A Ce‐Nb‐(Al) Oxide Porous Glass‐Ceramic

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Abstract
Substitution of the end‐member oxides in the ternary sodium borosilicate system diagram was studied. Replacing SiO2 in this ternary system with a combination of CeO2 and Nb2O5 was found to produce glasses which, after heat treatment, decomposed into two immiscible microphases of which one is water‐soluble. The mode of phase decomposition is sensitive to impurities. The importance of crucible selection, e.g. Al2O3 or Pt/Rh, is demonstrated by differences in pore size, surface area, heat resistance, and structure of the insoluble phase for a series of Ce2O3‐Nb2O5 and Ce2O3−Nb2O5−Al2O3 glass‐ceramics. These new materials have a specific surface area of up to 217 m2/g and a pore radius of between 1.1 and 54.5 nm.

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