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通过共沉淀法制备了Al、Zr和Ce改性的Cu-ZnO基低温甲醇合成催化剂,采用氮气物理吸附、H2-TPR、CO2-TPD、N2O滴定、XRD和TEM等技术对其进行了表征,并考察了改性组分和煅烧温度对其在170℃下合成气制甲醇催化性能的影响。结果表明,经Zr改性的Cu-ZnO基催化剂,其低温甲醇合成性能较好;随着煅烧温度的降低,Cu在催化剂表面的分散度逐渐变大、颗粒逐渐变小,所得到的催化剂其活性也较高;其中,未经煅烧的Cu-ZnO/ZrO2催化剂的活性最佳,其甲醇时空产率为106.02 g/(kg·h),选择性达87.04%。
Al, Zr and Ce modified Cu-ZnO-based low-temperature methanol synthesis catalysts were prepared by coprecipitation method and characterized by physical adsorption of nitrogen, H2-TPR, CO2-TPD, N2O titration, XRD and TEM. The effects of the modified components and calcination temperature on the catalytic performance of methanol at 170 ℃ were also investigated. The results show that the Zr-modified Cu-ZnO-based catalyst has better methanol synthesis performance at low temperature. With the decrease of calcination temperature, the dispersion of Cu on the catalyst surface gradually becomes larger and the particles become smaller gradually. Among them, the activity of Cu-ZnO / ZrO2 without calcination was the best, its space time yield of methanol was 106.02 g / (kg · h), and the selectivity was up to 87.04%.