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- 与 catalytic 相关的网络例句 [注:此内容来源于网络,仅供参考]
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In this work , 1,8-octodiol, the starting material, reacted with 40% hydrobromic acid to produce 8-bromooctan-1-ol, with the catalytic action of PPTs, its hydroxyl group was protected by 2,3-dihydropyran. Then it coupled with 1-heptaalkyne, by means of P-2 nickel as catalyst, stereoselectivity catalysis hydrogenated, with the catalytic action of acid to take off extremital 2, 3-dihydropyran which protected hydroxy group, then used PCC to oxidize alcohol into corresponding aldehyde.
以1,8-辛二醇为原料,与40%氢溴酸进行单溴代反应,得到8-溴-1-辛醇,在对甲苯磺酸吡啶盐的催化下与2,3-二氢吡喃反应,保护分子中的羟基,再与1-庚炔进行偶联,以P-2镍为催化剂立体选择性催化加氢,酸性条件下脱末端的2,3-二氢吡喃对羟基的保护,使用氯铬酸吡啶盐将醇氧化成醛。
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The catalytic performance of all the amorphous alloy catalysts mentioned above was measured during liquid phase hydrogenation of furfural to furfuryl alcohol, together with the kinetic studies. The relationship between the catalyst performance and the structure of catalyst, surface electronic state of the amorphous alloy has been systematically studied based on a series of characterization of catalysts . Meanwhile, the promoting effects of the support on the thermal stability and catalytic activity of the amorphous alloy catalysts have been discussed.
本文采用一系列的表征方法(XRD、XPS、TEM、BET、氢吸附、TPD等)进一步研究非晶态合金催化剂的表面结构、表面电子态和催化性能之间的关系,探索电子效应和几何效应对催化剂活性中心结构的影响,探索非晶态合金的晶化失活和载体对非晶态结构的稳定化作用,以及修饰剂对催化性能的改善作用等。
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Amorphous alloys represent a variety of special materials with short-range ordering while long-range disordering structure which may provide pathways to the excellent catalytic properties, i.e., good anti-poisoning ability, the higher catalytic activity and selectivity in homogeneous hydrogenation of a,p-unsaturated aldehyde, the low and even none environment pollutionUp to now, in hydrogenation of furfural to furfuryl alcohol, the most commonly used catalysts are Cu-Cr dopant Cu-Cr, and Raney Ni et al.
目前,在糠醛催化加氢反应中所用的催化剂主要有Cu-Cr和修饰的Cu-Cr以及Raney Ni等,Cu-Cr催化剂毒性较高,对环境构成严重的危害,而且易阻塞反应器。
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The good catalytic performances were obtained on those catalysts supported by SiO_2. With the increasing calcination temperature from 300℃to 700℃, Co_3O_4 particles augmented and sintered on the samples surface which contained 10 wt.% cobalt, the crystallite size of Co_3O_4 was aggrandized from 7.2 nm to 20.3 nm by inchmeal. On the other hand, the activation energy for the combustion reaction was increased linearly with the augment of average crystallite size of Co_3O_4, the TOF value on prepared catalyst was decreased with it. Thus, the catalytic combustion was a typical structure-sensitive reaction.
在钴含量为10 wt%的样品上,随着焙烧温度由300℃提高到700℃,钴物种出现迁移团聚甚至烧结,在XRD中测定的Co_3O_4晶粒尺寸由7.2 nm逐步增加至20.3 nm;另一方面,催化剂的燃烧活化能随样品上Co_3O_4晶粒的平均尺寸增加而呈现线形增加趋势,而单位时间内单位活性物种上的甲烷转换频数随着粒径增加而逐渐降低,这一现象证实了该反应属于典型的结构敏感反应。
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Its catalytic performance for Heck arylation of acylic acid with iodobenzene shows that the catalyst has catalytic activity and regioselectivity for the synthesis of trans-phenylacrylic acid.
结果表明该催化剂具有较高的催化活性和立体选择性,可高转化率、高产率地合成反式苯丙烯酸;通过简单的过滤、溶剂洗涤回收催化剂,并能多次重复使用。
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The catalytic transformation pathway can change to decrease the yield of hydrogen and yield methyl-contained sulfides such as methyl mercaptan, dimethyl sulfide and dimethyl disulfide, but overlarge concentration of methanol would holdback the transformation of isobutyl mercaptan. The transformation of isobutyl mercaptan was favorable if the volume ratio of methanol and benzene was 0.2.The addition of methanol assume certain effect on the catalytic cracking of di-n-butyl sulfide in solvent benzene but without changing the cracking reaction mechanism of di-n-butyl sulfide.
甲醇也可以使异丁硫醇的催化转化路径发生改变降低硫化氢的产率,生成甲硫醇、甲硫醚及二甲基二硫化物等含甲基硫化物,但甲醇的浓度过高会抑制异丁硫醇的转化,在反应体系中当甲醇的体积占到溶剂苯体积的20%时对异丁硫醇的转化较为有利;甲醇的添加对丁硫醚在溶剂苯中的催化裂化有一定影响,但没有改变丁硫醚的裂解反应历程。
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A new catalytic spectrophotometry was established for the determination of trace silver based on the catalytic effect of Ag on the oxidational discoloration reaction of methyl violet with potassium persulfate in buffer medium of HAc-NaAc including phenothroline as activator.
在醋酸-醋酸钠缓冲介质中,有活化剂邻二氮菲存在时,Ag对过硫酸钾氧化甲基紫褪色反应有催化作用,建立了测定痕量银的新催化光度法。
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A catalytic kinetic spectrophotometric method has been established for the determination of trace Mn, based on the catalytic action of Mnon the oxidation - reduction reaction between KIO4 and KI in the presence of 1, 10 -phenanthroline and in HAc-NaAc buffer solution.
本文研究了HAc-NaAc缓冲溶液中,在1,10—菲啰啉激活作用下,锰对KIO4-KI氧化还原反应的催化动力学条件,建立了催化动力学光度法测定痕量锰的方法。
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In the catalytic oxidation of hydrocarbons, titania-pillared zirconium phosphonate and phenylphosphonate had a catalytic activity higher than TiO2, they also showed a good stability during the reaction.
在烃类的催化氧化反应中,氧化钛层柱磷酸锆具有优于TiO2的选择氧化性能,并在反应中表现出较好的稳定性。
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New methods for asymmetric synthesis of pinacol are reviewed, the catalytic effects and stereo- selectivity with various catalytic systems are discussed in this paper.
综述了近年来不同催化体系的不对称合成呐醇的方法,并总结了不同的催化效率和对映选择性的差异
- 推荐网络例句
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On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.
另一方面,更重要的是由于城市住房是一种异质性产品。
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Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.
气候直方图是将所收集的降水量测定值,分为几个相等的区间作为横轴,并将各区间内所测定值依所出现的次数累积而成的面积,用柱子排起来的图形,也叫做柱状图。
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You rap, you know we are not so good at rapping, huh?
你唱吧,你也知道我们并不那么擅长说唱,对吧?