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使用浸渍法制备不同负载量的Cr/γ-Al2O3催化剂,研究乙酸乙酯的催化燃烧.BET,XRD结果表明,Cr在γ-Al2O3上负载存在分散阈值效应,负载量在阈值以下时呈单层分散形式,在超过阈值时Cr形成结晶,实验测得单层分散阈值与理论计算一致.Raman结果表明Cr在单层分散时为Cr6+,而在非单层分散时为Cr2O3.催化乙酸乙酯燃烧的活性研究显示,阈值效应对催化活性有显著影响:催化活性在单层分散阈值时最好,此时活化能最高,指前因子最大.
The impregnation method was used to prepare Cr / γ-Al2O3 catalysts with different loadings to study the catalytic combustion of ethyl acetate.The results of BET and XRD showed that the dispersion threshold effect of Cr on γ-Al2O3 was present and the loading was below the threshold Dispersed form, Cr exceeds the threshold when the formation of crystallization, the experimental measured monolayer dispersion threshold and theoretical calculations .Raman results show that when Cr is monolayer dispersed Cr6 +, when dispersed in a non-monolayer Cr2O3 catalytic ethyl acetate combustion The activity studies have shown that the threshold effect has a significant effect on the catalytic activity: the catalytic activity is best at the monolayer dispersion threshold, and the activation energy is the highest at this time, with the highest pre-exponential factor.