MARSHALL CORNELIUS FREERKS, DDS
Dentist in Saint Louis, MO
License number
Missouri 14600
Category
Dentist
Type
Dentist
License number
Missouri 14600
Category
Ambulatory Health
Type
Dental
Address
Address
6744 Clayton Rd. Suite 204 St., Saint Louis, MO 63117
Phone
(314) 725-5515
Professional information
Dr. Marshall C Freerks, Saint Louis MO - DDS (Doctor of Dental Surgery)
Specialties:
Dentistry
Address:
6744 Clayton Rd STE 204, Saint Louis 63117
(314) 725-5515 (Phone)
(314) 725-5515 (Phone)
Languages:
English, Italian
Process For Preparing Phosphorus-Vanadium-Oxygen Catalysts
US Patent:
3977998, Aug 31, 1976
Filed:
Sep 3, 1974
Appl. No.:
5/502475
Inventors:
Marshall C. Freerks - Kirkwood MO
Ramon A. Mount - St. Louis MO
Ramon A. Mount - St. Louis MO
Assignee:
Monsanto Company - St. Louis MO
International Classification:
B01J 2718
US Classification:
252435
Abstract:
The performance of phosphorus-vanadium-oxygen catalysts useful for the conversion of saturated aliphatic hydrocarbons to maleic anhydride is dependent on the controlled calcination of the catalyst precursor. Phosphorus-vanadium-oxygen catalysts are prepared by mixing phosphorus and vanadium compounds to form precursors containing tetravalent vanadium, and calcining the precursors in an oxidizing atmosphere until a controlled level of pentavalent vanadium has been achieved, and then calcining the precursors in an inert atmosphere to higher temperatures to provide catalysts with the desired oxidation levels that are promptly active, so that valuable manufacturing facilities are not required to "activate the catalyst. ".
Process For Manufacturing Maleic Anhydride
US Patent:
4304723, Dec 8, 1981
Filed:
Sep 22, 1980
Appl. No.:
6/189535
Inventors:
Marshall C. Freerks - Kirkwood MO
Assignee:
Monsanto Company - St. Louis MO
International Classification:
C07D30760
US Classification:
26034675
Abstract:
Catalyst activity is substantially increased in phosphorus-vanadium-oxygen catalysts for the preparation of maleic anhydride from saturated hydrocarbons having 4 to 10 carbon atoms by the addition of boron to the catalyst composition.