VOCs催化燃烧催化剂Mn/γ-Al2O3和CuMn/γ-Al2O3的性能研究

用浸渍法制备了两种负载型的Mn/g -Al2O3和Cu-Mn/g-Al2O3复合氧化物催化剂,同时用共沉淀法制备了Cu-Mn-O复合氧化物催化剂。以气相色谱为检测手段,用常压气体流动评价装置考察了这三种催化剂对苯、甲苯、二甲苯等挥发性有机化合物VOCs的催化燃烧性能。发现负载型的催化剂转化率达到99%时的反应温度比非负载型的降低30~40C,其中Cu-Mn/g-Al2O3催化剂具有更好的低温活性,催化燃烧反应的速率明显提高。负载型催化剂表面的活性组分以高度分散状态存在和催化剂高的比表面积是性能好的主要原因。

Catalytic Combustion of Volatile Organic Compounds on Mn/γ-Al2O3 and CuMn/γ-Al2O3 Catalysts

Mn/g -Al2O3 and CuMn/g -Al2O3 supported catalysts and a Cu-Mn complex oxide catalyst were prepared by impregnation and coprecipitation, respectively. Their reactivity in the catalytic combustion of volatile organic compounds (benzene, toluene and xylene) was tested with the aid of Gas Phase Chromatograph. It was found that two supported catalysts had a higher activity and the reaction rate of the catalytic combustion in low temperature increased obviously. The reaction temperature of supported catalysts at which the conversion achieved 99% was lower than that of the non-supported catalyst by 30 to 40C. It appears reasonable to suggest that the dispersion of active particles and their high specific surface area play a key role in the catalytic combustion of volatile organic compounds.