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报道了 732树脂固载三氯化铁催化合成苯酚 ,研究了反应温度、双氧水浓度、反应物投料比、反应时间和催化剂用量对反应的影响及催化剂的重复使用性能。 相似文献
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以苯酚、三氯氧磷为原料,以无水三氯化铝为催化剂合成了氯化磷酸二苯酯;采用正交试验研究了反应温度、反应时间、催化剂用量和原料配比对反应收率的影响,确定了最佳工艺条件;并利用红外光谱和核磁共振谱表征了产物的结构.结果表明,影响反应收率的几种因素的排序为:反应温度>原料配比>催化剂用量>反应时间;最佳反应条件为:温度70℃、反应时间15h、原料配比(n苯酚∶n三氯氧磷)2∶1、催化剂用量0.8g(相对于苯酚的质量分数为4.25%).与此同时,采用加水后处理方法可以提高产品收率和可操作性. 相似文献
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以大孔强酸性阳离子交换树脂(CT175)为催化剂,催化甲缩醛和三聚甲醛反应得到聚甲醛二甲醚(PODEn)。考察了催化剂种类、温度、时间、压力、催化剂用量、原料配比对反应的影响,并研究了催化剂的重复使用性能。结果表明,反应最佳条件为:m甲缩醛:m三聚甲醛=2.5:1,催化剂用量7.5wt%,温度90℃,时间0.5h,压力1.5MPa。在最优条件下,三聚甲醛的转化率达89.0%,PODE3-8的选择性为64.2%。催化剂重复使用20次后,催化活性无明显变化。 相似文献
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Reduction of barium sulfate by methane was investigated in this work. The thermogravimetric method was used to obtain kinetic parameters of the reaction in the temperature range of 900–975 °C at atmospheric pressure. The kinetics of the reaction has been studied both in the absence and presence of zinc oxide as a catalyst. The conversion–time data have been interpreted by using the grain model, and the effect of catalyst on the kinetic parameters has been elucidated. It was found that zinc oxide acted as fairly strong catalyst for the reaction, especially at higher temperatures. At about 975 °C the reaction rate constant was increased more than 7 times by using 2% of zinc oxide. This enhancement in the rate constant is valuable for industries. 相似文献
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低压合成甲醇催化剂母料变色点性质的研究 总被引:5,自引:2,他引:5
研究了合成甲醇催化剂母料陈化期间pH值的变化情况,尤其是母料变色点前后pH值的变化,考察了反应pH值及反应温度对变色时间及催化剂活性的影响。结果表明,合成甲醇催化剂母料在陈化期间pH值一直在改变,在变色点附近出现了pH值的一个极小值,与其相应的是在母料变色前后催化剂的活性发生了明显的变化,因此,在变色点前后母料的组成及结构都发生了明显的变化。升高反应温度有利于母料结构的调变,升高反应pH值不利于母料结构的这种变化。通过本实验确定了催化剂母料在并流情况下最佳沉淀pH值范围为7.5~8.5,最佳沉淀温度大于80 ℃。 相似文献
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SO_4~(2-)/ZrO_2超强酸催化合成邻苯二甲酸二辛酯初探 总被引:2,自引:0,他引:2
初步探索了SO42-/ZrO2超强酸作为合成邻苯二甲酸二辛酯(DOP)催化剂的催化性能.详细考察了反应温度、催化剂用量和反应时间对邻苯二甲酸酐转化率的影响.结果表明,反应温度低于428K时,温度的升高显著增加邻苯二甲酸酐的转化率,反应温度高于428K时,温度的升高对转化率的影响较小;催化剂用量为邻苯二甲酸酐的3%时,邻苯二甲酸酐的转化率即可达到93.6%,表明SO42-/ZrO2超强酸催化剂具有很高的催化活性;催化剂使用20小时后,转化率由958%下降到86.5%,表明初步制得的催化剂稳定性还较差;用SO42-/ZrO2超强酸催化剂会成的DOP为无色透明油状液体。其品质明显优于用对甲苯磺酸或液体改作催化剂时的产品。 相似文献
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YBO3:Eu荧光粉的水热法制备及形貌控制 总被引:5,自引:0,他引:5
用水热法在低于300℃成功地制备出具有不同形貌的YBO3:Eu3+荧光粉,其反应温度比固相反应了约800℃.研究了初始原料、pH值、反应温度、反应溶剂和催化剂等条件对目的产物形貌及粒度的,得到了具有Vaterite结构、粒度分布均匀的球形荧光粉的最佳合成工艺.在254nm激发下,水热法的球形Y0.95Eu0.05BO3荧光粉最强发射峰位于598nm处,属于Eu3+的5D0→7F1的跃迁,是固相反应所品的1.5倍.这些结果表明,在PDP和荧光灯等显示和照明用荧光粉的制备中水热法具有潜在的应用. 相似文献
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St. Christoskova M. Stoyanova M. Georgieva 《Reaction Kinetics and Catalysis Letters》2000,70(1):139-145
Catalytic oxidation of sulfide ions in aqueous solutions by air oxygen has been investigated using a Ni-oxide system as a catalyst. The kinetics and the selectivity of the oxidation process were studied by varying the pH, catalyst amount and reaction temperature. A reduction/oxidation mechanism of the reaction has been supposed comprising interaction between the surface active oxygen of the catalyst and HS– and reoxidizing of the reduced catalyst by the dissolved oxygen. The results obtained show that the Ni-oxide system is a promising catalyst for practical application. 相似文献
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研究了铌掺杂的Li/MgO甲烷氧化偶联催化剂的反应性质及铌的助剂作用。铌的引入使得该催化剂上甲烷氧化偶联反应的活化温度降低50℃以上, 使此温度降到了催化剂中碳酸锂的熔点附近。试验观察到部分催化剂上甲烷氧化偶联反应的活性曲线在碳酸锂的熔点附近有一转折, 这一转折现象的出现与否及程度取决于制备条件。在碳酸锂的熔点附近, 含有铌的催化剂得到活化, 观察到无稀释气体时的反应引燃现象, 即温度增加几度活性便达到最大值。当在比碳酸锂熔点稍高的温度下且不稀释时反应, 含铌催化剂活性很高但很快失活, 在稍低于此熔点下则不失活, 但活性较低。这些试验结果表明, 含铌催化剂的活化与失活均与催化剂中的碳酸锂的相变化有关。试验还观察到了在稍高于碳酸锂的熔点下做寿命试验时, 甲烷氧化偶联反应的振荡现象。 相似文献
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The catalytic activity of a polymer-bound palladium Schiff base catalyst was investigated toward the reduction of aryl nitro
compounds under ambient temperature and pressure. The dependence of the rate of hydrogenation of o-nitroaniline and o-nitrotoluene on substrate concentration, catalyst concentration and temperature has been determined. Based on the results
obtained a plausible mechanism for the hydrogenation reaction is proposed and a rate expression is deduced. The energy and
entropy of activation have been evaluated from the kinetic data. The polymer-bound catalyst was found to be better than its
homogeneous analog PdCl2(NSBA) [NSBA = N-salicylidene benzylamine] for both stability and reusability. Recycling studies revealed that the catalyst could be used
six times without metal leaching or significant loss in activity. 相似文献
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STUDY OF Cu-Mu CATALYST FOR THE SYNTHESIS OF METHYL FORMATE AND METHANOL FROM SYNTHESIS GAS 下载免费PDF全文
将一种新型的CuMn催化剂用于由合成气合成甲酸甲酯和甲醇,该催化剂表现出良好的反应活性和甲酸甲酯选择性。考察了反应温度、合成气压力及催化剂制备方法等对合成甲酸甲酯和甲醇的反应活性及选择性的影响。在反应条件下,产物收率最高达60.10g/(L·h),产物甲酸甲酯的选择性很高。用BET、XRD及XPSAuger等测试方法对催化剂的比表面、晶相组成以及铜、锰在催化剂中的价态进行了表征,并探讨了催化剂失活的原因。 相似文献
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Yu. M. Mikhailov L. M. Kustov V. V. Aleshin A. L. Tarasov L. V. Zhemchugova 《Kinetics and Catalysis》2011,52(2):277-281
The hydrogenation of 1,3-pentadiene into pentenes over the commercial 0.5% Pd/Al2O3 catalyst and over a new catalyst containing 1.0% Pd and 3.7% Ag (μ-catalyst) has been investigated. The new catalyst has
been prepared via the flameless wave conversion of cyclotrimethylenetrinitramine in a porous composite. The catalytic properties
of the new composite in the hydrogenation reaction depend on the hydrogen/1,3-pentadiene ratio and on the catalyst activation
temperature. The reaction conditions for selective 1,3-pentadiene hydrogenation have been optimized. The pentenes yield as
a function of temperature passes through a maximum at any H2/C5H8 ratio between 1 and 2. The 2-pentene/1-pentene ratio in the reaction products increases as the temperature is raised. 相似文献