Selenium or tellurium treated silica

Details Selenium or tellurium treated silica Selenium or tellurium treated silica

1980-03-14

1981-10-20

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252458, 526104, B01J 2106, B01J 2700

Patent

active

042959985

ABSTRACT:
A process comprising treating silica with at least one of selenium or tellurium under nonoxidizing conditions at a temperature of at least 370.degree. C. and a subsequent second step wherein the thus-treated silica is contacted with an oxidizing ambient at a temperature within the range of 370.degree.-900.degree. C. The silica can contain a chromium compound in which case the resulting product is suitable as a catalyst for the production of higher melt flow olefin polymers suitable for such applications as injection molding, and the like requiring a relatively narrow molecular weight distribution.

REFERENCES:
patent: 2331292 (1943-10-01), Archibald et al.
patent: 3121706 (1964-02-01), Feay et al.
patent: 3147239 (1964-09-01), Canterine et al.
patent: 3546312 (1970-12-01), Heckelsburg et al.
patent: 3887494 (1975-06-01), Dietz
patent: 4041224 (1977-09-01), Hoff et al.
patent: 4053436 (1977-10-01), Hogan et al.
patent: 4080426 (1978-03-01), Kittrell et al.
patent: 4151122 (1979-04-01), McDaniel et al.
patent: 4177162 (1969-12-01), McDaniel et al.

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