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- W2011124555 abstract "Abstract In a previous paper it was shown that poisoning of a single crystal can reasonably be described assuming i) that the reaction site is an ensemble of free adjacent atoms, ii) the poison atoms form islands and the poisoning proceeds via a nucleation process and a subsequent isotropic growth. This paper presents an extension of this approach and considers the case of small particles. Using elementary statistics it is concluded that the variation of catalytic activity with the particle diameter D, the poison coverage θp, the density of poison islands β, the reactant coverage θr, and the size of the ensemble x, can be separated in a product of two terms. F = G(θr, D1, x). H(gqp, β, x) where G is the function already calculated in the absence of poison for small particles with D′ itself a function of D and of θp, and H the function valid on poisoned infinite surface. For particles larger than 16 nm, the variations of catalytic activity of powders parallels that of infinite surfaces. For smaller particles the poisoning is amplified by size effects. The model is compared with experimental data related to the poisoning of Ni by C and S in the methanation reaction. The physical significance of the aging order is proposed in the light of the model." @default.
- W2011124555 created "2016-06-24" @default.
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- W2011124555 date "1987-06-01" @default.
- W2011124555 modified "2023-09-30" @default.
- W2011124555 title "Poisoning of small metal particles by poison islands: A statistical approach based on the ensemble model" @default.
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- W2011124555 doi "https://doi.org/10.1016/s0166-9834(00)80693-4" @default.
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