B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 32/00 (2006.01) B01D 53/94 (2006.01) B01J 21/08 (2006.01) B01J 37/02 (2006.01) F02B 3/06 (2006.01)
Patent
CA 2055756
In a preferred method, particles of amorphous silica are used to provide a silica coating suitable for carrying dispersed catalyst particles for the treatment of diesel engine exhaust emissions. The silica coating is formed from a mixture consisting essentially of two groups of the fine silica particles of respective average sizes and size ranges which are virtually non-overlapping. The particles of the first of the two groups have a first average size sufficient to permit the particles of the first group (smaller group) to occupy voids between the particles of the second group (larger group) in a packed arrangement, and preferably the second group has a second average size which is at least 20 times greater than the first average size. Although particles of amorphous silica are preferred for use in forming a coating with improved adherence suitable for the treatment of diesel exhaust, the method of the invention is also useful to improve the adherence of coatings formed of other ceramics, such as alumina, titania, zirconia and zeolite.
Bedford Raymond E.
Tsang Chih-Hao Mark
General Motors Corporation
Gowling Lafleur Henderson Llp
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