• 关键词：酸处理  堇青石  微波催化燃烧  甲苯  表征

• 基金项目：陕西省自然科学基金资助项目（No.2021JM-364）

• 李荣乐
• 西安建筑科技大学环境与市政工程学院，西安 710055

• 郑可昕
• 西安建筑科技大学环境与市政工程学院，西安 710055

• 赵华
• 西安建筑科技大学环境与市政工程学院，西安 710055

• 李明昕
• 西安建筑科技大学环境与市政工程学院，西安 710055

• 卜龙利
• 西安建筑科技大学环境与市政工程学院，西安 710055;教育部西北水资源与环境生态重点实验室，西安 710055;陕西省环境工程重点实验室，西安 710055

• 摘要：针对堇青石载体比表面积小、活性组分分散程度低等问题，本研究使用盐酸对蜂窝状堇青石载体进行酸蚀处理以增大其比表面积.在采用等体积浸渍法制备CuMnCeO_x/酸蚀堇青石催化剂的基础上，开展了微波催化燃烧甲苯试验以考察酸处理对催化剂活性的影响，同时对CuMnCeO_x/堇青石与CuMnCeO_x/酸蚀堇青石催化剂进行BET、SEM、PSDA和XRD等表征测试.结果表明，堇青石载体的比表面积由酸蚀前的0.153 m²·g^-1提高至酸蚀后的1.024m²·g^-1；酸蚀未改变堇青石载体的晶体结构，同时CuMnCeO_x/酸蚀堇青石活性组分的特征峰相较于CuMnCeO_x/堇青石催化剂有所增多.在处理气量为0.12m³·h^-1、甲苯初始浓度为1000 mg·m^-3和床层温度为160 ℃的反应条件下，CuMnCeO_x/酸蚀堇青石催化剂对甲苯的去除效率为90%左右，高于CuMnCeO_x/堇青石催化剂约10%，矿化率由78%提升至82%.5个循环周期共计600 min的稳定性试验结果证实甲苯的去除率保持在85%~95%，表明CuMnCeO_x/酸蚀堇青石催化剂具有高活性和良好的稳定性.本研究可为高活性 催化剂的制备及其微波催化燃烧实际VOCs废气提供技术理论支持.

• Abstract：In order to solve the problems of small specific surface area and low dispersion of active components for cordierite carrier， honeycomb cordierite was etched by hydrochloric acid solution to improve its specific surface area， and then CuMnCeO_x/acid-etched cordierite catalyst was prepared by equivalent-volume impregnation method in this study.The effect of acid treatment on the catalyst activity was investigated by microwave catalytic combustion of toluene and then CuMnCeO_x/cordierite and CuMnCeO_x/acid-etched cordierite were characterized by BET，SEM，PSDA and XRD.Our findings showed that the specific surface area of cordierite carrier increased from 0.153 m²·g^-1 to 1.024 m²·g^-1 after acid etching， and the crystal structure of cordierite was not changed in the process of acidic etching. Compared with CuMnCeO_x/cordierite catalyst， more crystal peaks of active components were observed on the surface of CuMnCeO_x/acid-etched cordierite catalyst. Under reaction conditions of gas flow 0.12 m³·h^-1， toluene initial concentration 1000 mg·m^-3 and bed temperature 160 ℃， the removal efficiency of toluene by CuMnCeO_x/acid-etched cordierite catalyst was about 90%， which was higher 10% than that by CuMnCeO_x/cordierite catalyst. Simultaneously， the mineralization rate of toluene also increased from 78% to 82%. The removal rate of toluene was kept at 85%~95% during five recycles test of total 600 minutes that confirmed the high activity and good stability of CuMnCeO_x/acid-etched cordierite catalyst. This study lays down a theoretical base for the preparation of highly active catalyst and its application in microwave catalytic combustion of real VOCs waste gas.

• Key words：acidic treatment  cordierite  microwave catalytic combustion  toluene  characterization

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