查询词典 catalyst

The synthesis of dimethyl fumarate was studied from maleic anhydride and methanol with phospho molybdic acid as the catalyst and bromate as the isomerization catalyst by one-step in this short paper.

采用固体杂多酸磷钼酸为催化剂，溴酸盐为异构化剂，经顺酐一步合成了富马酸二甲酯，探讨了醇酐比、反应时间、催化剂的量、异构化剂的量以及异构化时间对合成DMF收率的影响，并确立了最佳反应条件。

The method comprises the steps that the molybdenum bearing spent catalyst is roasted and comminuted, then the molybdenum bearing spent catalyst is leach and filter by adopting alkaline solution bearing ammonia, ammonium bicarbonate and oxyful, and the secondary roasting and leaching are performed to the solids after filtration, the twice leaching solution is acidified and the aluminum is precipitated out, then is acidified continuously to precipitate out the molybdenum in the form of molybdic acid, the molybdic acid is dissolved by using ammonia water further, the pH value is adjusted again to obtain ammonium molybdate deposition, and the ammonium molybdate product is obtained after dryness.

将含钼废催化剂进行焙烧、粉碎，然后采用含氨、碳酸氢铵和双氧水的碱性溶液浸取并过滤，过滤后的固体物进行二次焙烧和浸取，两次浸取液酸化沉淀出铝，然后继续酸化将钼以钼酸形式沉淀出来，钼酸进一步用氨水溶解，再次调节pH值获得钼酸铵沉淀，干燥后得到钼酸铵产品。

Long-chain branched polyethylene was obtained using a homogeneous bianary catalyst system composed of late and early transition metal complexes,namely a mixture of bis(α-naphthalidine)-2,3-butanediimine NiBr2 and Cp* TiCl3,as catalyst precursors in the presence of MAO.

合成了一种后过渡金属镍化合物 [二- N ，N′--2 ，3-丁二亚胺镍二溴化物 ][C10H7—NC(CH3)C(CH3)N—C10H7]NiBr2，此化合物在MAO活化下催化乙烯聚合能得到含有末端双键的低分子量聚乙烯，即长链α-烯烃。

HC-402-2 Homogeneous catalyst for benzene hydrogenation is improved through removing water from the catalyst and reducing the content of emulsified material in nickelous isooctanoic acid cyclohexane liquor.

HC - 40 2 - 2型苯加氢均相催化剂经过改进，去除催化剂中的水份，降低异辛酸镍环己烷溶液中乳化物含量后，在保持加氢效果不变的前提下，大幅度提高了催化剂的抗水性能、延长了催化剂的使用寿命。

The optimized conditions were as follows.Mass ratio of p nitrotoluene to conc.H\-2SO\-4 to water to catalyst was 1∶7 6∶51 4∶0 268,time for adding catalyst was 45 min,reaction temperature was 83 4 ℃ and reaction time was 50 min.

优化出的工艺条件是：各种物料的质量比m∶m∶m∶m =1∶7 6∶5 1 4∶0 2 6 8，催化剂加入时间为 45min ，反应温度为 83 4℃，反应时间为 5 0min。

The reaction of disproportionation of gum rosin catalyzed by AH nonnoble metal catalyst was studied, and the effects of reaction temperature, reaction time, particle size of catalyst, and stir speed were investigated.

用AH型非贵金属催化剂催化松香歧化反应，考察了搅拌速率，催化剂粒度，反应温度，反应时间对反应的影响，建立了动力学方程。

A process for preparing clean gasoline features that under existance of epoxidizing catalyst and alkoxylating catalyst, the olefine in gasoline and the oxygen and alcohol take part in epoxidizing and alkoxylating reactions to generate diolmonoether or dioldiether compounds which has higher octane number, so being excellent gasoline component.

本发明公开了一种清洁汽油的生产方法，在一个具有环氧化的催化剂以及同时具有烷氧化催化组分或者催化剂的存在下，汽油中的烯烃与氧、醇、发生环氧化、烷氧基化反应而生成二醇单醚或二醇双醚类化合物，这类化合物具有较高的辛烷值，是优良的汽油组分。

Study result suggest: The change of stock in RFCCU directly affect gasoline content. Gasoline content can be reduced through increasing the equilibrium activity of catalyst, controlling reaction level, increasing recirculating rate of gasoline and stability of gasoline level. Conclusions drawn from experiment is that optimization of operating condition has great effect on lowering olefine content of gasoline which can be reduced from 60% to 50%.Reducing reaction temperature is useful for lowering olefine content of gasoline, when the reaction temperature is raised, thermal cracking rate is higher than catalytic cracking rate, so that olefine content is increased. Raising catalyst-to-oil ratio is good for lowering olefine content. With conversion rate increased, the yield of LPG and coke is raised, the yield of gasoline is increased firstly and then decreased slightly, hydrogen transfer index is increased, so the olefine content is decreased.

研究结果表明：催化裂化装置的原料的变化直接影响到催化汽油的烯烃含量；可以通过优化催化装置的操作条件来降低催化汽油中的烯烃含量，其中通过提高催化剂平衡活性、控制反应深度、增加汽油回炼量、汽油深度稳定可以降低催化汽油烯烃含量，优化工艺条件对降低催化汽油烯烃含量有较大作用，汽油烯烃含量由60％降至50％左右；降低反应温度有利于降低催化汽油的烯烃含量，当反应温度的提高，热裂化反应速度提高的幅度大于催化裂化反应速度提高的幅度，汽油烯烃含量增加；剂油比的提高有利于降低催化汽油的烯烃含量，转化率提高，液化气产率提高，汽油收率先增加后略有下降，焦炭产率增加，氢转移反应指数提高，汽油烯烃含量下降；反应时间对产品分布及汽油烯烃含量有影响，增加提升管反应时间，液化汽、汽油产率提高，干气和焦炭产率增加。

A modified γ-Al〓O〓 was prepared by a special precipitation method with aluminum nitrate solution containing a certain amounts of orthosilicic acid and ammonia aqueous solution. Compared with commercial γ-Al〓O〓, the modified γ-Al〓O〓 was an effecient catalyst for dehydration of tetrahydrofurfuryl alcohol to dihydropyran. The results revealed that the strong acid sites on the surface of the catalyst may play a crucial role in this reaction.

并以硝酸铝和氨水为原料，用沉淀法制备出一种高比表面和拥有较多强酸中心的γ-Al〓O〓，它在四氢糠醇开环脱水制备二氢吡喃的反应中有优良的催化活性，通过比较此γ-Al〓O〓和普通商业γ-Al〓O〓的Py-TPD图，发现强酸中心在制备二氢吡喃的反应中可能具有关键的作用。

According to the evaluate and the sift through light paraffine isomerization catalyst,It showsthat preparated Pt-SO_4~(2-)/ZrO_2-Al_2O_3 catalyst achieved superior activity under the condition thatthe calcination temperature is 650°C、 concengtration of SO_4~(2-) is 0.5mol/L、 the content ofAl_2O_3 is 30% and content of Pt is 5%.

通过对轻质烷烃异构化催化剂的评价与筛选，表明所制备的 Pt-SO_4~(2-)/ZrO_2-Al_2O_3 催化剂在焙烧温度为 650°C 、SO_4~(2-)浓度为 0.5mol/L、第二金属氧化物组分 Al_2O_3含量为 30%，金属 Pt 含量为 0.3%时，该催化剂用于异构化反应效果最佳。

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。

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