Selectivity behaviour of non-uniform catalysts for the consecutive reactions A → B → C
TL;DR: In this paper, the effect of non-uniform catalytic activity distribution on product selectivity in consecutive reaction schemes A → B → C has been investigated for a single catalyst pellet and also for a fixed bed reactor containing nonuniform catalyst pellets.
About: This article is published in Chemical Engineering Journal.The article was published on 1991-06-01. It has received 2 citations till now. The article focuses on the topics: Catalysis & Selectivity.
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TL;DR: In this article , the analysis of consecutive irreversible reactions A→B→C in porous catalyst particles, where the simultaneous processes of diffusion and chemical reactions take place and both reactant and products are subjected to diffusion limitations, was performed for catalyst particles with non-uniform sizes.
Abstract: The analysis of consecutive reactions A→B→C in porous catalyst particles, where the simultaneous processes of diffusion and chemical reactions take place and both reactant and products are subjected to diffusion limitations, was performed for catalyst particles with non-uniform sizes, a fact that has not been considered so far. The system comprises first-order consecutive irreversible reactions that proceed on spherical catalyst particles with a log-normal volume particle size distribution (PSD), which is typical in many catalytic applications. Regardless of the prevailing diffusion regime (chemical control, transition situation or intraparticle diffusion control), the yield of the intermediate product (B) reaches a maximum value as a function of the conversion of reactant (A), then decreases as a consequence of the prevalence of the secondary reaction that converts it into the secondary product (C). If intraparticle diffusion resistances affect the reactant species, given the relationship between the kinetic constants and the mean particle size, the selectivity to the intermediate product is negatively affected by the dispersion in PSD. The larger the dispersion in PSD, the stronger the negative impact.
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TL;DR: In this article, the authors compared the uniform and non-uniform distribution of catalyst on porous supports with regard to: (1) the catalyst selectivity in a series reaction A → B → C, (2) the catalytic deactivation under a self-fouling reaction A→ B →C.
88 citations
TL;DR: In this paper, the influence of a non-uniform distribution of the intrinsic catalytic activity of a single spherical pellet on its effectiveness factor, selectivity and deactivation was investigated.
83 citations
TL;DR: In this paper, the bimolecular Lagmuir kinetics under isothermal conditions, such as the oxidation of carbon monoxide over platinum, were computed and compared for four catalysts: active ingredient deposited in an interior layer, in a middle layer, and in an exterior layer, uniformly in the entire support.
72 citations
TL;DR: In this paper, the same quantity of active material, deposited in different manners on supports and subjected to a period of poison deposition, are compared in their durabilities towards poisoning, and a criterion for catalyst selection is given, based on durability and efficiency.
69 citations