摘要
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。
Methanol synthesis reaction from carbon dioxide and hydrogen over CuO-ZnO-Al_2O_3 catalysts under 2 MPa pressure was studied in detail. The activity of catalysts under different operation condition was examined. XRD, SEM, BET ESR, XPS and FT-IR were used to characterize the structure composition, thermal stability and surface properties of catalyst. Good catalytic activity and good methanol selectivity were obtained as the content of A1_2O_3 in catalyst was 2-7w%. And the catalytic activity had been enhanced when the reduction temperature of catalyst was raised from 260℃ to 300℃.Cu was found to be the active state of catalyst in the reaction of methanol synthesis whereas copper formate is the reaction intermediates on the catalyst surface. The reaction mechanism of methanol formation from carbon dioxide and hydrogen is discussed further.
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1992年第2期138-145,共8页
Journal of Fuel Chemistry and Technology
关键词
二氧化碳
氢气
甲醇
催化剂
catalyst
carbon dioxide
hydrogen
methanol synthesis
