Abstract

The authors investigate the crystallization, pore structure, and catalytic and sorptive properties of a Raney electrocatalyst. Their approach is based on a diffusional model of the two metals--nickel and aluminium--used in the catalyst which describes the rate of hydrogen evolution during leaching as a function of the diffusion distance. Adsorption isotherms are constructed for partially leached specimens and the degree of aluminium loss is determined from the volume of hydrogen evolved. They apply the model to both surface and volume diffusion and find that, whereas the model accurately depicts leaching behavior of the catalyst, it is impossible to separately describe the two diffusion processes.

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