查询词典 negative catalyst

Kinetics of methanol dehydration to dimethyl ether on modified kaolin catalyst was studied in an integral reactor under normal pressure. It is deduced that the surface reaction of methanol molecule adsorbed on the active site of catalyst with methanol molecule in gas phase is the rate determining step. The hyperbolic type kinetic equation r=ksbMpM2/(1+bMpM+bpE) is obtained according to the theory of langmuir even adsorption and using the R-E mechanism.

采用积分反应器，考察了常压下在改性高岭土催化剂上甲醇脱水生成二甲醚的反应动力学，根据Langmuir均匀吸附理论，采用R-E机理，推断吸附的甲醇分子与气相主体中的甲醇分子发生的表面反应为速率控制步骤，得到双曲线型动力学方程为： r= ksbMpM2 /(1+bMpM+bpE)（r为反应速率， ks为反应速率常数， bM为甲醇的吸附平衡常数， b为二甲醚和水的吸附平衡常数之和， pM、 pE分别为甲醇、二甲醚的分压）。

Catalyst activity was determined by not only specific surface area of catalyst but also the distributions of active center and utilization ratio of internal surface.

实验结果表明：催化剂活性比为不同催化剂单位质量表面上活性中心的总数目N总值的比值；催化剂活性不仅与比表面有关，还与其活性中心分布情况、内表面利用率有关。

On the same catalyst, the adsorption velocity and quantity between the isobutane and butene has great differences, which results in the very low isobutane/butene adsorption ratio in the micro-pore of the catalyst, especially at higher temperature.

利用原位红外对异丁烷和丁烯的吸附和反应历程研究结果表明，异丁烷和丁烯在催化剂不同活性位上的吸附反应过程差别很大。

The catalyst on calcination temperature of 400℃ had the highest conversion of isobutylene and the catalyst on calcination temperature of 500℃ had the highest selectivity of methacrolein .

焙烧温度为400℃的催化剂异丁烯的转化率最高，焙烧温度为500℃的催化剂甲基丙烯醛的选择性最高。

The effects of nature of catalyst, temperature, amount of catalyst, and time on isomerization rate and product compositon were also studied.

同时研究了异构化反应中不同催化剂、反应温度、催化剂用量和时间对异构化速率及产品组成的影响。

The catalysts were prepared by impregnation and precipitation method, and the active carbon,γ-Al2O3, silica and kieselguhr were selected as the carriers of catalyst. the effects of reaction conditions, such as reaction temperature, types of solvents, and types of hydrogen donors were investigated, It was found that the Pd/C catalyst was the best one, and its proper reaction conditions were also obtained as follow: sodium formate as hydrogen donor, water as solvent, reaction temperature of 70℃ and reaction time of 2.5h.

以活性炭、γ-Al2O3、硅胶和硅藻土等为载体，分别采用浸渍法和沉淀法制备了催化剂，对于反应温度、溶剂及氢供体的种类等反应条件的影响进行了研究，发现以沉淀法制备的Pd/C催化剂是对转移加氢最有效的催化剂，初步确定了适宜的反应条件为以甲酸钠作氢供体、水作溶剂及70℃反应2.5h等。

The orthogonal design method is adopted, by changing catalyst category, catalyst quantity, reaction time, reaction temperature, to select the optimum conditions for lactide synthesis.

实验采用正交设计方法，通过改变催化剂种类、催化剂用量、脱水时间、环化时间四个主要影响因素进行实验，根据实验结果选择最好的丙交酯制备的实验方案。

In this research we investigate the effects of steam reforming catalyst (RKNR+RKS-1, Haldor Topsoe) and potassium carbonate catalyst on the gasification of lauan sawdust in a fluidized bed reactor.

本研究旨在探讨蒸气重组触媒(RKNR+RKS-1， Haldor Topsoe)及碳酸钾触媒对木屑在流体化床中气化反应的影响。

It was found that the catalysts with 1.5% Pd content showed a higher activity. At 60—65℃ and 0.6MPa with a total catalyst amount of 0.5%,the conversion of dehydrolinalool was higher than 99% and the selectivity for linalool was higher than 96%. The change in catalyst composition upon reused for 7 times was evaluated by using ICP,and the effect of Pb and Bi to the catalytic behavior was discussed.

结果表明，钯质量分数为1.5%的催化剂活性较高，在反应温度为60～65 ℃，系统压力为0.6 MPa，催化剂用量为原料质量的0.5％，去氢芳樟醇转化率大于99%时，芳樟醇选择性大于96%，催化剂套用7次后，利用ICP对使用前后催化剂的组成进行分析后，根据反应结果分析了Pb和Bi对加氢反应的作用。

The operating range suitable for three-phase reaction was obtained and a mathematical model established. The results show that MSB formed by fine magnetizable powder and fliudizing flow can be operated stably in a wide range. MSB has three kinds of regimes: particulate, chain, and magnetically condensed. In these regimes, the chain regime is the best for three-phase reaction. When Ni-RE-P catalyst particles mixed with some iron powder, magnetically stabilization is easily achieved; therefore, it is possible that NiRE-P catalyst can be controlled in the bed for reaction more easilly if adding certain percentage of iron powder.

研究结果表明：细粉铁磁性颗粒形成的磁稳定床可在较宽流速范围内稳定操作，该磁稳定床有三种操作状态：散粒状态，链式状态和磁聚状态，其中有利于进行气液固三相反应的操作状态是链式状态；当磁稳定床在最小流化速度和带出速度之间操作时，床层处于链式状态；最小流化速度和带出速度可用（1-24）、（1-25）、（1-27）、（1-33）式计算；弱软磁性Ni-RE-P非晶催化剂中混入定量铁粉颗粒后便可形成磁稳定床，因此利用混入铁粉颗粒在外加磁场作用下控制弱磁性非晶催化剂颗粒进行反应的方法是可能的。

When I started coding, I had problems with the ASF file writer.

当我开始编码，我曾与ASF文件作家的问题。

I know that in one of the schools the boys have risen up in the classroom and enlisted in a mass.

如果你们也和他们一样，是集体自愿的话，你们的老师将是多么地光荣啊。