Modelling of the selective catalytic NO x reduction in diesel exhaust including ammonia storage
Modelling of the selective catalytic NO x reduction in diesel exhaust including ammonia storage
复制标题
柴油机尾气中选择性催化氮氧化物还原（包括氨储存）的建模
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
G. Koltsakis
中科院分区：
文献类型：
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作者：
D. Tsinoglou;G. Koltsakis
摘要建立了氨选择性催化还原柴油机尾气中NOx的数学模型。本文用已发表的数学模型对整体式催化转化器内的传热传质和流动现象进行了模拟。的化学现象所描述的氨的氧化和NOx的还原，使用Langmuir-Hinshelwood反应速率表达式的全球反应。氨存储现象被考虑在内，根据Dubinin和Radushkevich提出的吸附等温线。包括在数学模型和氨的吸附和解吸模型的稳态化学反应计划进行了验证，对以前发表在文献中的实验数据。研究了原料气中NH3/NOx比值振荡对氨存储现象的影响。结果表明，对于所研究的应用，氨存储在中间温度下起着重要的作用，其中转化率由反应动力学控制，只要氨吸附能力足够高。
Abstract A mathematical model for the simulation of the selective catalytic reduction of NO x by ammonia in diesel exhaust is presented. The simulation of heat and mass transfer, and flow phenomena in a monolithic catalytic converter is performed by a previously published mathematical model. The chemical phenomena are described by global reactions for the oxidation of ammonia and the reduction of NO x , using Langmuir-Hinshelwood reaction rate expressions. Ammonia storage phenomena are taken into account, based on the adsorption isotherm proposed by Dubinin and Radushkevich. Both the steady state chemical reaction scheme included in the mathematical model and the ammonia adsorption and desorption model are validated against experimental data previously published in the literature. The effect of ammonia storage phenomena under an oscillating NH3/NO x ratio in the feed gas is investigated. The results indicate that for the application examined, ammonia storage plays an important role at intermediate temperatures, where conversion is controlled by reaction kinetics, provided that the ammonia adsorption capacity is sufficiently high.