排序方式: 共有7条查询结果,搜索用时 15 毫秒
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煤焦油萘择形异丙基化产物组成的气相色谱/质谱分析 总被引:3,自引:0,他引:3
采用毛细管气相色谱 /质谱 (CGC/MS)联用技术 ,经计算机质谱库检索并结合人工谱图解析 ,研究了在不同沸石分子筛催化剂上煤焦油萘择形异丙基化产物的组成。研究结果表明 ,煤焦油萘异丙基化产物主要由一取代萘、二取代萘以及少量三取代萘组成 ;除 HZSM-5活性较低以外 ,其它催化剂均有较高的反应活性 ,其中 HY和 Hβ反应活性最高 ,萘转化率分别达 75 .1 5 %和 5 5 .96% ,但β位产物的选择性较差 ;ZM类催化剂既有一定的活性 ,又有较高的β选择性 ,是萘择形异丙基化反应理想的备选催化剂。 相似文献
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Gyula Tasi István Pálinkó Fujio Mizukami 《Reaction Kinetics and Catalysis Letters》2001,74(2):317-322
A first principle quantum chemical method for determining the shape of molecules has been elaborated and its value in interpreting the experimentally found shape selectivity in isopropylation of isopropylnaphthalene on H-mordenite zeolite is demonstrated. In line with experimental results, it is found that 2,6-diisopropylnaphthalene is the most feasible product since it diffuses through the main channels of mordenite the easiest among the possible isomers. 相似文献
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Large pore aluminophosphate-based molecular sieves like AlPO4-5, MAPO-5, MnAPO-5 and ZAPO-5 were synthesised hydrothermally using triethylamine as a structure directing agent. These materials
were characterised by X-ray diffraction (XRD),27A1 and31P MAS-NMR, ICP-MS,n-butylamine-TPD, BET and SEM. The catalytic performance of these materials was tested for isopropylation of benzene with 2-propanol
at 250, 300, 350 and 400°C. The products were cumene,p-DIPB (p-diisopropylbenzene) andm-DIPB (m-diisopropylbenzene). MnAPO-5 was found to be more active than the other catalysts. Maximum conversion (20%) was noted at
350°C over MnAPO-5. The selectivity to DIPB was found to decrease with time on stream but the selectivity to cumene showed
an increase after 3 h of time on stream 相似文献
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Surface chemical modification of zeolites and their catalytic performance for naphthalene alkylation 总被引:2,自引:0,他引:2
Acid-catalyzed naphthalene alkylation products, such as 2,6-dialkylnaphthalenes (2,6-DAN), are industrially important compounds used to make monomers for advanced polymer materials [1]. Zeolite molecular sieves can be extensively used in many catalytic applications, specifically in naphthalene alkylations due to their high activity and stability as well as their high selectivity. The initial studies have mainly focused on gas phase alkylation of naphthalene with methanol, and only obtained th… 相似文献
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G. Bonilla T. D. Pletcher G. Haas J. Lauterbach 《Reaction Kinetics and Catalysis Letters》1998,65(1):3-8
The alkylation of naphthalene with isopropanol was investigated over a HY (Si/Al=4) zeolite under the following conditions:
flow reactor, liquid phase with decalin as solvent, 623 K, 40 bar. Despite complete filling of the zeolite pores by coke during
the first hour of reaction, the rate of formation of isopropylnaphthalene remained very high. This is due to the development
of a new reaction process involving transalkylation between the polyisopropyl naphthalenes entrapped in the pores and naphthalene
followed by the realkylation of the former compounds with isopropanol. 相似文献
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沸石分子筛催化剂上萘的择形异丙基化反应性能 总被引:17,自引:0,他引:17
研究了HY,Hβ,HM和HZSM-5沸石分子筛对萘择形异丙基化反应的催化性能.结果发现,这些沸石分子筛的活性顺序为HY>Hβ>HM>HZSM-5,对2,6-二异丙基萘的选择性顺序为HM>Hβ>HY.除沸石分子筛的酸量与酸分布外,其孔道结构与大小是影响萘异丙基化反应的主要因素.脱铝能选择性地降低沸石外表面的酸性,且对沸石的催化性能有较大影响.常压水蒸气脱铝结合强酸再处理有利于催化剂催化性能的提高.提高反应温度有利于萘的转化,但温度过高会引发许多副反应,适宜的反应温度约为523K.反应时间对产物分布的影响不明显.异丙醇/萘摩尔比应小于2. 相似文献
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