engleski

Direct decomposition of NO in a monolith reactor: comparison of mathematical models

Monolith catalysts and reactors belong to the spatially structured systems. They appear to be one of the most significant and promising developments in the field of heterogeneous catalysis and chemical engineering of the recent years. Nowadays, they have found numerous applications, such as cleaning of automotive exhaust gases, selective catalytic reduction of nitrogen oxides (NOx) generated from the stationary sources and catalytic abatement of volative organic compounds (VOC) from industrial processes. The paper is concerned with experimental and theoretical study of NO decomposition in a catalytic monolith reactor. The reaction is performed in the temperature range of 573-773 K, under atmospheric pressure and at various space times. Zeolite-based monoliths are prepared using commercial cordierite and copper containing ZSM-5 zeolite (Si/Al = 40 ; 1.92 wt % Cu). Kinetics of NO decomposition is described by Langmuir-Hinshelwood type of rate equation. Several heterogeneous models are applied to describe a single channel of the monolith reactor. The proposed models are verified by comparing experimental data with theoretical predictions. For the assessment of the model adequacy comparison between mass transfer coefficients obtained using a model with a 1D description of the gas phase and 2D description of the solid phase and a complete 2D model is made and discussed. Particular emphasis is put on justifying suitability of such reactor models in the real conditions, especially with regards to knowledge of the appropriate parameters of the reactor model.

monolith reactor; mass transfer; mathematical modeling; NO decomposition

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