Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Patent
1988-06-20
1990-03-27
Pal, Asok
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
502524, B01J 2102, B01J 2110
Patent
active
049120786
ABSTRACT:
Composite powders for spinels, MgO.nAl.sub.2 O.sub.3 (n=1 and 2), are synthesized hydrothermally using commercially available hydroxide reactants. The synthesis is carried out in an aqueous suspension within an autoclave under a pressure of 4 Mega-Pascals (MPa) and at a corresponding saturated steam temperature of 523.degree. K. Powder characterization has shown that the particle size ranges from 2 to 10 .mu.m. Sintering of preformed green bodies comprising compressed powder, without the use of additives, is then carried out at 1873.degree. K. in one atmosphere, resulting in a spinel having a density 94% of theorietical. Structure and microstructure have been studied by X-ray diffraction and scanning electron microscopy, and compressive strength of the resulting spinels has been determined.
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P. Krijgsman, "Hydrothermal Processing of Ceramic Powders for Alumina-Magnesia Spinels", Solid State Ionics, vols. 32 and 33, Feb./Mar. 1989, pp. 436-439.
P. Krijgsman, "Hydrothermal Synthesis of Ceramic Powders for Magnesia-Alumina Based Spinels", Ceramic Eng. Sci. Proc., 9, 1988, pp. 943-948.
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