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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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制备方法对Pd-MnOx/γ-Al2O3催化剂分解地表O3性能的影响
DOI: 10.1016/S1872-2067(14)60176-5, PP. 1883-1891
Keywords: 锰氧化物,钯,臭氧,催化分解,制备方法
Abstract:
？分别用溶胶凝胶法和分步沉淀法制备了MnOx+γ-Al2O3和MnOx/γ-Al2O3,用等体积浸渍法将等量的Pd(NO3)2分别浸渍于其上,再将它们分别涂覆于堇青石上,得到不同物理化学性质的整体式催化剂,并采用X射线衍射、X射线光电子能谱、程序升温还原和低温N2吸附-脱附等技术对催化剂进行表征.结果表明,制备方法和MnOx焙烧温度明显影响催化剂中MnOx的物相、表面Mn物种和表面活性氧物种的分布及织构性质.活性测试结果表明,两种制备方法得到的催化剂于16-90℃,380000-580000h-1条件下均可将0.6μL·L-1O3完全分解;尤其是溶胶凝胶法制备的Pd/γ-Al2O3+MnOx/γ-Al2O3催化剂分解O3活性较好,催化剂表面Mn2+:Mn3+:Mn4+=1.7:1:3(mol).
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