辉光放电等离子体对合成甲醇用铜基催化剂的改性作用

以辉光放电等离子体方法制备了新型高效铜基催化剂, 应用XRD、SEM、H2-TPR、BET、H2-TPD、CO-TPD技术以及对CO加氢合成甲醇反应进行研究, 分析了在氮气、氢气或先氮气后氢气等方式的不同气氛中进行等离子体处理对铜基催化剂的结构和性能的影响. 结果表明, 催化剂前体经等离子体改性处理后, 样品的比表面积增大, 活性中心数增加; 当等离子体气氛为先氮气后氢气时, 催化剂上的CO加氢活性和甲醇的时空产率显著提高.

Effect of Glow Discharge Plasma on Copper-based Catalysts for Methanol Synthesis

Copper-based catalysts for methanol synthesis were prepared by glow discharge plasma.These catalysts were characterized using X-ray diffraction(XRD),scanning electron microscopy(SEM),surface area measurement(BET method),hydrogen temperature programmed desorption(H2-TPD),and carbon monoxide temperature programmed desorption(CO-TPD).The catalytic performances of these samples were measured in methanol synthesis from the hydrogenation of carbon monoxide.After plasma enhancement in N2 and then in H2,the conversion of carbon monoxide was 2.61 times higher than that of the conventional sample.Meanwhile,the space time yield(STY)of methanol was 2.65 times higher,and the amount of surface active sites on the catalysts increased as evidenced by TPD experiments.