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1.
Quinoxaline derivatives have been synthesized in a very short time with excellent yields by the condensation of 1,2-diamines with aliphatic or aromatic 1,2-dicarbonyl compounds or benzilmonoxime in the presence of silica sulfuric acid as a very inexpensive solid acid catalyst at room temperature. The recovery and reuse of the catalyst are also satisfactory. 相似文献
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固载杂多酸盐催化剂的制备与性能研究 总被引:5,自引:1,他引:4
介绍了固载型杂多酸盐催化剂TiSiW12 O4 0 /TiO2 的两种制备方法 ,并以乙酸正丁酯的合成 ,考察了制备条件对其催化活性的影响 ,结果令人满意 相似文献
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Abdullah Yusulf 《中国化学快报》2010,21(8):922-926
<正>Sulfuric acid immobilized on silica gel is designed as a very useful catalyst for synthesis of 2,3-unsaturated glycopyranosides. This handy,metal-free,environment friendly transformation provides high yields andα-stereoselectivities in a very few amount (0.02 eq.) of catalyst and in short reaction times(10 min). 相似文献
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TANG Ya-wen ZHANG Lin-lin WANG Xin BAO Jian-chun ZHOU Yi-ming LU Lu-de LU Tian-hong . Materials Chemistry Laboratory Nanjing University of Science Technology Nanjing P. R. China . College of Chemistry Environmental Science Nanjing Normal University Nanjing . Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 《高等学校化学研究》2009,25(2)
A carbon supported Pd(Pd/C) catalyst used as the anodic catalyst in the direct formic acid fuel cells(DFAFC) was prepared via the improved complex reduction method with sodium ethylenediamine tetracetate(EDTA) as stabilizer and complexing agent.This method is very simple.The average size of the Pd particles in the Pd/C catalyst prepared with the improved complex reduction method is as small as about 2.1 nm and the Pd particles in the Pd/C catalyst possess an excellent uniformity.The Pd/C catalyst shows a high electrocatalytic activity and stability for the formic acid oxidation. 相似文献
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Melamine sulfonic acid as a novel and efficient solid acid catalyst has been synthesized and used in the ring opening of epoxides under solvent-free conditions. This catalyst afforded the corresponding thiocyanohydrins with good regioselectivity and very short reaction times. The catalyst can be easily separated and reused several times without appreciable loss of activity. The availability and recoverability of the catalyst with easy operation and workup make this method attractive for organic synthesis. 相似文献
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OXIDATIVE COUPLING OF METHANE IN A CIRCULAR FIXED BED REACTOR WITH 30 mL MgO/BaCO_3 CATALYST
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在甲烷氧化偶联反应中,采用了一种薄层环形固定床反应器,这种反应器有利于反应热的转移。在环形固定床反应器中进行的MgO/BaCO3催化剂稳定性试验结果表明,催化剂在500h试验中一直保持较高的活性。在CH4:O2:H2O=5:1:2.3,CH4的GHSV为5700h-1的条件下,得到甲烷转化率为26%,C2烃收率为17.3%,C2选择性为67.5%;水蒸汽作为稀释气引入反应中,可分散和带走催化剂床层过多的反应热,减小床层温差。XRD结果表明,反应后的催化剂与新鲜催化剂的结构基本一致,催化剂具有稳定催化活性的原因,应归属于其结构的稳定性和具有一定的抗水蒸汽性能。 相似文献
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The novel efficient procedure has been developed for the oxathioacetalization of carbonyl compounds and 2-mercaptoethanol
using the novel carbon-based sulfonic acid as catalyst under solvent-free condition at room temperature. The results showed
that the novel catalyst was very efficient for the reactions with good to excellent yields in short time. The novel catalyst
owned many advantages such as operational simplicity, without need of any solvent, small amount of usage, low cost of the
catalyst used, high yields, applicability to large-scale reactions, reusability and chemoselectivity over the traditional
catalysts, which made the catalyst one of the best choices for the reactions. 相似文献
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A dabco-based basic ionic liquid,1-butyl-4-aza-1-azaniabicyclo[2.2.2]octane hydroxide,has been developed as a catalyst for a convenient and rapid method for the Michael addition of active methylene compounds to a b-unsaturated carboxylic esters and nitriles.The method is very simple,and the yields are very high.The catalyst can be recycled several times without much loss of activity. 相似文献
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新型WO3/HMS催化剂的制备及其对环戊烯选择氧化反应的催化性能 总被引:3,自引:0,他引:3
采用草酸络合方法将WO3固载到六方介孔全硅分子筛HMS上,制得新型WO3/HMS非均相催化剂. 利用SEM,TEM,N2吸附,XRD及激光拉曼光谱等手段对催化剂进行了表征,研究了催化剂在环戊烯选择性氧化合成戊二醛反应中的催化性能. 结果表明,在WO3/HMS催化下环戊烯和H2O2的转化率均可达100%,戊二醛的选择性可达72%. WO3以高分散状态存在于催化剂表面. 单次反应后钨的溶脱量(5.5 μg/ml)很小,对反应几乎没有影响. 催化剂具有较高的稳定性,可以重复套用6次. 失活后的催化剂可通过简单焙烧的方式再生. 相似文献
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烯烃聚合高性能FI催化剂的进展 总被引:1,自引:0,他引:1
金鹰泰 李刚 曹丽辉 蔡洪光 巴晓微 原宇平 张学全 董为民 WOO Seong-ihi CHO Hyun-yong CUI Li-qiang HONG Dae-sik JEONG Dong-wook 《高分子通报》2006,(9):37-50
FI催化剂系一近几年发展起来的烯烃聚合高性能催化剂。以它的极高的活性、聚合物分子结构的可控性、多重活性聚合等特性而引人注目。本评述首先进行该催化剂的化学描述,然后分别介绍该催化剂的主要特征、活性中心结构、聚合机理和应用,重点介绍该催化剂的五大特征。 相似文献
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Erioglaucine A, Eriogreen B, Patent Blue and Xylene Cyanol FF work satisfactorily for the titration of Sb(III) with Ce(IV) in 1-2N sulphuric acid medium with iodine as catalyst. In hydrochloric acid medium the colour of the oxidized dye is very evanescent but is very much improved in intensity and stability by the addition of manganese(II) sulphate; no catalyst is needed. 相似文献
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Antonio Massa Eleonora M. De Lorenzo Arrigo Scettri 《Journal of molecular catalysis. A, Chemical》2006,250(1-2):27-29
The oxidation of sulfides to sulfoxides has been conveniently performed under heterogeneous and solvent-free conditions employing polymeric Ti(IV) glycolate as reusable catalyst and t-butyl hydroperoxide as oxygen donor. The catalyst can be very efficiently recovered and reused several times without any significant change in reactivity and selectivity. 相似文献
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Srivari Chandrasekhar Togapur Pavan KumarKothapalli Haribabu Chada Raji ReddyChitumalla Ramesh Kumar 《Tetrahedron: Asymmetry》2011,22(6):697-702
An enantioselective Michael reaction of carbonyl compounds to nitroolefins has been accomplished using a novel chiral pyrrolidine-pyrazole catalyst. This newly prepared catalyst was found to be very effective in providing good yields as well as good diastereo- and enantio-selectivities. The mechanism of the reaction has also been substantiated by mass spectral studies. 相似文献
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Ni-Fe/SiO_2催化剂催化油脂加氢作用研究(Ⅰ)──催化剂的制备及其活性廖世军,胡珍珠,易回阳,千载虎,郭灿雄(湖北师范学院化学系,黄石,435002)(吉林大学化学系)关键词加氢,植物油,Ni-Fe/SiO_2催化剂油脂加氢反应具有重要的经济价... 相似文献
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研究了二茂基二价钐配合物(C5H5)2Sm(THF)作为单组分催化剂催化己内脂开环聚合反应,考察了催化剂用量、聚合反应时间、聚合反应温度对己内酯聚合反应的影响。结果表明,配合物(C5H5)2Sm(THF)对己内酯聚合有极高的催化活性且产物的数均分子量较高,当催化剂与单体摩尔比为1:5000时,聚合产率仍可达50.3%,数均分子量可高达32.4万;温度升高,聚合反应的转化率增加,聚合产物数均分子量降低;催化剂用量增加,聚合转化率增加,聚合产物分子量降低;聚合产物的分子量分布较窄;通过凝胶色谱法对聚合产物的分子量及分子量分布进行了表征。 相似文献
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Alexander Goller Dr. Johannes Obenauf Dr. Winfried P. Kretschmer Prof. Dr. Rhett Kempe 《Angewandte Chemie (International ed. in English)》2023,62(8):e202216464
The highly controlled and efficient polymerization of ethylene is a very attractive but challenging target. Herein we report on a Coordinative Chain Transfer Polymerization catalyst, which combines a high degree of control and very high activity in ethylene oligo- or polymerization with extremely high chain transfer agent (triethylaluminum) to catalyst ratios (catalyst economy). Our Zr catalyst is long living and temperature stable. The chain length of the polyethylene products increases over time under constant ethylene feed or until a certain volume of ethylene is completely consumed to reach the expected molecular weight. Very high activities are observed if the catalyst elongates 60 000 or more alkyl chains and the polydispersity of the strictly linear polyethylene materials obtained are very low. The key for the combination of high control and efficiency seems to be a catalyst stabilized by only one strongly bound monoanionic N-ligand. 相似文献
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Yao Q 《Organic letters》2002,4(13):2197-2199
[reaction: see text] The combination of the ionic liquid [bmim]PF(6) and DMAP provides a most simple and practical approach to the immobilization of OsO(4) as catalyst for olefin dihydroxylation. Both the catalyst and the ionic liquid can be repeatedly recycled and reused in the dihydroxylation of a variety of olefins with only a very slight drop in catalyst activity. 相似文献