Effect of MnOx on Pt/CeZrO2 catalyzed CO oxidation under water vapor and CO2 conditions

ZHU Li; DENG Yun; SONG Yupeng; WANG Yuejuan; LU Jiqing; LUO Mengfei

doi:10.11949/j.issn.0438-1157.20170942

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Effect of MnO_x on Pt/CeZrO₂ catalyzed CO oxidation under water vapor and CO₂ conditions

更新时间：2025-12-10

- Effect of MnO_x on Pt/CeZrO₂ catalyzed CO oxidation under water vapor and CO₂ conditions
- CIESC Journal Issue 4, Pages: 1484-1492(2018)
- 作者机构：
  
  1. 浙江师范大学物理化学研究所,浙江,金华,321004
  2. 金华职业技术学院化工与制药学院,浙江,金华,321017
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170942
  CLC： 643.3
- Online First：05 April 2018，
  
  Published：05 April 2018
- 稿件说明：
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ZHU Li, DENG Yun, SONG Yupeng, et al. Effect of MnO_x on Pt/CeZrO₂ catalyzed CO oxidation under water vapor and CO₂ conditions[J]. CIESC Journal, 2018, (4): 1484-1492. DOI: 10.11949/j.issn.0438-1157.20170942.
DOI：

ZHU Li, DENG Yun, SONG Yupeng, et al. Effect of MnO_x on Pt/CeZrO₂ catalyzed CO oxidation under water vapor and CO₂ conditions[J]. CIESC Journal, 2018, (4): 1484-1492. DOI: 10.11949/j.issn.0438-1157.20170942. DOI：

摘要

以CeZrO2固溶体为载体，发现MnOx的添加能促进Pt/CeZrO2催化剂的CO氧化性能，并研究了MnOx含量对催化剂CO氧化活性及抗H2O和CO2性能的影响。结果表明，随着MnOx含量增加，催化剂活性呈现先升高后降低的趋势，在MnOx含量为0.5%（质量分数）时活性最佳。MnOx的添加降低了Pt颗粒尺寸并影响催化剂还原性能从而促进反应活性。水汽和CO2对Pt/CeZrO2催化剂的CO氧化活性有抑制作用，而MnOx的加入能显著提高催化剂的抗水汽和CO2的能力。反应动力学结果表明，在Pt/CeZrO2催化剂上，反应气中引入H2O和CO2后，CO的反应级数有明显升高，说明H2O和CO2在催化剂表面与CO竞争吸附，导致CO反应活性下降；而在Pt/MnOx/CeZrO2催化剂上，CO的反应级数略有升高，说明MnOx的添加能有效抑制H2O和CO2与CO的竞争吸附，从而改善了催化剂的抗H2O和CO2性能。

Abstract

Adding MnOx to CeZrO2 solid solution carrier could effectively enhance Pt/CeZrO2 catalyst activity for CO oxidation. The effect of the amount of MnOx on catalytic activity and resistance of H2O and CO2 was studied. The results showed that the activity of Pt/MnOx/CeZrO2 catalyst was first increased and then decreased as MnOx content was increased with a maximum activity at 0.5% (mass) MnOx content. The addition of MnOx improved catalyst activity by reducing Pt particle size and changing catalyst reducibility. The presence of H2O vapor and CO2 in feed gas suppressed activity of Pt/CeZrO2 catalyst

which was effectively alleviated by MnOx in the catalyst. Kinetic study revealed that CO reaction order was considerably increased with presence of H2O and CO2for the Pt/CeZrO2 catalyst. Such a decline of catalyst activity might be due to competitive adsorption of H2O and CO2 over CO on catalyst surface. In contrast

the CO reaction order was slightly increased with presence of H2O and CO2 for Pt/0.5MnOx/CeZrO2 catalyst

implying that addition of MnOx could suppress competitive adsorption of H2O and CO2 over CO on catalyst surface and hence improve resistance to H2O and CO2.

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