Catalytic dehydrogenation

Claim 1

A PROCESS FOR THE DEHYDROGENATION OF MONO-OLEFINS OF FROM 4 TO 5 CARBON ATOMS WHICH COMPRISES CONTACTING SAID MONO-OLEFINS MIXED WITH FROM 2 TO 15 MOLES OF STEAM PER MOLE OF MONO-OLEFIN AT A TEMPERATURE OF ABOUT 580*C. TO ABOUT 700*C. WITH A CATALYST WHICH COMPRISES AN INTIMATE MIXTURE OF ABOUT 10 TO ABOUT 20 WEIGHT PARTS IRON OXIDE, ABOUT 5 TO 30 WEIGHT PARTS OF A POTASSIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF POTASSIUM COMPOUNDS CONVERTIBLE TO PATASSIUM CARBONATE UNDR DEHYDROGENATION CONDITIONS AND POTASSIUM CARBONATE, ABOUT 60 TO 85 WEIGHT PARTS OF MIXTURE OF ALUMINA AND CHROMIA, SAID CHROMIA BEING ABOUT 5 TO 20 WEIGHT PARTS OF THE FINAL CATALYST AND WHEREIN SAID ALUMINA IS 50 PERCENT OF MORE OF THE TOTAL CATALYST, SAID CATALYST HAVING BEEN PREPARED BY MIXING THE IRON OXIDE AND POTASSIUM COMPOUND WITH THE MIXTURE OF ALUMINA AND CHROMIA, THE MIXTURE OF ALUMINA AND CHROMIA HAVING BEEN PREVIOUSLY USED AS A DEHYDROGENATION CATALYST IN A HOUDRY DEHYDROGENATION REACTOR AND HAVING BEEN GROUND TO AN AVERAGE PARTICLE SIZE OF SMALLER THAN ABOUT 1/100 INCH IN DIAMETER PRIOR TO MIXING WITH THE IRON OXIDE AND POTASSIUM COMPOUND.