高缺陷型rGO@MnO_(x)复合材料催化氧化甲苯的性能

Performance of highly defective rGO@MnO_(x) composites for catalytic oxidation of toluene

为降低挥发性有机物的排放,探索高效催化氧化甲苯的催化剂,利用共沉淀法设计制备了以还原氧化石墨烯(rGO)为碳基底的α型MnO_(2)催化剂rGO@MnO_(x),通过对rGO@MnO_(x)复合材料系列催化剂进行结构表征和分析,探究rGO掺量对rGO@MnO_(x)复合材料催化氧化甲苯性能的影响。结果表明:以rGO作为碳基底原位生长的rGO@MnO_(x)复合材料催化剂,具有大的比表面积、更多的晶格缺陷,丰富的催化氧化活性位;催化剂展现出增强的低温还原性、高效的表面晶格氧迁移率以及高效的催化氧化甲苯活性。甲苯转化率达90%的温度低至202℃。

This paper aims to reduce the emission of volatile organic compounds by exploring more efficient catalysts for catalytic oxidation of toluene.The study involves designing and preparingα-type MnO_(2)catalysts rGO@MnO_(x)by taking reduced graphene oxide(rGO)as carbon substrate in using co-precipitation method;characterizing and analyzing the structure of rGO@MnO_(x)compositeseries catalysts;studying the effcct of rGO doping on the performance of rGO@MnO_(x)composites for catalytic oxidation of toluene.The results show that the in-situ grown rGO@MnO_(x)composite catalyst with rGO as the carbon substrate presents larger specific surface area,more lattice defects and more abundant active sites for catalytic oxidation;the catalysts exhibit enhanced low-temperature reduction,efficient surface lattice oxygen mobility and highly efficient catalytic toluene oxidation activity;and the temperature at the toluene conversion rate 90%is as low as 202℃.