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SPONTANEOUS DISPERSION OF SOME ACTIVE COMPONENTS ONTO THE SURFACES OF CARRIERS

谢有畅  杨乃芳  刘英骏  唐有祺  
【摘要】: <正> If an ionic or molecular crystalline solid is mixed with a carrier of high specific surface and then heated at a suitable temperature below its melting point for several hours, the crystalline solid will disperse spontaneously onto the surface of the carrier. It has been proved by the fact that the X-ray diffraction peaks of the crystalline phase either diminish sharply or disappear completely according as whether the amount of the solid mixed with each unit weight of carrier exceeds the critical amount or not and this critical amount of solid is closely related to and usually varies directly as the specific surface of the carrier.If the active component of a catalyst is a compound instead of a metal, and its quantity is not enough to cover the surface of the carrier, it often disperses somewhat as a monolayer, because the ions or molecules of the active component combine strongly with the surface ions or groups of the carrier. This paper presents some fundamental points and methods of investigation in

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