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采用柠檬酸溶胶-凝胶法制备CeO2基固溶体催化剂(Ce0.7Zr0.3O2-!、Ce0.7Pr0.3O2-!和Ce0.7Gd0.3O2-!),并考察了固溶体和三种常用载体(TiO2、SiO2和Al2O3)及其负载KNO3后的催化碳黑燃烧活性.结果表明,CeO2基固溶体催化剂具有很高的催化燃烧活性,其活性接近TiO2、SiO2和Al2O3负载30%KNO3催化剂的活性.因为纳米CeO2基固溶体的形成,提高了催化剂的抗烧结能力,使氧更活泼,从而提高氧化还原性能,有利于碳颗粒燃烧.由于CeO2基固溶体本身的高活性,因此KNO3的添加不能明显提高CeO2基固溶体催化剂(尤其是Ce0.7Zr0.3O2-!和Ce0.7Pr0.3O2-!)的催化燃烧活性,但KNO3能显著提高TiO2,SiO2和Al2O3的催化燃烧活性.
The CeO2-based solid solution catalysts (Ce0.7Zr0.3O2 - !, Ce0.7Pr0.3O2-! And Ce0.7Gd0.3O2-!) Were prepared by the citric acid sol-gel method. The effects of solid solution and three common supports , SiO2 and Al2O3) and their catalytic combustion activity after KNO3 loading.The results show that CeO2-based solid solution catalyst has a high catalytic combustion activity and its activity is close to that of TiO2, SiO2 and Al2O3 loaded with 30% KNO3 catalyst. The formation of CeO2-based solid solution improves the anti-sintering ability of the catalyst and makes the oxygen more active, thereby improving the redox performance and the combustion of the carbon particles. Due to the high activity of the CeO2-based solid solution itself, the addition of KNO3 can not obviously improve the CeO2-based solid solution Catalysts, especially Ce0.7Zr0.3O2-! And Ce0.7Pr0.3O2- !, but KNO3 can significantly improve the catalytic combustion activity of TiO2, SiO2 and Al2O3.