Bobby Glynn Hendricks

US Patent:

40767540, Feb 28, 1978

Filed:

Jan 20, 1976

Appl. No.:

5/650801

Inventors:

Gary L. Kiser - Seabrook TX
Bobby G. Hendricks - Deer Park TX

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C07C 4516

US Classification:

260603C

Abstract:

In a process for the manufacture of formaldehyde by the silver-catalyzed oxidation of methanol in two stages, a composite catalyst is used in the second oxidation stage, which is prepared by sintering an upstream layer of foraminous silver having a void volume of 75 to 90% contiguous to a downstream layer of crystalline silver particles having a void volume of 65 to 75% which is at least about 5% below the void volume of the upper layer.