The effect of synthesis method on the properties and catalytic performance of Pd/Ce0.5Zr0.5O2-Al2O3 three-way catalyst
The effect of synthesis method on the properties and catalytic performance of Pd/Ce0.5Zr0.5O2-Al2O3 three-way catalyst
复制标题
合成方法对Pd/Ce0.5Zr0.5O2-Al2O3三效催化剂性能及催化性能的影响
DOI：
10.1016/j.molcata.2014.06.032
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发表时间：
2014-11-15
影响因子：
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通讯作者：
Chen, Yaoqiang
中科院分区：
文献类型：
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作者：
Lan, Li;Chen, Shanhu;Chen, Yaoqiang
采用传统的共沉淀法、机械混合法和改进的共沉淀法制备了3种Ce0.5Zr0.O5（2）-Al 2 O3化合物，并采用湿浸渍法制备了相应的单钯三效催化剂。系统地考察了催化剂的织构、结构、形态、还原性能和催化性能的差异，以及催化剂的热老化行为。结果表明，Ce-0.5Zr0.5O2（CZ）与Al 2 O3的不同混合方式导致CZ与Al 2 O3之间的相互作用不同，从而不同程度地改变了负载型催化剂的织构、结构和还原性能，并在老化过程中引起了不同程度的原子重排。采用改进的共沉淀法制备的Ce0.5Zr0.5O2-Al 2 O3负载型催化剂老化前后差别最小，老化后具有良好的上级织构、结构和还原性能，提高了三效催化性能，C3 H8、CO和NO的起燃温度为327 ℃，分别为164 ℃和208 ℃，明显低于来自常规共沉淀法和机械混合路线的催化剂。(C)2014爱思唯尔有限公司版权所有。
Three Ce0.5Zr0.O-5(2)-Al2O3 compounds were prepared using conventional coprecipitation method, mechanical mixing technique and a novel modified coprecipitation route, afterwards the corresponding Pd-only three-way catalysts were obtained by wet-impregnation method. Differences in textural, structural, morphological, reduction properties and catalytic performance, together with the thermal aging behaviors of the catalysts were investigated systematically. The results revealed that different mixing strategies of Ce-0.5Zr0.5O2(CZ) and Al2O3 led to different interaction between CZ and Al2O3, thus modified the textural, structural and reduction properties of the supported catalysts to different extents, and brought about various atom rearrangements during the aging process. The catalyst supported on Ce0.5Zr0.5O2-Al2O3 obtained by the modified coprecipitation method displayed the least distinction before and after aging treatment, and it presented superior textural, structural and reduction properties after aging, which consequently resulted in enhanced three-way catalytic performance, the light-off temperatures of C3H8, CO and NO were 327 degrees C, 164 degrees C and 208 degrees C, respectively, obviously lower than those of the catalysts originated from the conventional coprecipitation method and mechanical mixing route. (C) 2014 Elsevier B.V. All rights reserved.