A porous membrane-like alumina (MA) tube was employed as a catalyst to improve the energy efficiency of the oxidative decomposition of low-concentrated toluene in air by periodic short-term plasma discharge. The raw MA tube prepared by anodizing an aluminum tube had a relatively small surface area and toluene adsorption capacity, but they were remarkably increased by silica coating. Introducing the silica-coated catalyst into the dielectric-barrier discharge plasma generated for 5 s every 1 min resulted in a 3.6-fold increase in the rate of the toluene decomposition in a closed-circulating reaction system, suggesting that the toluene molecules were condensed by adsorption onto the catalyst surface and then decomposed by plasma. The energy efficiency was 14 g kWh −1 , which was 9.3 times larger than that for the non-catalytic oxidation of toluene by continuous plasma irradiation. Palladium loading onto the catalyst slightly degraded the decomposition rate, but it suppressed the formation of organic by-products. These results clearly indicate the effectiveness of using a membrane-like catalyst in periodically-irradiated plasma reactors for VOC decompositions.

中文翻译：

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通过周期性短期等离子放电氧化分解空气中低浓度甲苯的管状膜状催化剂

采用多孔膜状氧化铝（MA）管作为催化剂，通过周期性短期等离子体放电提高空气中低浓度甲苯氧化分解的能量效率。通过对铝管进行阳极氧化制备的原始 MA 管具有相对较小的表面积和甲苯吸附能力，但通过二氧化硅涂层显着增加。将二氧化硅包覆的催化剂引入每 1 分钟产生 5 秒的介电势垒放电等离子体中导致封闭循环反应系统中甲苯分解速率增加 3.6 倍，表明甲苯分子通过吸附到催化剂表面，然后被等离子体分解。能效为 14 g kWh -1 ，即 9。比通过连续等离子体照射非催化氧化甲苯大 3 倍。钯负载到催化剂上会略微降低分解速度，但它抑制了有机副产物的形成。这些结果清楚地表明在周期性照射的等离子体反应器中使用膜状催化剂进行 VOC 分解的有效性。