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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%。
ZnFe2O4 / ZnO catalyst was prepared by improved citric acid complexation method and was used for cyclodehydrogenation of ethylenediamine and 2,3-butanediol to prepare alkylpyrazine. The catalysts were characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). The effects of Zn / Fe molar ratio, reaction temperature and carrier gas space velocity on the conversion of 2,3-butanediol and the selectivity of alkylpyrazines were investigated. The results showed that the molar ratio of 2,3-butanediol to 2,3-butanediol at n (Zn): n (Fe) = 2:1, reaction temperature 380 ℃, feed solution flow rate 0.02 mL / min and carrier gas space velocity 1 440 h- The conversion was 93.38%. The yield of alkylpyrazine was 85.47%. The yield of 2,3-dimethyl pyrazine was 22.16% and the yield of 2-methyl pyrazine was 63.31%.