Catalyst – solid sorbent – or support therefor: product or process – Irradiation by – or application of – electrical – magnetic or...
Patent
1992-11-02
1993-11-23
Dees, Carl F.
Catalyst, solid sorbent, or support therefor: product or process
Irradiation by, or application of, electrical, magnetic or...
502 84, B01J 3734
Patent
active
052644049
ABSTRACT:
A porous clay composite having fine metal particles deposited substantially only on surfaces of inorganic particles which are intercalated between layers of an expandable clay is obtained. After the expandable clay is expanded with a solvent into an expanded clay, the inorganic particles are intercalated between the layers of the expanded clay. The inorganic particles have photo-semiconducting property, that is, a plurality of carriers such as electrons and holes are released from the inorganic particles by irradiation of a light such as ultraviolet light. A solution including metal ions is mixed with the inorganic particles intercalated clay to form a mixed solution thereof. Subsequently, the light is irradiated to the mixed solution to deposit the fine metal particles substantially only on the inorganic particles which are intercalated between the layers of the expanded clay, so that the porous clay composite is formed in the mixed solution. The porous clay composite including the mixed solution is dried by a supercritical drying or a carbon dioxide extractive drying, etc., so as not to disrupt a porous structure thereof. When a metal having oxidation/reduction catalysis is used as the fine metal particles, the porous clay composite functions as an excellent oxidation/reduction catalyst.
REFERENCES:
patent: 4127506 (1978-11-01), Gray et al.
patent: 4629713 (1986-12-01), Suzuki et al.
patent: 4665045 (1987-05-01), Pinnavaia et al.
patent: 5149513 (1992-09-01), Takahama et al.
Journal of Materials Science (Publisher; Chapman and Hall), No. 27 (1992), pp. 1297-1301, "Supercritical Drying of SiO2-TiO2 Sol-Pillared Clays", Published on Mar. 12, 1992.
Sako Toshiharu
Takahama Koichi
Yokoyama Masaru
Dees Carl F.
Matsushita Electric & Works Ltd.
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