Development of the Structured Catalysts for the Exhaust Gas Treatment
Development of the Structured Catalysts for the Exhaust Gas Treatment
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DOI：
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发表时间：
2001
影响因子：
1.5
通讯作者：
V. Tomašić;Z. Gomzi
中科院分区：
文献类型：
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作者：
V. Tomašić;Z. Gomzi
对整体式催化反应器中NO分解反应进行了实验和理论研究。详细介绍了以堇青石为惰性载体，含铜ZSM-5分子筛为催化剂涂层的整体式催化剂的制备。在573 K至773 K的温度范围内和在不同的流速下考察了反应。一维（1D）非均相模型被用来描述单通道的整体。该模型考虑了催化剂表面的化学反应和外部传质过程。根据文献中的相关性估算了传质系数。NO分解动力学可用Langmuir-Hinshelwood型速率方程描述。反应器模型进行了验证，通过比较实验数据与理论预测。总的来说，达成了良好的一致。然而，发现速率常数随着催化洗涂层厚度的增加而增加。因此，内部传质，甚至在催化洗涂层的非常薄的层内，也必须包括在用于整料通道的反应器模型中，以充分描述这种反应器系统的行为。
Experimental and theoretical investigation of NO decomposition in a catalytic monolith reactor has been performed. Preparation of the monolith catalyst, composed of cordierite substrate as an inert carrier and copper containing ZSM-5 zeolite as catalytic washcoat, is described in details. The reaction was examined in the temperature range from 573 K to 773 K and at different flow rates. One-dimensional (1D) heterogeneous model was applied to describe a single channel of the monolith. The model included the processes of external mass transfer and chemical reaction on the surface of the catalyst. Mass transfer coefficient was estimated from correlation available in the literature. Kinetics of NO decomposition was described by Langmuir-Hinshelwood type of rate equation. The reactor model was verified by comparing experimental data with theoretical predictions. Generally, good agreement has been achieved. However, the rate constant was found to increase with the increase in the thickness of the catalytic washcoat. Consequently, the internal mass transfer, even within a very thin layer of the catalytic washcoat, must also be included in the reactor model for the monolith channel to adequately describe behavior of such a reactor system.