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负载一种含锰复合催化剂的蜂窝陶瓷催化降解VOCs中的乙酸乙酯

Catalytic Degradation of Ethyl Acetate in VOCs by Honeycomb Ceramics Loaded with A Manganese-containing Composite Catalyst

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【作者】 李利霞王芳蔡海军

【Author】 LI Lixia;WANG Fang;CAI Haijun;Henan Jiyuan ecological environment monitoring center;

【机构】 河南省济源生态环境监测中心

【摘要】 通过洗涂法成功将La修饰的Cu-Mn尖晶石氧化物涂覆于蜂窝陶瓷上,并将其用于乙酸乙酯的催化分解。通过X射线衍射、X射线荧光、H2程序升温还原、Brunauer-Emmett-Teller(BET)法、场发射扫描电镜对La修饰的Cu-Mn氧化物进行了表征。此外,研究了不同沉淀剂和稀土掺杂对催化剂结构和催化性能的影响。结果表明,以(NH42CO3为沉淀剂的CuMn2O4尖晶石可以形成较大的比表面积和合适的孔径,有利于乙酸乙酯的吸附,而稀土掺杂虽然没有明显改变催化剂的晶相结构,但其提高了催化剂的还原性并降低了催化分解的温度。对于乙酸乙酯的催化分解,在239℃、12 500 h-1的空速和1 000×10-6 mol/cm3的条件下,负载在蜂窝陶瓷上的稀土改性Cu-Mn氧化物显示出优异的催化性能,可使乙酸乙酯的转化率达到100%,且在连续反应1 440 min后,乙酸乙酯的去除率仍为100%。

【Abstract】 La-modified Cu-Mn spinel oxides were successfully coated on honeycomb ceramics by washcoating method and used for the catalytic decomposition of ethyl acetate. The La-modified Cu-Mn oxides were characterized by X-ray diffraction, X-ray fluorescence, H2 temperature-programmed reduction, Brunauer-Emmett-Teller(BET) method and field emission scanning electron microscopy. In addition, the effects of different precipitants and rare earth doping on the catalyst structure and catalytic performance were investigated. The results show that the CuMn2O4 spinel with(NH42CO3 as the precipitant can form a larger specific surface area and suitable pore size, which is beneficial to the adsorption of ethyl acetate. Although the rare earth doping does not significantly change the crystal phase structure of the catalyst, it improves the reducibility of the catalyst and lowers the temperature of catalytic decomposition. For the catalytic decomposition of ethyl acetate, rare earth-modified Cu-Mn oxides supported on honeycomb ceramics showed excellent catalytic performance at 239 ℃, a space velocity of 12 500 h-1 and 1 000×10-6 mol/cm3, which can make acetic acid The conversion rate of ethyl ester reached 100%. The removal rate of ethyl acetate was still 100% after 1 440 min of continuous reaction.

  • 【文献出处】 中国锰业 ,China Manganese Industry , 编辑部邮箱 ,2022年03期
  • 【分类号】X701;O643.36
  • 【下载频次】4
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