화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.58, 246-257, February, 2018
DOI10.1016/j.jiec.2017.09.034  Export Citation
Controllable synthesis of zone-distributed Pd over CeO2-ZrO2/Al2O3 as advanced three-way catalyst
Li Lan, Shanhu Chen1, †, Hongmei Li, Hanmei Li, Wanxia Wu, Jie Deng, and Yaoqiang Chen2, †
  • College of Pharmacy and Biological Engineering, Chengdu University, Chengdu 610106, China
  • 1Sinocat Environmental Technology Co., Ltd., Chengdu 611731, China
  • 2Key laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
E-mail:,
Two optimally designed catalysts (Ce0.7Zr0.3O2/Pd/Al2O3, Pd/Ce0.7Zr0.3O2/Pd/Al2O3) were synthesized and compared with conventional Pd/Ce0.7Zr0.3O2/Al2O3. The characterization results reveal that for Pd/Ce0.7Zr0.3O2/Al2O3, Pd species undergo severe agglomeration and encapsulation during thermal aging process, leading to dramatic catalyst deactivation. While for the two optimized catalysts, some Pd species initially distributed on Al2O3 would migrate to the surface of CexZr1-xO2(CZ) grains upon aging treatment, resulting in enhanced Pd-CZ interaction, thus the two aged samples possess higher dispersion, larger amount of oxidized Pd2+ species and more oxygen vacancies compared with conventional Pd/Ce0.7Zr0.3O2/Al2O3-a. Consequently, modified reducibility and improved three-way catalytic performance are obtained, especially for Pd/Ce0.7Zr0.3O2/Pd/Al2O3-a.
Keywords:Optimally designed catalysts;Pd-CZ interaction;Dispersion;Oxidation state;Three-way catalytic performance
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