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101.
不同环大小分子筛对钼基分子筛催化剂上甲烷无氧芳构化反应的影响 总被引:2,自引:0,他引:2
钼基分子筛催化剂,由于不同分子筛的孔道大小及孔道形状不同\r\n,对甲烷芳构化反应表现出不同的催化性能.具有8元环孔道结构的小\r\n孔ERS-7分子筛没有催化活性,说明甲烷的芳构化反应离不开分子筛孔\r\n道的择形作用,较小的孔道中不能生成苯等芳烃.具有10元环孔道结构\r\n的ZSM-5,ZSM-11和ZRP-1三种分子筛具有较好的催化性能,但由于\r\n其孔道大小及孔道形状的差别在催化行为上表现出一定的差异.具有1\r\n0元环和12元环孔道结构的MCM-22分子筛,尤其对苯等轻芳烃而言,催\r\n化性能最佳.具有12元环孔道结构的JQX-1以及中孔分子筛SBA-15,\r\n虽然具有一定的催化性能,但活性较低.研究结果表明,孔道大小与苯\r\n分子动态直径相近或孔道稍大的分子筛是催化甲烷芳构化反应的良好载\r\n体,孔道过大或过小都不利于苯和萘等芳烃的生成. 相似文献
102.
103.
Yang L Mayr M Wurst K Buchmeiser MR 《Chemistry (Weinheim an der Bergstrasse, Germany)》2004,10(22):5761-5770
The synthesis of novel ruthenium-based metathesis catalysts containing the saturated 1,3-bis(2,4,6-trimethylphenyl)-3,4,5,6-tetrahydropyrimidin-2-ylidene ligand, that is, [RuCl2(NHC)[=CH-2-(2-PrO)-5-NO(2)-C6H3]] (1) and [Ru(CF3COO)2(NHC)[=CH-2-(2-PrO)-5-NO2-C6H3]] (2) (NHC=1,3-bis(2,4,6-trimethylphenyl)-3,4,5,6-tetrahydropyrimidin-2-ylidene) is described. Both catalysts are highly active in ring-closing metathesis (RCM) and ring-opening cross-metathesis (ROCM). Compound 1 shows moderate activity in enyne metathesis. Compound 2 is not applicable to enyne metathesis since it shows high activity in the cyclopolymerization of diethyl dipropargylmalonate (DEDPM). Poly(DEDPM) prepared by the action of 2 consists of 95% five-membered rings, that is, poly(cyclopent-1-enevinylene)s, and 5 % of six-membered rings, that is, poly(cyclohex-1-ene-3-methylidene)s. The polymerization proceeds in a nonliving manner and results in polyenes with broad polydispersities (1.9< or =PDI< or =2.3). Supported analogues of 2 were prepared by immobilization on hydroxymethyl-Merrifield resin and a monolithic support derived from ring-opening-metathesis polymerization (ROMP). Catalyst loadings of 1 and 2.5%, respectively, were obtained. Both supported versions of 2 showed excellent reactivity. With 0.24-2% of the supported catalysts, yields in RCM and ROCM were in the range of 76-100%. Leaching of ruthenium was low and resulted in Ru contaminations of the products of less than 0.000014% (0.14 ppm). 相似文献
104.
Ryashentseva M. A. Egorova E. V. Trusov A. I. Antonyuk S. N. 《Russian Chemical Bulletin》2002,51(9):1698-1701
The activity and selectivity of mono- and bimetallic catalysts containing copper and rhenium on sibunite were studied in the decomposition of methanol to methyl formate (MF), water, H2, CO, and CO2at 200—400 °C. Methane is also formed on rhenium-containing catalysts at 300—400 °C. The dehydrogenating activity and selectivity to form MF are higher on the copper-sibunite catalysts than on the rhenium-sibunite samples. The introduction of 0.25% Re into the 4% copper-containing catalyst enhances its total activity and stability. 相似文献
105.
用于直接合成碳酸二甲酯的新型高活性催化剂 A Novel Highly Active Catalyst for the Direct Synthesis of Dimethyl Carbonate 总被引:2,自引:0,他引:2
将CO2直接合成法和酯交换法相结合,通过超强碱的引入和催化剂的微粉化,制备了一种新型的负载于MgO表面的碱-金属盐路易斯酸双组分催化剂,实现了以CO2,甲醇和环氧丙烷为原料的碳酸二甲酯一步直接合成. 相似文献
106.
107.
Ti2(OMe)4/SiO2催化剂的制备及其合成碳酸二甲酯的反应性能 总被引:4,自引:2,他引:4
采用表面改性和离子交换法制备了SiO2负载的Ti2(OMe)4双核桥联配合物催化剂,用IR、TPD和微反技术考察了催化剂的表面构造及CO2和CH3OH在催化剂表面上的化学吸附和反应性能。结果表明:双核桥联配合物Ti2(OMe)4以Ti-O-Si键锚定在SiO2表面上;CO2在催化剂表面存在桥式和甲氧碳酸酯基两种吸附态,其中甲氧碳酸酯基吸附态是生成DMC的关键物种;CH3OH在催化剂上只有一种分子吸附态。在150℃以下,CO2和CH3OH在Ti2(OMe)4/SiO2催化剂表面上高选择地生成碳酸二甲酯。 相似文献
108.
A polystyrene-bonded stannic chloride catalyst was synthesized by the method of lithium polystyryl combined with stannic chloride. This catalyst is a polymeric organometallic compound containing 0.25 mmol Sn (Ⅳ)/g catalyst. The catalyst showed sufficient stability and catalytic activity in organic reaction such as esterification, acetalation and ketal formation, and it could be reused many times without losing its catalytic activity. 相似文献
109.
Ilaria Serafini Livia Lombardi Claudia Fasolato Manuel Sergi Francesca Di Ottavio Fabio Sciubba 《Natural product research》2019,33(7):1040-1051
AbstractIn this paper, the application of a multi-analytical approach for the characterisation of synthetic and natural dyes in a historical textile is presented. The work is focused on a historical dress of a Sicilian noblewoman, dating from about 1865–1870. Firstly, SERS on fibre was performed, in order to individuate the classes of dyes employed. The SERS spectra suggested the presence of two main dyes: mauveine and orcein. In order to confirm these preliminary results, two different extraction protocols were applied. The extracts obtained were analysed by ESI-MS, MALDI-ToF and UHPCL-MS analyses, confirming the SERS results. In particular, the application of the ammonia mild extraction technique allowed to selectively extract the phenoxazonic dyes, separating them already in the extraction step from the synthetic ones. Thanks to this multi-analytical approach, this dress could be considered as one of the first examples of employment of synthetic dyes in association with natural ones. 相似文献
110.
硝基芳烃氢化还原反应中高分子负载催化剂的双金属协同效应 总被引:8,自引:0,他引:8
制备了聚N-乙烯基-2-吡咯烷酮PVP负载钯催化剂Pd/PVP及各种双金属催化剂(1-m)Pd-mM/PVP,并用于硝基芳烃的加氢还原中,其中Pd/PVP中加入H2PtCl6的效果最佳,碱的用量、溶剂和Pd、Pt的比例都对催化剂的活性有明显的影响,双金属催化剂0.80Pd-0.20Pt/PVP在温和条件下能高活性,高选择性地催化硝基芳烃还原,得到相应的芳胺。 相似文献