Mn_(3)O_(4)/AC催化剂的制备及其催化甲苯燃烧性能研究

Preparation of Mn_(3)O_(4)/AC catalyst and its performance study on catalytic toluene combustion

为制备高效环保的过渡金属催化剂,促进甲苯氧化,利用原位生长法、原位氧化还原沉淀法和沉淀沉积法合成了三种不同的Mn_(3)O_(4)/AC催化剂。采用XRD、SEM、N_(2)吸附-脱附、TPR、TPD等表征手段,分析Mn_(3)O_(4)/AC催化剂的结构,并通过甲苯的转化率评估其对甲苯的催化性能。结果表明,采用原位氧化还原沉淀法合成的Mn_(3)O_(4)/AC-RP催化剂具有最高效的催化甲苯燃烧活性,在质量空速为20000 mL/(g·h),甲苯体积分数为1000×10^(-10)的条件下,在210℃时实现了对甲苯的完全转化,这与其优异的氧化还原能力和晶格氧移动性有关。

This paper seeks to prepare an efficient and environmentally friendly transition metal catalysts for better toluene oxidation.The study involves synthesizing three different Mn_(3)O_(4)/AC catalysts with the in-situ growth method,in-situ redox precipitation method and deposition-precipitation method,performing the structural analysis of Mn_(3)O_(4)/AC catalysts by using the characterized methods,such as XRD,SEM,N_(2) adsorption-desorption,TPR and TPD,and evaluating the catalytic performance on toluene based on toluene conversion.The results show that Mn_(3)O_(4)/AC-RP catalyst synthesized by in-situ redox precipitation method has the most efficient catalytic toluene combustion activity,the complete conversion of toluene is at 210℃under the condition of the weight hourly space velocity of 20000 mL/(g·h)and the toluene volume fraction of 1000×10^(-10),as which is related to its excellent redox ability and lattice oxygen mobility.