原位漫反射FTIR研究Fe改性的Cu-Mn/ZrO_2催化剂上CO的吸附行为

In-situ Diffuse Reflectance FTIR Study of CO Adsorption on Iron-modified Cu-Mn/ZrO_2 Catalysts

利用原位漫反射傅里叶变换红外光谱(FTIR)技术,研究了Fe改性的Cu-Mn/ZrO_2催化剂的CO吸附行为。通过测定单组元及其不同组合催化剂的CO吸附以及催化剂的CO-TPD-IR特征、不同温度CO吸附的红外光谱,研究了Fe助剂对催化剂上CO吸附行为的影响,发现Fe通过提高铜的分散度,改变铜的化学环境,影响催化剂上CO线式吸附的特征,而且形成CO桥式吸附中心,从而提供了低碳醇合成的催化剂表面,并探讨了催化剂上CO吸附形式变化的规律。

The Fe-modified Cu-Mn/ZrO2 catalysts for higher alcohols synthesis were studied by in-situ diffuse reflectance FTIR using CO as probe molecules. The variables investigated included the adsorption of CO on model catalysts, CO thermal desorption, and CO adsorbed at different temperatures. Based on these factors, it was found that Fe could improve the adsorption of CO on Cu and made the IR bands shift to higher frequencies. The results of CO thermal desorption revealed that the change in Cu chemical surroundings on catalyst surface occurred because of the addition of Fe to the Cu-Mn/ZrO2 catalyst. In addition, CO adsorbed on Fe-Cu-Mn/ZrO2 at different temperatures indicated that Fe favored the formation of bridged-type adsorbed CO, and the Fe promoter changed the CO adsorption properties of Cu on the catalyst surface.