Enhancement effect of acid treatment on Mn2O3 catalyst for toluene oxidation
Enhancement effect of acid treatment on Mn2O3 catalyst for toluene oxidation
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酸处理对Mn2O3催化剂甲苯氧化的增强效果
DOI：
10.1016/j.cattod.2018.04.041
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发表时间：
2019-05
期刊：
影响因子：
5.3
通讯作者：
Ge Maofa
中科院分区：
文献类型：
--
作者：
Yang Xueqin;Yu Xiaolin;Lin Mengya;Ma Xiuyun;Ge Maofa
考察了酸处理对氧化锰催化氧化甲苯的影响。酸处理对催化剂的织构性质没有明显影响，但能显著提高催化剂的催化性能，特别是低浓度酸处理的催化剂。酸处理的催化剂表现出相对较高的表面Mn 4+含量，沿着，并可能形成空位缺陷。结构缺陷进一步促进了表面氧的迁移和低温还原，这是显著提高甲苯氧化所不可或缺的。结果表明，随着酸浓度的增加，甲苯的比反应速率增加，反应活化能降低。原位DRIFTS结果表明，在甲苯氧化过程中产生的中间体，如醇盐，苯甲醛，苯甲酸酯，和马来酸酐物种。
The effect of acid treatment on manganese oxide samples has been investigated for catalytic oxidation of toluene. The acid treatment had no obvious influence on the textural properties of catalysts, but could remarkably improve the catalytic performance of catalysts, especially the catalysts acid-treated with low acid concentration. The acid-treated catalysts exhibited the relatively high amount of surface Mn4+along with the probable formation of vacancy defectsviathe disproportionation of Mn3+by acid leaching. The structural defects could further contribute to the good surficial oxygen mobility and the low-temperature reducibility, which is indispensable for the significant enhancement of toluene oxidation. As a result, the specific toluene reaction rate increased and the activation energy decreased with the increase of acid concentration. In situ DRIFTS results indicated that the intermediates such as alkoxide, benzaldehyde, benzoate, and maleic anhydride species were produced during the toluene oxidation process.
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