A new concept in high performance ceria–zirconia oxygen storage capacity material with Al2O3 as a diffusion barrier

材料科学 粒径 微晶 催化作用 化学工程 立方氧化锆 耐久性 粒子(生态学) 扩散 氧气储存 化学 复合材料 冶金 有机化学 陶瓷 热力学 工程类 地质学 物理 海洋学
作者
Akira Morikawa,Tadashi Suzuki,Takaaki Kanazawa,Koichi Kikuta,Akihiko Suda,Hirofumi Shinjo
出处
期刊:Applied Catalysis B-environmental [Elsevier BV]
卷期号:78 (3-4): 210-221 被引量:176
标识
DOI:10.1016/j.apcatb.2007.09.013
摘要

CeO2–ZrO2 solid solution ((Ce,Zr)O2) is an indispensable oxygen storage capacity (OSC) material for emission control in gasoline-fuelled automobiles. The high performance OSC material developed in this study is composed of Al2O3 as "a diffusion barrier" and (Ce,Zr)O2 particles in intervening layers on a nanometer scale, and is abbreviated as "ACZ". The Brunauer–Emmett–Teller (BET) specific surface area (SSA) of ACZ after durability testing in air at 1000 °C was 20 m2/g, which is higher than that of conventional CZ (2 m2/g) composed of (Ce,Zr)O2 without Al2O3. After heat treatment at 1000 °C in air, the particle size of (Ce,Zr)O2 in ACZ was about 10 nm and that without Al2O3 was one-half of the size in pure CZ. The OSC was roughly characterized by the total capacity (OSC-c1) and the oxygen release rate (OSC-r). In a fresh catalyst, ACZ and CZ had almost the same OSC-c1; however, the OSC-r of ACZ was twice as fast as CZ. After durability testing, the OSC-r of both ACZ and CZ were reduced significantly, but the OSC-r of ACZ was about five times as fast as CZ. While the OSC-c1 was hardly influenced by the (Ce,Zr)O2 crystallite size and Pt particle size on the supports, the OSC-r was influenced by both of these parameters. The improvement of the OSC-r in the fresh catalyst and inhibition of the decrease in the OSC-r after durability testing were achieved by suppression of particle growth of (Ce,Zr)O2 in ACZ by introducing Al2O3 as a diffusion barrier with resultant inhibition of sintering of Pt particles.
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