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以γ-Al2 O3 为第一载体 ,Mg O为修饰物 ,在修饰过程中加入络合剂聚乙烯醇 ( PVA)制备复合载体 ,以稀土复合氧化物 La0 .8Sr0 .2 Co O3 为活性组分 ,采用浸渍蒸干法得到负载型催化剂 ,用 XRD、BET法、二甲苯完全氧化等手段 ,测定了复合载体及催化剂的相关性能 .结果表明 :加入 PVA可有效减小复合载体的晶粒至纳米量级 ,提高其比表面积 ,降低修饰物 Mg O的用量 ,其相应催化剂的活性也得到改善 .
With γ-Al 2 O 3 as the first carrier and MgO as the modifier, a complexing agent, polyvinyl alcohol (PVA), was added during the modification process to prepare a composite carrier. The rare earth composite oxide La0.8Sr0.2CoO3 was used as an active component , The supported catalyst was obtained by impregnation and steaming, and the relative performance of the composite carrier and the catalyst was determined by means of XRD, BET method and complete oxidation of xylene.The results showed that the addition of PVA could effectively reduce the grain- Order to increase its specific surface area, reduce the amount of modified MgO, the corresponding catalyst activity is also improved.