Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1980-02-28
1981-10-20
Dees, Carl F.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252458, 526106, B01J 2702, B01J 2326, B01J 2108
Patent
active
042959977
ABSTRACT:
A method for producing activated catalysts in which a catalyst containing chromium on a silica-containing support is (1) contacted with a gaseous environment consisting essentially of sulfur dioxde and oxygen at a temperature in a range of about 450.degree. C. to about 1100.degree. C. for a time ranging from about one to about five hours and (2) subsequently maintaining a temperature within the contact temperature range while contacting the catalyst with a gaseous environment consisting essentially of oxygen and gases inert to reaction with the catalyst. In another embodiment of the invention the temperature for a succeeding step is not raised above that attained in the previous step. In an embodiment of the invention the catalyst is contacted with a gaseous environment consisting essentially of oxygen and gases inert to reaction with the catalyst while the temperature is being increased prior to contact with sulfur dioxide.
REFERENCES:
patent: 3037008 (1962-05-01), Garetson et al.
patent: 3091605 (1963-05-01), Hull et al.
patent: 3362946 (1968-01-01), Hogan
patent: 3780001 (1973-12-01), Pullukat et al.
patent: 4177162 (1979-12-01), McDaniel
McDaniel Max P.
Welch Melvin B.
Dees Carl F.
Phillips Petroleum Company
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