查询词典 catalyst

Promotion effects of alkaline earth metals and rare earth metals on catalytic activity and coking resistance of the catalyst are also described.

阐述了碱土金属和稀土金属助剂在提高催化剂的重整活性和抗积炭能力方面的作用。

The raw materials used by the method are green chemicals dimethyl carbonate and p-nitrophenol, and the catalyst is NaY molecular sieve, activated aluminum oxide or activated carbon which is impregnated by alkali metals or alkaline-earth metal compounds.

本发明涉及到一种合成对硝基苯甲醚的方法，该方法所用的原料为绿色化学品碳酸二甲酯和对硝基苯酚，催化剂是经碱金属或碱土金属化合物浸渍过的NaY分子筛、活性氧化铝或活性碳。

The solvent capacity of ionic liquid for alkane is important to he separation of the alkylate and the catalyst.

而饱和烷烃在离子液体中的溶解能力对烷基化产物和催化剂的分离十分重要。

The new catalyst for preparing base oil of lubricant by polymerization of α-alkene was studied.

对α-烯烃聚合制备润滑油基础油的新型催化剂进行了研究。

Before regeneration, 160 kg LAB product/kg catalyst can be obtained with over 98% of alkene conversion.

研究还表明，在Y型分子筛中引入Sr~(2+)后能增强分子筛对苯的吸附能力，在反应温度下使苯仍能维持活化吸附状态。

Combining the performance evaluation (activity, selectivity and stability) and the characterization of the catalysts (XRD, TPD, FTIR and the pore structure measure), it can be concluded that :(1)The activity of modified β is higher than MCM-22, but the selectivity of ethylbenzene is lower about 3% than that of MCM-22;(2)The mounts of diethylbenzene and the other by-products are higher 1.7 times and 1.5 times than these of MCM-22 respectively;(3)The catalytic performance of zeolite mixture is nearly equal to modified β, but the selectivity of ethylbenzene is higher about 0.5% than that of modified β;(4)The catalytic activity of zeolite is mainly correlated with the number of acid sites, strength and distribution, and the distribution of products is determined by the binding energy of ethylbenzene and the pore structure, while the stability of catalyst is affected by the amount of poly-ring aromatic alkylate and the pore structure.

以性能评价和特性表征（XRD、TPD、FTIR和孔结构测定）相结合的方式，对上述三种催化剂性能比较的结果表明：（1）改性的活性明显高于MCM-22，但乙苯选择性却低于MCM-22绝对差约3%；（2）改性(上二乙苯和其他副产物的生成量分别约为MCM-22上对应值的1.7和1.5倍左右；（3）混合型催化剂的性能与改性相仿，但乙苯选择性提高0.5%左右；（4）对乙苯合成，沸石催化剂的活性主要取决于其B酸中心数、酸强度及酸分布，产物分布则取决于催化剂表面的乙苯脱附能垒值和孔道结构，而稠环芳烃的生成量和催化剂孔道结构是影响催化剂稳定性的主要因素。

The results showed that the catalyst has highly activity and stability in the alkylation of benzene with dodecytene.

研究结果表明负载HPWA的SBA-15催化剂具有较好的催化活性和稳定性。

The effects of reaction condition and the method of modification onhe alkylation performance of the catalyst were researched.

考察了Hβ沸石及改性后制得催化剂上反应条件及改性方法对反应性能的影响。

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。

Some advantages of this invention are that it provides desirable catalyst lifetime and activity, minimizes resin swelling, and provides a desirable, sustained selectivity to alkylene glycol.

本发明的优点是，它提供了所希望的催化剂寿命和活性，最大程度地减少了树脂溶胀和提供了理想的、持久的对亚烷基二醇的选择性。

There had been a moment during the breakfast meeting, though, after the backslapping and the small talk and when all of us were seated, with Vice President Cheney eating his eggs Benedict impassively and Karl Rove at the far end of the table discreetly checking his BlackBerry, that I witnessed a different side of the man.

那次早餐会期间，在表示过关心和寒暄以后，我们所有人坐了下来，我注意观察了一下，副总统切尼面无表情地吃着班尼迪克蛋（Eggs benedict，源自美国，以英式松饼、火腿、水煮蛋以及荷兰酱组合而成），卡尔。罗夫在餐桌的远端谨慎地经常查看他的黑莓手机，我目睹了他所不为人知的一面。

Talk Undelete failed; someone else may have undeleted the page first.

Talk 无法删除选定的页面或图像（它可能已经被其他人删除了）。