Journal of the Japan Petroleum Institute
Online ISSN : 1349-273X
Print ISSN : 1346-8804
ISSN-L : 1346-8804
Regular Paper
Synthesis of Solid Base Catalyst of BaO–Al2O3 Binary Oxide by Solid-liquid Interface Reaction of Hydrated Barium Hydroxide with Aluminum Alkoxide
Hiromi MATSUHASHIKohki SATOSayaka MISUKana YOSHIDA
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2020 Volume 63 Issue 1 Pages 20-27

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Abstract

Solid base BaO–Al2O3 catalyst was synthesized using the solid-liquid interface reaction of Ba(OH)2 · H2O in the solid phase with Al(OCH(CH3)2)3 dissolved in ethyl acetate. Water of crystallization in the barium hydroxide, Ba(OH)2 · H2O was consumed by hydrolysis of Al(OCH(CH3)2)3 into Al2O3 and isopropanols. BaO–Al2O3 catalyst synthesized by solid-liquid interface reaction of Ba(OH)2 · H2O with equal mols of Al(OCH(CH3)2)3 and heat-treated at 673 K showed the highest activity among the prepared catalysts for the retro-aldol reaction of diacetone alcohol. Active BaO–Al2O3 catalysts with various contents of BaO were obtained by heating at appropriate temperatures just below those of Ba5Al2O8 and BaAl2O4 crystallization. X-ray diffraction analysis detected no BaO phase in this solid base catalyst. Barium oxide highly dispersed in amorphous Al2O3 was prepared by the solid-liquid interface reaction. The interface reaction of metal hydroxide in the solid phase with alkoxide in the liquid phase is useful to form well-dispersed mixed metal oxides.

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