Weakly acidic colloidal dispersions of cerium (IV) compounds

Details Weakly acidic colloidal dispersions of cerium (IV) compounds Weakly acidic colloidal dispersions of cerium (IV) compounds

1990-12-17

1992-07-21

Lovering, Richard D.

Compositions

Preservative agents

Anti-corrosion

252314, 423 215, 423263, 502304, B01J 1300

Patent

active

051320487

ABSTRACT:
Weakly acidic colloidal aqueous dispersions of particulates of a cerium (IV) compound, having a pH ranging from 1.5 to 5, well adapted for catalyst applications, are prepared by (a) acidulating a cerium (IV) hydroxide with an acid having a pKa ranging from 2.5 to 5.0, or with a salt or mixture thereof, (b) next separating the resulting cerium (IV) compound that precipitates from the medium of acidulation, and then (c) colloidally dispersing such cerium (IV) precipitate in an aqueous medium.

REFERENCES:
patent: 3761571 (1973-09-01), Woodhead
patent: 4181532 (1980-01-01), Woodhead
patent: 4356106 (1982-10-01), Woodhead
patent: 4699732 (1987-10-01), Woodhead
patent: 4940685 (1990-07-01), Sauvion et al.
patent: 4965057 (1990-10-01), David et al.
patent: 5002747 (1991-03-01), Le Loarer
patent: 5021192 (1991-06-01), David et al.
Derwent Abstract EP-316205.
Derwent Abstract EP-239477.
Derwent Abstract EP-208581.

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