Continuous synthesis of bis(indolyl)phenylmethane over acid modified Hβ zeolite
Continuous synthesis of bis(indolyl)phenylmethane over acid modified Hβ zeolite
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DOI：
10.1016/j.apcata.2012.03.040
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发表时间：
2012-06-15
影响因子：
5.5
通讯作者：
Liu, Peide
中科院分区：
文献类型：
--
作者：
Bai, Guoyi;Ma, Zheng;Liu, Peide
首次在固定床反应器中，通过不同沸石上吲哚与苯甲醛的Friedel-Crafts烷基化反应，成功地连续合成了双（吲哚基）苯甲烷。通过brunauer - emmet - teller （BET）法、NH3程序升温解吸法（NH3- tpd）和吸附吡啶后的傅里叶变换红外光谱仪（Py-IR）证实，柠檬酸修饰的H β (CA-H β)分子筛比母体H β分子筛具有更大的表面积和更少的弱酸位点，具有更好的催化性能。此外，还提出了柠檬酸处理适合于H - β沸石的脱铝处理，这使得CA-H - β沸石具有更多的活性中心以进行所需的转化。值得注意的是，CA-H β在100小时的测试中表现出良好的稳定性。(C) 2012 Elsevier B.V.版权所有
The continuous synthesis of bis(indolyl)phenylmethane has been successfully accomplished for the first time by Friedel-Crafts alkylation of indole with benzaldehyde in a fixed-bed reactor over different zeolites. A citric acid modified H beta (CA-H beta) zeolite showed better catalytic performance than parent H beta zeolite due to its larger surface area and smaller amount of weak acid sites, confirmed by the Brunauer-Emmett-Teller (BET) method, NH3 temperature-programmed desorption (NH3-TPD) and Fourier Transform Infrared Spectrometer after adsorption of pyridine (Py-IR). Furthermore, it is proposed that citric acid treatment is appropriate for dealumination of H beta zeolite, which results in the CA-H beta zeolite having a larger number of active centers for the desired transformation. Significantly, CA-H beta has shown good stability during a 100 h test. (C) 2012 Elsevier B.V. All rights reserved.