engleski

Analysis and modelling of monolithic reactor

This work reports the results of experimental and theoretical investigation of NO decomposition in the catalytic monolith reactor. Monolithic catalysts are composed of commercial cordierite substrate (Corning Inc.) and copper containing ZSM-5 zeolite (Si/Al=40 ; 1.92 % Cu). Laboratory scale activity tests were carried out in the integral monolith reactor, operating under atmospheric pressure at different temperatures (573-773 K) and at various space times. The reactor performance was modelled using several mathematical models. The complexity of the models varied from the simple one-dimensional (1D) to more complex two-dimensional (2D) heterogeneous models, which incorporate the full range of fundamental physical phenomena occurring in the monolith channels. Kinetics of NO decomposition was described by LHHW type of rate equation. The parameters of the monolith reactor models were estimated from experimental data using a modified differential method and Nelder-Mead method of non-linear optimization. Correlation criterion was a mean square deviation between the experimentally obtained and theoretically predicted values. It was found out that behaviour of the experimental monolithic reactor was mainly limited by interphase mass transfer. The 2D heterogeneous model with distributed parameters was pointed out as the most suitable mathematical model for detailed consideration of physico-chemical processes occurring in the catalytic monolith reactor.

monolith reactor; Cu/ZSM-5 zeolit; Washcoat; mathematical models

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