基硅烷等Dex提高等规度的作用是由于它们选择性地使无规活性中心失活大大高于等规活性中心。

The reasons of deactivation of the catalyst were further studied:(1)At high temperature, the deactivation was resulted from crystallization, and its deactivation process was unreversible.

通过上述研究工作，制备出了一种新型高效苯加氢催化剂，同时，本论文中关于催化剂失活现象的研究，对提高催化剂的稳定性及其在工业上的应用具有较好的参考价值。

The characterization of the coked catalyst shows that the deactivation of catalysts is caused by a jam of bulkier molecules, which are the alkylbenzenes from both reactants and products, so the deactivation cannot be avoided.

苯与长链烯烃的烷基化反应过程中，β沸石催化剂的失活是由于产品直链烷基苯本身和原料中带入的杂质芳烃逐渐堵塞孔道、阻止了反应物分子接近活性中心引起的，是由晶内开始逐渐向外发展的。

The coking and deactivation process of benzene and ethylene alkylation reaction over AB-97 zeolite has been studied systematically. The results of acceleration deactivation reaction indicate that deactivation process go through three phases, high level activity stability period, activity decline period and low level activity stability period. The mechanism of this phenomenon was analyzed by the way of the experiment research of pore structure and acid quality of coked zeolite. It is concluded that reducing the strong acid active centers and crystal outer-surface active centers are benefit to improve the activity stability of zeolite.

在AB-97型分子筛催化剂上对苯/乙烯烷基化制乙苯反应体系的结焦失活历程系统实验研究，催速失活实验结果表明失活历程经历高水平活性稳定期，活性衰退期和低水平活性稳定期三个阶段，并通过对失活催化剂的孔结构及酸性质的实验研究，对这一现象进行了机理分析，认为催化剂改性研究中采用降低强酸活性位和晶粒表面活性位这两种手段都有利于改善催化剂的活性稳定性。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。