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一般认为La0.8Sr0.2MnO3和La0.8Sr0.2CoO3两种钙钛矿型复合氧化物是CO氧化、碳氢(HC)化合物完全氧化和NOx还原的良好氧化物催化剂.用复合硝酸盐溶液浸渍载体,制取此类负载型催化剂,负载量15%(质量分数).用二甲苯完全氧化反应作为“探针反应”,配合XRD分析、BET表面积测定,发现γ-Al2O3对La0.8Sr0.2MnO3是合适的载体;而对La0.8Sr0.2·CoO3则是不合适的,即使γ-Al2O3表面预先涂布了La2O3层,使催化活性有所改善,但仍不能作为一种理想的燃烧催化剂.
It is generally considered that two kinds of perovskite-type composite oxides La0.8Sr0.2MnO3 and La0.8Sr0.2CoO3 are good oxide catalysts for CO oxidation, complete oxidation of hydrocarbon (HC) compounds, and reduction of NOx. Impregnate the carrier with composite nitrate solution to prepare such a supported catalyst, loading 15% (mass fraction). Complete oxidation reaction of xylene as a “probe reaction”, with XRD analysis, BET surface area determination found that γ-Al2O3 La0.8Sr0.2MnO3 is a suitable carrier; and La0.8Sr0.2 · CoO3 is not suitable , Even though the γ-Al2O3 surface is pre-coated with La2O3 layer to improve the catalytic activity, it can not serve as an ideal combustion catalyst.