查询词典 catalysts

These materials were effective catalysts in the hydroxylation of benzene with H2O2 under room temperature.

所合成材料室温下在苯的过氧化氢直接羟基化反应中表现出良好的催化性能。

XRD, FT-IR, DTA, BET and other methods were used for characterization of phenol hydroxylation catalysts.

采用XRD、FT-IR、DTA、BET等手段对苯酚羟基化催化剂的物理化学性能进行了表征。

A series of Ni-based catalysts with different supports were prepared by impregnation method and tested in the hydroxylation of benzene to phenol.

本文利用浸渍法制备了一系列不同载体的镍基催化剂，并将其用于苯的羟基化反应。

In this dissertation, we studied the catalysts, reaction conditions and mechanism of one-step hydroxylation of benzene to phenol oxidized by molecular oxygen, which is the cleanest and the most economical process.

所以近年来作为一条比较经济的路线，以苯为原料经过一步氧化，直接羟基化生产苯酚的反应吸引了各国研究者的广泛关注，这也是催化化学中最为艰难、最具有挑战性的研究课题之一。

Ni compounds are excellent catalysts for the reduction of nitroaromatics and SiO_2 is a commonly-utilized catalyst for imine formation.

镍类催化剂是硝基还原的优秀催化剂，SiO_2是亚胺合成的常用促进剂，因而Ni/SiO_2很有可能是从芳香族硝基化合物和醛一锅合成亚胺的优良多功能催化剂。

The traditional approach to produce Ni catalysts are mainly, immergence, ion-exchanged, and sol-gel method.

这类催化剂制备的传统方法主要有浸渍法、离子交换法、沉积沉淀法等。

Now, the traditional preparation methods of complex nano-catalysts are chemistry method and physics method, such as immergence, ion-exchanged, adsorption, evaporation and sol-gel method.

目前，传统的制备复合型纳米催化剂分为物理、化学制备方法，概括起来有：浸入法、离子交换法、吸附法、蒸发法、醇盐法和溶胶凝胶法。

Comparison of the thermogra- vimetric curves of these three catalysts showed that the ignition temperature, the peak temperature and the burn-off temperature of carbon black's catalytic oxidation over each catalyst can be listed in increasing sequence as: KVO3

比较3种催化剂的热重曲线发现，在相同的升温速率下，碳黑催化氧化的起燃温度、峰值温度和燃尽温度由低到高排列顺序均为：KVO3

The results show that the total acid amount changed indistinctively and strong acid sites increased relatively if the treated temperature was not higher than 400 ℃ even in two different treated media. However, the total acid amount decreased obviously and strong acid sites nearly disappeared as the treated temperature was beyond 500 ℃, and the second pore with different pore sizes formed and average pore diameter enlarged of MCM-22 zeolite catalysts after hydrothermal treatment.

研究结果表明，在两种不同介质中和处理温度不高于400 ℃条件下，催化剂的总酸量变化不大，强酸中心有所增加；处理温度高于500 ℃后，催化剂的总酸量明显下降，强酸中心基本消失；经水热处理后， MCM-22分子筛催化剂中形成了孔径不均匀的二次孔，平均孔径增大。

Lack of information on the description of its route of synthesis, absence or insufficience of its impurity profile (related substances, reagents, solvents, catalysts), and the carry-over of its impurities to the final substance (58.5% of dossiers).

缺少如下资料：起始原料合成路线的叙述，起始原料的杂质概况（有关物质，试剂，溶剂，催化剂）没有或不充分，起始物料中杂质携带至原料药中的情况（申请文件的58.5%）。

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