• continuous synthesis of bis(indolyl)phenylmethane over acid modified hβ zeolite

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
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     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 hβ (ca-hβ) zeolite showed better catalytic performance than parent hβ 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 hβ zeolite, which results in the ca-hβ zeolite having a larger number of active centers for the desired transformation. significantly, ca-hβ has shown good stability during a 100 h test.

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