查询词典 catalysts

The catalytic combustion of hydrogen cyanide was studied separately in presence of two kinds of noble metal catalysts,i.

考察了一元铂与二元铂铑两种贵金属催化剂对氰化氢的催化燃烧效果，探讨了温度、氰化氢浓度、空气含量及气体空速等因素对脱除氰化氢的影响。

Reaction mechanism for 11,1,2-tetrafluoroethane preparation is carried out through gas phase fluorination by hydrogen fluoride over chromium-magnesium fluorination catalysts with trichloroethylene as main materials and dynamics models are set up.

研究了以三氯乙烯为主要原料，在铬镁氟化催化剂存在下，用氟化氢气相氟化制备1，1，1，2-四氟乙烷的反应机理，建立了动力学模型。

On the NiO/SiO〓 catalyst prepared by IM, the main hydrogenation product of MA was SA, the activity and selectivity were almost no relation with the nickel content and nickel species 3. Summarizing the characterization and activity evaluation of the catalysts, we concluded: On nickel based catalyst, when NiO was crystallite, and the Ni〓 that was prepared by reducing, hydrogenation of the MA could lead to SA but not to γ-BL; when NiO was cluster and had a properly interaction with the support, the Ni〓 prepared by reducing, could hydrogenate MA to SA then to γ-BL. When NiO cluster and crystallite were both existed on the catalyst, the hydrogenation products were mixture of SA and γ-BL, and the amounts of SA and γ-BL were related with the ratio of cluster and crystallite.

综合催化剂的表征和活性评价得出：当镍基催化剂上氧化镍以结晶态存在，经氢还原后的零价镍可使顺丁烯二酸酐加氢得到丁二酸酐，丁二酸酐难以进一步加氢为γ-丁内酯；当镍基催化剂上氧化镍以簇团形式存在，与载体之间有适当的相互作用时，经氢还原后的零价镍可使顺丁烯二酸酐加氢得到的丁二酸酐进一步加氢为γ-丁内酯；若催化剂上氧化镍既有结晶态又有簇团形式时，随二者含量比例不同而得到丁二酸酐和γ-丁内酯的混合物。

The influence of addition of Re species and the preparation methods of the ZrO2 support on the catalytic performance of Ru/ZrO2 and Ru-Re/ZrO2 catalysts for glycerol hydrogenolysis were investigated.

考察了Re组分及ZrO2载体制备方法对催化剂在丙三醇氢解制丙二醇反应中的催化性能的影响。

The transition metal carbides were a new class of catalysts which had good catalytic activity and selectivity and were widely used in hydrogenolysis,dehydrogenation,desulfidation,denitrification,reforming,and other hydrocarbon conversion reactions.

过渡金属碳化物作为一种催化新材料得到了人们广泛的关注，在催化加氢、脱氢、脱硫、脱氮和重整等方面，表现出优良的催化活性和选择性。

Under syngas or pure H2, methyl formate hydrogenolysis was carried out over ultrafine CuO－BaO／SiO2 catalysts with various copper content,which had been previously investigated by TEM,BET and TPR techniques.

研究了在合成气或纯氢气气氛下CuO－BaO／SiO2催化剂甲酸甲酯氢解反应活性的变化，并对催化剂进行了TPR、TEM和BET表征。

Multi-hydrogen-groups on the catalyst make deep hydrogenation or hydrogenolysis take place. Adding promoters in the copper-substrate and zinc-substrate catalysts helps to formatting the multi-hydrogen-groups on the surface of them.

通过助催化剂的添加，在Cu基催化剂和Zn基催化剂上产生多氢吸附集团，可以改善催化剂深度加氢或氢解反应的性能，以有效地调控深度加氢反应。

Hydroperoxide decomposition into radicals is accelerated by various catalysts, notable the transition metals.

氢通过氧化物分解为自由基的过程，可被各种催化剂加速，特别是过渡金属。

Ideal catalysts are selected. Main factors influencing the selectivity of cis-pinane and the content of pinane hydroperoxide are investigated. Optimum conditions are decided.

选择了较理想的催化剂，考察了催化反应的某些因素对氢化反应中顺式蒎烷选择性、氧化反应中蒎烷氢过氧化物含量的影响，确定了适宜的工艺条件。

The role of gold is to activate molecular oxygen and promote the decomposition of cyclohexyl hydroperoxide to target products, accounting for the high activity and selectivity of gold catalysts in cyclohexane oxidation.

金在环己烷氧化过程中的作用主要表现为活化分子氧，同时促进中间产物环己基过氧化氢分解为目标产物，从而表现出较高的活性和选择性。

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