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采用不同方法制备了铈锆复合氧化物催化剂用于催化HCl氧化反应。自发沉积策略制备的CeO_2@ZrO_2催化剂中,超细CeO_2纳米粒子均匀的镶嵌于非晶态ZrO_2中。CeO_2粒子显著的“尺寸效应”使得该催化剂具有更高的Ce~(3+)和氧空位浓度,而较高的Ce~(3+)和氧空位浓度使得催化剂具有优异的低温氧化还原性能和储释氧能力。催化性能测试表明,CeO_2@ZrO_2催化剂展现出最好的催化活性(1.90 gCl2·gcat~(-1)·h~(-1)),同时CeO_2粒子周围非晶态的ZrO_2阻碍CeO_2的高温烧结,提高了该催化剂的稳定性。
Different methods were used to prepare cerium-zirconium composite oxide catalysts for the catalytic oxidation of HCl. In the CeO_2 @ ZrO_2 catalyst prepared by spontaneous deposition strategy, ultrafine CeO_2 nanoparticles are uniformly embedded in amorphous ZrO_2. The significant “size effect” of CeO 2 particles makes the catalyst have higher Ce 3+ and oxygen vacancy concentration, while higher Ce 3+ and oxygen vacancy concentration make the catalyst have excellent low temperature redox Performance and oxygen storage capacity. The catalytic performance tests showed that the CeO_2 @ ZrO_2 catalyst exhibited the best catalytic activity (1.90 gCl 2 · gcat -1 · h -1) and the amorphous ZrO_2 around CeO_2 particles hindered the high temperature sintering of CeO_2, Improve the stability of the catalyst.