Chromium-silica catalysts by hydrothermal treating

Details Chromium-silica catalysts by hydrothermal treating Chromium-silica catalysts by hydrothermal treating

1979-04-16

1980-12-09

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

526106, B01J 2326, B01J 2108

Patent

active

042383692

ABSTRACT:
A catalyst composition of a chromium compound supported on a silica-containing substrate is prepared by contacting the silica-containing substrate with a gaseous carrier containing water vapor at a temperature in the range above about 1100.degree. F. to about 2000.degree. F. for a time sufficient to effect a broadening of molecular weight distribution of polymers produced using the catalyst. In further embodiments, the catalyst prepared by the method described above and a method for preparing polymers of ethylene using the catalyst prepared by the method described above.

REFERENCES:
patent: 2951816 (1960-09-01), Hogan et al.
patent: 3288767 (1966-11-01), Hogan et al.
patent: 3622521 (1971-11-01), Hogan
patent: 3887494 (1975-06-01), Dietz
patent: 3950316 (1976-04-01), Witt

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