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COMPARING PERFORMANCE OF STRUCTURED AND UNSTRUCTURED CATALYSTS IN DRY REFORMING OF METHANE
Abstract
This study has its aim to compare the performance of modern structured and unstructured catalysts in a dry reforming of methane (DRM). DRM is used to obtain a mixture of H2 and CO with almost equal fractions of both products, which is subsequently used in synthesis of some chemical valuable products. The kinetic scheme for tungsten carbide (WC) catalyst was taken from the literature. Using the experimental data for a fixed bed catalyst, we have fitted the parameters of the kinetic scheme of DRM on WC catalyst. The reaction rates in our model are calculated using the microkinetic approach, the format used allows for direct incorporation of the model into CFD (computational fluid dynamics) calculation. The kinetic model obtained was used to simulate the DRM in a foam reactor using the CFD approach. We compare the results with the experimental conversion data for the membrane reactor and the fixed bed catalytic reactor. This comparison is based on the equal linear velocity and the equal catalyst mass. Under the conditions studied, the foam catalyst does not show any gain obtained due to complex structure and flow distribution. We explain why the membrane reactor should be preferred to other types of catalytic reactors being considered.
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