Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
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Preparation of inorganic–organic composites as acid–base catalysts using HCa2Nb3−xTaxO10 and quaternary onium salts
Masataka OGASAWARATakuto BANKanji SAITOSumio KATO
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2020 Volume 128 Issue 1 Pages 51-55

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Abstract

Inorganic–organic composites have been prepared using Dion–Jacobson-type layered perovskite compounds as base catalysts. Dodecyltributylphosphonium bromide (C12TBPBr), dodecyltriphenylphosphonium bromide (C12TPPBr), or dodecyltrimethylammonium chloride (C12TMACl) were used as the organic species of the inorganic–organic composite. It was suggested that C12TBP+, C12TPP+, or C12TMA+ were intercalated by ion-exchange with interlayer H+ of HCa2Nb3O10. The acid–base reaction was evaluated by consecutive deacetalization–Knoevenagel reactions. The product of the second-step reaction of the inorganic–organic composite catalysts was obtained, which suggested that the composites were acid–base bifunctional materials. For composites prepared using HCa2Nb3−xTaxO10 (x = 1, 2, and 3) as inorganic species, the base catalytic activity decreased with decreasing fraction of organic species. Therefore, the hydrophobicity of the layered compounds affected the catalytic activity of the composite. Various catalysts should be prepared using reported layered perovskite-type compounds having various compositions.

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