Mechanism and kinetics of NO oxidation over Pt/γ-Al<sub>2</sub>O<sub>3</sub> catalyst

ZHAO Yingxian; WEI Feng; ZHANG Yanhui; YU Ying

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Mechanism and kinetics of NO oxidation over Pt/γ-Al₂O₃ catalyst

更新时间：2025-12-10

- Mechanism and kinetics of NO oxidation over Pt/γ-Al₂O₃ catalyst
- CIESC Journal Issue 5, Pages: 1156-1164(2008)
- 作者机构：
  
  浙江大学宁波理工学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：05 May 2008，
  
  Published：05 May 2008
- 稿件说明：
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ZHAO Yingxian, WEI Feng, ZHANG Yanhui, et al. Mechanism and kinetics of NO oxidation over Pt/γ-Al₂O₃ catalyst[J]. CIESC Journal, 2008, (5): 1156-1164.
DOI：

ZHAO Yingxian, WEI Feng, ZHANG Yanhui, et al. Mechanism and kinetics of NO oxidation over Pt/γ-Al₂O₃ catalyst[J]. CIESC Journal, 2008, (5): 1156-1164. DOI：

摘要

用连续流动管式反应器考察了在空时为0.090～0.720 s、NO进口浓度为0.03%～0.2%(体积分数)、O2浓度为2%～10%(体积分数)和温度为473～573 K条件下，NO在Pt/γ-Al2O3上的催化氧化反应。结果表明：在空速为5000 h-1、NO进口浓度为0.05%和O2浓度为5%条件下，当反应温度从473 K依次升高到523 K和573 K时，NO催化氧化反应的定态转化率从22.4%提高到45.5%和74.3%。NO定态转化率随空时或O2浓度的增加而增加，但基本与NO的进口浓度无关。基于实验结果和反应动力学理论，提出了含有6对12个正、逆向基元反应的机理，进而确立了以气相NO与解离吸附在催化剂表面的O之间的反应为控制步骤的NO催化氧化总反应速率模型，以其拟合动力学实验数据，确定了动力学参数，得到反应的活化能为80.01 kJ·mol-1。

Abstract

Catalytic oxidation of NO with O2 over Pt/γ-Al2O3 was carried out in a tubular reactor with varying space time(0.090—0.720 s)

inlet NO concentration (0.03%—0.2%

vol)

O2 concentration (2%—10%

vol) and at 473—573 K.At 5000 h-1 space velocity

0.05% inlet NO concentration and 5% O2 concentration

the steady-state conversion of NO oxidation increased from 22.4% to 45.5% and 74.3% with temperature increasing from 473 K to 523 K and 573 K.Based on the experimental observations

a mechanism consisting of 12 elementary reactions was proposed

and the kinetic model with the reaction between gaseous NO and dissociately adsorbed O as the rate-limiting step was established and well fitted the experimental data.From the kinetic model

the activation energy of reaction was determined to be 80.01 kJ·mol-1.

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Mechanism and kinetics of NO oxidation over Pt/γ-Al2O3 catalyst

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摘要

Abstract

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references

Mechanism and kinetics of NO oxidation over Pt/γ-Al₂O₃ catalyst