CO2加氢合成甲醇的超细Cu-ZnO-ZrO2催化剂的表征

采用原位顺磁共振（ＥＰＲ）、原位Ｘ射线光电子能谱（ＸＰＳ）和程序升温还原（ＴＰＲ）等手段，对ＣＯ２加氢合成甲醇用的不同粒度的超细Ｃｕ－ＺｎＯ－ＺｒＯ２催化剂各组分的相互作用进行了研究。结果表明，ＺｒＯ２的加入改变了催化剂的表面结构和配位状态，增加了活性组分的分散度，提高了催化剂的稳定性。实验还发现，催化剂的粒度对各组分的相互作用有着重大的影响，催化剂的粒度较小时，Ｃｕ＾２＋主要以团簇的形式存在，易

Characterization of Ultrafine Cu-ZnO-ZrO2 Catalysts for Methanol Synthesis via CO2 Hydrogenation

Ultrafine Cu ZnO ZrO 2 catalysts for methanol synthesis via CO 2 hydrogenation were characterized by in situ electron paramagnetic resonance (EPR), in situ X ray photoelectron spectroscopy (XPS) and atomic emission spectrometry (AES), and temperature programmed reduction (TPR). The results show that the addition of ZrO 2 promoted the dispersion of the catalysts remarkably, and changed the surface construction and coordination. The particle size of the catalysts has great influence on the interaction of the catalyst components. When the particle size is small, Cu 2+ exists as cluster, and is easily to be reduced. When the particle size is large, Cu 2+ is more likely to exist as isolated atom distributing among ZnO and ZrO 2. The clusters of Cu, rather than isolated Cu, are evidenced to be the active centers for methanol synthesis via CO 2 hydrogenation.