Effect of Ag loading on soot oxidation for Ag/Ce0.75Zr0.25O2 catalysts

DENG Xiangling; YE Songshou; CAO Zhikai; ZHANG Nuowei; ZHENG Jinbao; CHEN Binghui

doi:10.11949/j.issn.0438-1157.20161683

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Effect of Ag loading on soot oxidation for Ag/Ce_0.75Zr_0.25O₂ catalysts

更新时间：2025-12-10

- Effect of Ag loading on soot oxidation for Ag/Ce_0.75Zr_0.25O₂ catalysts
- CIESC Journal Issue 8, Pages: 3064-3070(2017)
- 作者机构：
  
  厦门大学化学工程与生物工程系, 醇醚酯化工清洁生产国家工程实验室, 能源材料化学协同创新中心,福建,厦门,361005
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20161683
  CLC： 643.36
- Online First：05 August 2017，
  
  Published：05 August 2017
- 稿件说明：
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DENG Xiangling, YE Songshou, CAO Zhikai, et al. Effect of Ag loading on soot oxidation for Ag/Ce_0.75Zr_0.25O₂ catalysts[J]. CIESC Journal, 2017, (8): 3064-3070. DOI: 10.11949/j.issn.0438-1157.20161683.
DOI：

DENG Xiangling, YE Songshou, CAO Zhikai, et al. Effect of Ag loading on soot oxidation for Ag/Ce_0.75Zr_0.25O₂ catalysts[J]. CIESC Journal, 2017, (8): 3064-3070. DOI: 10.11949/j.issn.0438-1157.20161683. DOI：

摘要

开发低温下高催化活性的柴油机碳烟颗粒燃烧催化剂是当前环境催化领域的热点问题。利用共沉淀的方法制备了用于碳烟催化燃烧反应的Ag/Ce0.75Zr0.25O2催化剂。活性评价结果表明，相对于Ce0.75Zr0.25O2催化剂，Ag的引入可显著降低碳烟催化燃烧温度。而且，Ag的负载量存在一个最佳值。以XRD、in-situ XRD、BET、TPR等表征手段探究了该系列催化剂结构性质及其变化产生的影响。结果表明，Ag与Ce物种间的相互作用可显著降低催化剂（特别是CeO2表面氧）的还原温度。该相互作用使Ag/Ce0.75Zr0.25O2催化剂在一定温度下（>200℃）就表现出Ag+的性质。这些性质与该催化剂具有较高的碳烟氧化活性相关。而且，该催化剂也表现出良好的稳定性。

Abstract

It is still important to develop soot oxidation catalysts with excellent activity under low temperature. Ag/Ce0.75Zr0.25O2 was synthesized via coprecipitation method for soot oxidation. Compared with the catalytic performance of Ce0.75Zr0.25O2

the introduction of Ag can lead to the decrease of soot-ignition temperature. Moreover

there is an optimal Ag loading. Subsequently

several methods such as XRD

in-situ XRD

BET

TPR were used to characterize the physicochemical properties of Ag-based catalysts. The results showed that the introduction of Ag resulted in decreasing the reduction temperature of surface oxygen species

being due to the interaction of Ag and Ce. The interaction also brings about the occurrence of Ag+ nature. And the feature is linked with the outstanding activity of soot oxidation for Ag-based catalyst. Furthermore

the Ag-based catalyst possessed fairly good stability in soot oxidation.

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