α-MnO2/γ-Al2O3 and β-MnO2/γ-Al2O3 catalysts were prepared and characterized by XRD, TEM,TG and H2-TPR. The properties of the catalysts for degradation of acetaldehyde and benzene with non-thermal plasma were investigated. The results showed that MnO2/γ-Al2O3 catalyst could obviously improve the removal efficiency of VOCs and CO2 selectivity with non-thermal plasma, and α-MnO2/γ-Al2O3 was superior to β-MnO2/γ-Al2O3.When the input voltage of the non-thermal plasma was 16.8 kV, acetaldehyde removal efficiency of 100% over a-MnO2/-y-Al2O3 catalyst combined with non-thermal plasma was attained. Compared with acetaldehyde, benzene was more difficult to be removed because of its more stable chemical structure.%制备了α-MnO2/γ-Al2O3和β-MnO2/γ-Al2O3负载型锰系氧化物催化剂,通过XRD、TEM、TG和H2-TPR等手段对催化剂进行表征,分别考察催化剂与低温等离子体耦合协同去除乙醛和苯的效果.结果表明,MnO2/γ-Al2O3催化剂的加入明显提高低温等离子体去除挥发性有机物的效率及CO2选择性,α-MnO2/γ-Al2O3的耦合效果优于β-MnO2/γ-Al2O3.低温等离子体输入电压为16.8 kV,α-MnO2/γ-Al2O3与低温等离子体耦合乙醛去除率可达100％.降解苯的效率较低,这是由于苯的化学结构更稳定.
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