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- W2077897309 abstract "Abstract The aging of supported metal crystallites is caused, under certain conditions, by the diffusion of the crystallites upon the surface of the substrate and by the sintering of the colliding particles. If the size of a crystallite is of the order of magnitude of the diameter of the pore, the diffusion of the crystallite will be impeded. A two-dimensional coagulation equation is formulated to describe the time dependence of the sizes of the population of crystallites into a porous substrate. Two models are used for the diffusion coefficient of the crystallites upon the substrate. In one of them, the diffusion coefficient is inversely proportional to the area of the interface between particle and substrate, even when diffusion is impeded. In the other, the diffusion coefficient is assumed to behave as in the first model for particle sizes smaller than the diameter of a pore but is taken to be zero when the sizes of the particle and pore become of the same order. On the basis of the proposed models information about the size distribution and the decay of the exposed surface area of the metal is obtained. A comparison between the unimpeded diffusion on a planar substrate and the impeded diffusion inside a porous substrate is presented." @default.
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- W2077897309 date "1975-06-01" @default.
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- W2077897309 title "Effect of the pore size on the aging of supported metals" @default.
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- W2077897309 doi "https://doi.org/10.1016/0021-9517(75)90178-5" @default.
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