ZnFe2O4/ZnO气相法催化合成烷基吡嗪的研究

Gas-phase catalytic synthesis of alkylpyrazines on ZnFe2O4/ZnO

摘要:

：改进的柠檬酸络合法制备了ZnFe2O4/ZnO催化剂，并用于乙二胺和2，3-丁二醇环化脱氢制备烷基吡嗪。用 X 射线衍射(XRD)、傅立叶红外光谱（FT-IR）对催化剂进行了表征。考察了Zn/Fe摩尔比、反应温度、载气空速对2，3-丁二醇转化率和烷基吡嗪选择性的影响。结果表明，在n(Zn):n(Fe)=2:1、反应温度380℃，原料液流速0.02mol/min，载气空速1440 h-1时，2，3-丁二醇的转化率为93.38%，烷基吡嗪的收率为85.47%，其中2，3-二甲基吡嗪的收率为22.16%、2-甲基吡嗪的收率为63.31%。

Abstract:

The ZnFe2O4/ZnO catalyst was prepared by an improved amorphous citric precursor method, and was applied in the cyclodehydration of diamine and 2,3- butanediol to synthesize alkylpyrazines.The catalyst was characterized by means of XRD and FT-IR. The effects of Zn/Fe molar ratio, reaction temperature, carrier gas space velocity on the conversion of 2,3-butanediol and selectivity of alkylpyrazines were studied in detail. The results indicate that the optimum conditions for the synthesis of alkylpyrazines were n(Zn):n(Fe)=2:1, reaction temperature 380℃, material flow rate 0.02mol/min, carrier gas space velocity 1440 h-1. The conversion of 2,3-butanediol was 93.38% and the selectivity of alkylpyrazines was 85.47% . The yield of 2,3-dimethylpyrazine was 22.16%.The yield of 2-methylpyrazine was 63.31%.