查询词典 catalytic

Iron-based perovskite-type compounds modified by Cu, Zn, Ni were prepared through sol-gel process to investigate their catalytic activities of NO direct decomposition. XRD analysis reveals that the samples calcined at 750℃ are pure perovskite phase.

采用溶胶－凝胶方法合成了Cu，Zn，Ni改性的钙钛矿复合氧化物系列催化剂。X射线衍射分析表明，750℃焙烧的此类催化剂在掺杂范围内均具有钙钛矿基本结构。

Under the experimental conditions, the evaluation of catalytic activity on direct decomposition of NO show that the presence of Cu is necessary for improving activity at 600~800℃ among La0.9Ce0.1Fe(subscript 0.8-x)Co0.2YO3(Y=Cu, Zn, Ni) series, and in which L.a0.9Ce0.1Fe0.7Co0.2Cu0.1O3 has the highest activity, the conversion of NO decomposition maintains 80% and nearly 100% at 750℃. H2-TPR result proves that the higher activity is related to the mobility of lattice oxygen which is beneficial to the reproduction of active site for NO decomposition.

在实验条件下，对NO的活性测试结果表明，L0.9Ce0.1Fe(下标 0.8-x)Co0.2YO3(Y=Cu， Zn， Ni)系列催化剂在600~800℃范围内，掺杂Cu的复合氧化物具有较高的催化分解活性，其转化率始终保持在80%以上，反应温度为750℃时，几乎100%转化。H2-TPR结果证明，其催化分解活性高的原因是Cu的掺入使晶格氧活动性增强。

Tang Wen-Xia In order to find out the relationship between the structure and function of copper/zinc superoxide dismutase, and elucidate mechanism of the catalytic dismutation of 〓, we have designed and synthesized two new model compounds of Cu, Zn-SOD, and studied relationship of their structure, properties and biological activity.

为了阐明Cu，Zn-SOD酶活性中心结构和功能的关系，探讨其催化〓歧化作用机理，本文设计并合成了两种不同结构的Cu，Zn-SOD模型化合物及一系列有关化合物，对它们进行了深入研究。1。

Since the dismutation of superoxide radicals by SOD is a reaction that is rate-limited by diffusion and enhanced by electrostatic guidance, all these structural features may be related to GP-MnSOD's high catalytic activity: first, Lys38 may increase the effective enzyme-substrate association rate by enhancing the electrostatic gradient at its substrate channel; second, an excess of acidic over basic residues makes the negative surface potential of GP-MnSOD more larger than those of other known MnSODs. This may enhance the reaction rate by reducing futile collisions of superoxide radicals with GP-MnSOD's surface.

因此，GP-MnSOD的上述结构特征可能与GP-MnSOD的较高酶活有关：首先，Lys38增加了底物通道口的正静电势梯度，从而可能促进了GP-MnSOD的活性中心与底物的有效结合速率；其次，GP-MnSOD表面覆盖的过量酸性残基使得它比其它MnSOD在底物通道以外的蛋白表面更多地被负静电势所覆盖，这可能有效地减少了超氧阴离子与GP-MnSOD表面的无效碰撞，从而提高了反应速率。

Under the catalytic reaction of Sn 2-ethyhexanoate (ZnOct2), lactic acid was used to synthesize DLLA in the experiment.

文中以D，L-乳酸为原料，在催化剂辛酸亚锡(ZnOct2)的作用下，合成DLLA。

As a matter of fact, K promoter was used more frequently as a doper economically. 4. It was observed that K component appears to enhance the selectivity of C2+OH significantly with the lower catalytic activity simultaneously.

由于碱金属K对催化剂表面的电子修饰作用，K改性的CuZrO_2催化剂具有较高的高级醇选择性；同时，抑制副产物烃类的生成。

The initial water concentration of the mixed solvent is an extremely important factor.Due to the complex double effects of water on the reaction, with the change of the initial water concentration,the catalytic activity shows complex changing trend.

混合溶剂的初始含水量是一个极为重要的因素，由于水对反应复杂的双重影响，催化剂的活性随初始含水量的变化呈现出复杂的变化趋势。

Four kinds of arrangement of catalyst support in catalytic distillation column are introduced, they are catalyst in the downcomer of plate column,catalyst on the tray and catalyst combined with random packing or structured packing respectively, and their advantages and disadvantages are also analyse

介绍了催化蒸馏塔中催化剂的装填结构，即催化剂装在板式蒸馏塔降液管中、装在板式塔塔板上、与散装填料相结合及与规整填料相结合，并对这些装填方式的优缺点进行了分

Cyclophos phamide joined the desiccant to ink has a strong catalytic effect, usually join drying oil content of 17%, when using the drier with needs in order to avoid conjunctuval.

加入干燥剂对油墨层有很强的催干作用，通常加入干燥油含量17％左右，使用干燥剂时现用现配，以免结膜。

Moreover, aptazymes as catalytic molecular beacon provide a new orientation for the quantitative analysis of effector molecules.

适体酶作为催化分子信标，为效应分子的定量分析提供了新的思路。

Nowadays, most of research are to build a transmutative Petri Nets through adding controlling place sets, controlling arc sets and controlling policy to the basic Petri Nets, while the Controlled Petri Nets could be used to argue many controlling theory problems conveniently and to induce many logically and physically supervisory and solve the Event Feedback Controlling Problems and State Feedback Controlling Problem in DEDS supervisory theory.

目前大多数的研究表现为在变形后的受控Petri网基础上，利用各种方法求得各种逻辑型、结构型控制器，解决DEDS监控理论中的事件反馈控制问题与状态反馈控制问题。

On one hand, there are discussions with the works council and union about extension of short time working up to the end of September.

一方面，有讨论，工程理事会和联盟关于延长工作时间短至9月底。