【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)、傅里叶变换红外光谱(FTIR)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0.02 mL/min、载气空速1 440 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%。更多还原

【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 FTIR. The effect of Zn / Fe molar ratio,reaction temperature and carrier gas space velocity on the conversion of 2,3-butanediol and selectivity of alkylpyrazines was studied. The results indicate that the optimum conditions for the synthesis of alkylpyrazines were as follows: the molar ratio of Zn and Fe was 2∶1,the reaction temperature was 380 ℃,the raw material liquid flow rate was 0. 02 mL / min,and the space velocity of carrier gas was 1 440 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%.更多还原