论文部分内容阅读
利用TPR,Mssbauer谱等技术研究了ZSM-5沸石的碱改性及MnO等因素对铁-锰/沸石催化剂中铁的还原过程及难易程度的影响。随改性ZSM-5沸石碱性的增强,金属活性组分TPR耗氢峰温向高温方向位移,即还原过程发生变化,铁变得更难被还原。首次研究了担载型Fe-MnO催化剂中MnO的助剂作用,表明分子筛担载型催化剂中MnO是铁还原的促进剂。解释了碱改性ZSM-5担载Fe-MnO催化剂中影响催化活性的各种因素,并与实验结果进行了关联。
The effect of alkali modification and MnO on the reduction process and the ease of iron in Fe-Mn / zeolite catalysts was investigated by TPR and Mssbauer spectroscopy. With the enhancement of the basicity of the modified ZSM-5 zeolite, the peak temperature of the TPR peak of the metal active component shifts to high temperature, that is, the reduction process changes, and the iron becomes harder to be reduced. The effect of MnO promoter in supported Fe-MnO catalyst was first studied. It is shown that MnO is the promoter of Fe reduction in molecularly supported catalyst. The various factors affecting the catalytic activity of the alkali-modified ZSM-5 supported Fe-MnO catalyst were explained and correlated with the experimental results.