超细Cu-ZnO-ZrO_2催化剂的制备及其催化CO_2加氢合成甲醇的性能

Preparation of Ultrafine Cu-ZnO-ZrO_2 Catalysts and CO_2 Hydrogenation Performance

采用溶胶 凝胶法、共沉淀法和共沸蒸馏法制备了一系列不同粒度范围的超细Cu ZnO ZrO2 催化剂 ,并应用BET ,XRD ,TEM和TPR等物理化学方法对催化剂的结构和物化性质进行了表征 ,同时考察了催化剂上CO2 加氢合成甲醇的反应性能 .结果表明 ,超细Cu ZnO ZrO2 催化剂具有粒度小、颗粒分布均匀和稳定性好的特点 ,并发现超细Cu ZnO ZrO2 催化剂比大颗粒的工业Cu ZnO Al2 O3 催化剂具有更高的催化活性 ,而且随着催化剂粒度的减小 ,甲醇合成活性进一步增大 .研究还发现 ,ZrO2 具有稳定反应活性中心的作用 .

A series of ultrafine particle (UFP) Cu ZnO ZrO 2 catalysts, which were prepared by the sol gel, coprecipitation and azeotropic distillation methods respectively, were investigated by TEM, BET and XRD techniques. The results show that the particles of the catalysts are in the nanometer size range, and have high dispersion and stability. The catalytic performance of these catalysts for CO 2 hydrogenation indicates that the UFP Cu ZnO ZrO 2 catalysts have apparently higher activity than the commercial Cu ZnO Al 2O 3 catalyst. With the decreasing of the particle size, methanol space time yield increases. It has also been found that ZrO 2 plays the role of stabilizing the active centers.