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Vapor-phase Catalytic Synthesis of 3-methylindole from Aniline and Gylcerol

Author: LiuDongZuo
Tutor: ShiLei
School: Liaoning Normal University
Course: Physical and chemical
Keywords: Cu/SiO2-Al2O3 catalyst 3 - methyl - indole Aniline Glycerol
CLC: TQ252
Type: Master's thesis
Year: 2010
Downloads: 43
Quote: 2
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Abstract


3 - methylindole spice and medicine , and other fields have a wide range of uses , is an important indole derivatives and synthetic intermediates . The paper reported that a synthetic 3 - methylindole new method , namely Cu / SiO 2 - Al 2 O 3 catalyst step vapor phase catalytic synthesis of 3 - methyl- indole from aniline and glycerol as raw materials . Compared with the traditional liquid phase synthesis wears , the method is simple , low cost , and avoid the use of large amounts of toxic organic solvents . Equal volume prepared by impregnation Synthesis of 3 - methylindole catalyst for aniline and glycerol gas , atmospheric gas-solid phase reaction and XRD H 2 -TPR , NH -TPD, TG and BET characterization methods of the catalysts in-depth study . The studies show that the Cu / SiO 2 - Al- 2O 3 catalysts showed a higher activity and selectivity of aniline and glycerol step catalytic synthesis of 3 - methylindole sex . The metallic copper is the reaction of the active species . The number of weak acid sites of copper catalyst copper dispersity Good conducive to the synthesis of 3 - methylindole . Through optimization of the catalyst preparation conditions and the reaction conditions determine the best operating conditions , i.e. the catalyst directly from room temperature was raised to 500 ° C and in the calcination temperature 4 h , in the composition of hydrogen 30 mL / min, nitrogen gas of 30 mL / min 250 ℃ in situ reduction to restore the air-fuel mixture in 2 h and a reaction temperature of 240 ℃, pass into the hydrogen, nitrogen, and water content in the reaction were 10 mL / min , 58 mL / min and 12mL/min when , beneficial 3 - A the synthesis of the group indole , 3 - methylindole yield can reach 46%. Reaction 40 h, 3 - methylindole yield can reach 35% . The catalyst deactivation because of the copper particles in the course of the reaction sintering and the coking of the catalyst surface .

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