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本文详细地研究了二氧化碳、氢气在CuO-ZnO-Al_2O_3催化剂上、2MPa压强下合成甲醇的反应,考察了催化剂在不同操作条件下的催化活性。运用XRD,SEM、BET、ESR、XPS、FT-IR等手段对催化剂的结构、组成、热稳定性及其表面性质进行了研究。实验证明,在Al_2O_3的含量为2—7%时,能得到较好的催化活性和选择性,提高催化剂的预还原温度,有助于提高催化剂的活性。并且发现在甲醇的合成过程中,催化剂的活性组份主要是以Cu°的形式存在。在催化剂表面形成的中间物种主要是铜的甲酸盐。本文还对合成甲醇的反应机理进行了初步探讨。
In this paper, the reaction of carbon dioxide and hydrogen over CuO-ZnO-Al_2O_3 catalyst under 2MPa pressure was studied in detail. The catalytic activity of the catalyst under different operating conditions was investigated. The structure, composition, thermal stability and surface properties of the catalyst were investigated by XRD, SEM, BET, ESR, XPS and FT-IR. Experiments show that when the content of Al 2 O 3 is 2-7%, better catalytic activity and selectivity can be obtained, and the pre-reduction temperature of the catalyst can be increased, which helps to improve the activity of the catalyst. And found in the synthesis of methanol, the active component of the catalyst is mainly in the form of Cu °. The intermediate species formed on the catalyst surface is predominantly copper formate. In this paper, the reaction mechanism of methanol synthesis was also discussed.