Journal of the Ceramic Society of Japan, Supplement
Online ISSN : 1349-2756
ISSN-L : 1349-2756
Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue
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Effect of Ethanol Concentration on the Phase Evolution of Ag/γ-Al2O3 During Solvothermal Process
Qing TANGRuixing LIShu YINTsugio SATO
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Solvothermal treatment of AgNO3 in alcohol-water mixed solvent dispersed with γ-alumina (γ-Al2O3) powders at 498 K for 2 h was conducted to prepare Ag/(γ-Al2O3) composite powders for catalysts. The influence of ethanol content on the crystalline phase and microstructure of solvothermal products was investigated. With decreasing ethanol content in the solvent, the alumina matrix phase gradually changes from γ-Al2O3 to boehmite (γ-AlOOH), accordingly, the ratio of larger rhombic γ-AlOOH to smaller needle-like γ-Al2O3 increased. This phase change resulted in the decrease of the BET specific surface area and total pore volume and a shift of the characteristic pore size and pore size distribution. During the solvothermal treatment in ethanol/water mixed solvents, silver nanoparticles precipitated from the solution to form Ag/(γ-AlOOH, γ-Al2O3) nano-composites whereas no precipitation occurred in pure water.

© 2004 The Ceramic Society of Japan
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