时间分辨红外光谱法测定乙醛的降解

Study of the degradation of acetaldehyde by time-resolved infrared spectrometry

摘要: 采用1种新的方法——时间分辨红外光谱法,监测了MCM-41,Co-MCM-41在暗反应情况下乙醛降解的反应过程.检测了相关产物以及它们随时间变化的情况,结果表明,在Co-MCM-41降解乙醛体系中,检测到了醋酸钴盐、甲烷和水的生成,并且一段时间后它们的浓度随反应时间的延长而逐步增加.而在MCM-41降解乙醛体系中只监测到乙醛的吸附过程,并无降解反应发生.

Abstract: The degradation kinetics of acetaldehyde in the gas phase over MCM-41 and Co-MCM-41 under dark condition was studied by time-resolved Infrared spectrometry.It was found that Co-MCM-41 is an efficient catalyst for acetaldehyde degradation under room temperature.The formation of water and acetate over Co-MCM-41 was detected,and their concentrations were increased with the increase of reaction time.By contrast,MCM-41 is a negative catalyst to acetaldehyde degradation even though it showed strong adsorption to acetaldehyde.