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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Synthesis, properties and mechanism of the ion exchange resins based on 2-methyl-5-vinylpyridine and divinylbenzene in the catalytic disproportionation of trichlorosilane
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Synthesis, properties and mechanism of the ion exchange resins based on 2-methyl-5-vinylpyridine and divinylbenzene in the catalytic disproportionation of trichlorosilane

机译：基于2-甲基-5-乙烯基吡啶和二乙烯基苯催化歧化的离子交换树脂的合成，性质和机理，三氯硅烷催化丧失

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摘要

The variety of catalysts based on macroporous ion exchange resins using 2-methyl-5-vinylpyridine cross-linked with divinylbenzene (2M5VP/DVB) was investigated in the disproportionation of trichlorosilane (TCS) in a continuous-flow reactor. The effects of the reaction temperature and surface area on TCS disproportionation kinetics was invesitigated using three types of catalysts based on 2M5VP/DVB with a different pore ratios (to-luene(tol)/heptane(hep)) and in the temperature range of 333.2 K and 453.2 K. The results indicate that within this range, the higher reaction temperatures result in an increase in the conversion rate to TCS at equilibrium. The effects on the specific catalyst surfaces were determined and the catalyst (2M5VP/DVB-hep/tol) with the highest specific surface area exhibited better catalytic activity. Variable temperature studies on the catalytic activity of 2M5VP/DVB-hep/tol revealed an activation energy of 24,06 +/- 0.72 kJ mol(-1) for 2M5VP-hep/tol and 34.30 +/- 1.03 kJ mol(-1) for Amberlyst A-21 resins. TCS disproportionation was investigated using a non stationary process and showed the desorption of STC from the active sites of the catalyst to be the rate determining step. Using FTIR analysis, we have already established that the resin after exposure to HCI or TCS undergoes protonation of the nitrogen atom in the pyridine ring with intermediate formation of N+H center dot center dot center dot Cl-/N+H center dot center dot center dot SiCl3- . Based on the reaction data obtained in this study, a probable mechanism of the reaction has been proposed.
机译：在连续流动反应器中的三氯硅烷（TCS）的歧化中研究了基于二甲基-5-乙烯基吡啶的多孔离子交换树脂的各种催化剂。使用基于2M5VP / DVB的三种催化剂具有不同的孔比（对丁烯（甲庚烷（HEP））和333.2的温度范围，使用三种催化剂对TCS歧化动力学对TCS歧化动力学进行侵袭。 K和453.2 K.结果表明在该范围内，较高的反应温度导致转化率的转化率增加到平衡。测定对特定催化剂表面的影响，并且具有最高比表面积的催化剂（2M5VP / DVB-HEP / Tol）表现出更好的催化活性。对2M5VP / DVB-HEP / Tol的催化活性的可变温度研究显示了24,06 +/- 0.72 kJ摩尔（-1）的活化能，适用于2m5Vp-Hep / Tol，34.30 +/- 1.03 kJmol（-1 ）对于Amberlyst A-21树脂。使用非静止过程研究了TCS歧化，并从催化剂的活性位点显示STC的解吸为速率确定步骤。使用FTIR分析，我们已经确定了暴露于HCl或TCs后的树脂在吡啶环中经历氮原子的质子化，中间形成N + H中心点中心点中心点Cl- / N + H中心点中心点中心点SiCl3-。基于本研究中获得的反应数据，已经提出了反应的可能机制。

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