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Rapid and Continuous Hydrothermal Synthesis of Boehmite Particles in Subcritical and Supercritical Water
Author(s) -
Adschiri Tadafumi,
Kanazawa Katsuhito,
Arai Kunio
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb05625.x
Subject(s) - supercritical fluid , boehmite , hydrothermal circulation , aqueous solution , hydrothermal synthesis , chemical engineering , particle size , materials science , particle (ecology) , metal , morphology (biology) , mineralogy , chemistry , metallurgy , organic chemistry , aluminium , geology , paleontology , oceanography , engineering
Hydrothermal synthesis of AlOOH particles from an Al(NO 3 ) 3 aqueous solution was examined in subcritical and supercritical water. Continuous and rapid production of AlOOH fine particles was achieved by mixing a metal salt aqueous solution with preheated water fed from another line. The effects of temperature, pressure, and initial concentration of solution on the particle size, morphology, and crystal structure of the metal (hydrous) oxides were examined. These properties are strongly affected by slight changes in pressure and temperature. This strong effect is attributed to the large changes in the properties of water near its critical point resulting from the slight changes in pressure and temperature. The results suggest the simultaneous control of size, crystal structure, and morphology of the particles by hydrothermal synthesis in supercritical water.