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以金属硝酸盐为原料,分别采用高分子前驱体法、柠檬酸盐凝胶法制备了纳米级的Ce-Zr-Ba-O复合氧化物超细粒子,采用X-射线衍射(XRD)、透射电镜(TEM)、BET比表面测定、热重-差热(TG-DTA)技术对催化剂进行了表征,并考察了催化剂的CO氧化活性和热稳定性。实验结果表明,高分子前驱体法和柠檬酸盐凝胶法制备的催化剂粉体都达到了纳米级。两种方法中,高分子前驱体法所制得的催化剂的BET比表面达118.96m2·g-1,CO氧化反应活性较高,同时该方法制得的催化剂分散性好,无团聚,经1000℃高温焙烧后仍基本无烧结、无团聚现象,具有较高的热稳定性。
Nanometer-size Ce-Zr-Ba-O composite oxide ultrafine particles were prepared by metal nitrate and citrate gel method using XRD, The catalysts were characterized by transmission electron microscopy (TEM), BET specific surface measurement and TG-DTA. The CO oxidation and thermal stability of the catalysts were also investigated. The experimental results show that both the polymer precursor and the citrate gel prepared catalyst powders have reached the nano-scale. In the two methods, the BET specific surface of the catalyst prepared by the method of the polymer precursor is 118.96m2 · g-1, the CO oxidation reaction activity is high, and the catalyst prepared by the method has good dispersibility and no agglomeration, High temperature baking is still basically no sintering, no reunion, with high thermal stability.