NO在Pt/γ-Al2O3上催化氧化反应机理和动力学

被引：11

作者：

赵迎宪

危凤

张艳辉

虞影

机构：

[1] 浙江大学宁波理工学院

来源：

化工学报 | 2008年 / 05期

关键词：

一氧化氮; 催化氧化; 负载型铂催化剂; 动力学;

D O I：

暂无

中图分类号：

O643.32 [催化反应];

学科分类号：

摘要：

用连续流动管式反应器考察了在空时为0.090～0.720s、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473～573K条件下,NO在Pt/γ-Al2O3上的催化氧化反应。结果表明:在空速为5000h-1、NO进口浓度为0.05%和O2浓度为5%条件下,当反应温度从473K依次升高到523K和573K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80.01kJ.mol-1。

引用

页码：1156 / 1164

页数：9

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