Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
Feature: The 55th Symposium on Basic Science of Ceramics: Full papers
Hybridization of Ni–Cr, Cu–Cr, and Zn–Cr layered double hydroxides with polyoxometalates and their catalytic behavior
Yuma MITANITakahiro TAKEISayaka YANAGIDANobuhiro KUMADA
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Volume 125 (2017) Issue 10 Pages 747-752

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Abstract

Cr-based layered double hydroxides (LDHs) containing Ni, Zn, or Cu as the divalent cation were prepared with a divalent-to-trivalent cation molar ratio of 3. Then, LDH hybrids intercalated with polyanions ([PMo12O40]3−(PMoO) or [H2W12O42]10− (HWO)) were prepared by ion exchange and hydrothermal processes. The shift of the diffraction line indicating interlayer space in the X-ray diffraction patterns confirmed the intercalation in the LDH. The fraction of PMoO and HWO anions incorporated was 30–70 or 60–90% of ion exchange capacity, respectively, by charge compensation for Cr3+. In the conversion of styrene by epoxidation and oxidation, the hybrid of the LDH composed of Zn and Cr with PMoO showed the maximum catalytic activity, with 70% conversion. For the LDH composed of Ni and Cr, hybridization with a polyanion enhanced the catalytic behavior by a synergistic effect resulting from the basicity of the LDH phase.

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© 2017 The Ceramic Society of Japan
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