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AssigneeExxon Research & Engineering Co.
InventorsGary B. McVicker, Joseph J. Eggert
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A method is described for the preparation of high surface area metal fluorides and metal oxyfluorides comprising reacting high surface area metal oxides with a fluorocarbon vapor wherein the fluorocarbon is selected from the group consisting of CH.sub.4-Q F.sub.Q wherein Q is 1 to 3 and totally or partially fluorinated C.sub.2 -C.sub.6 alkanes, alkenes and alkynes and C.sub.5 -C.sub.6 cyclic alkanes, preferably fluoroform (CHF.sub.3) wherein the metal oxides and the fluorocarbon vapors are contacted at a temperature of from about 300.degree. to about 800.degree. C., for a time sufficient to effect the essentially complete conversion of the metal oxides into metal fluorides or the partial conversion of the metal oxides into metal oxyfluorides. The metal oxides converted into metal fluorides may be selected from the group consisting of the oxides of sodium, potassium, lithium, cesium, magnesium, calcium, barium, strontium, tin, antimony, bismuth, titanium, zirconium, vanadium, chromium, manganese, iron, cobalt, rhodium, mercury, nickel, copper, silver, zinc, cadmium, lead, uranium, europium, idium, lutetium, neodymium, thallium and mixtures thereof. The metal oxides converted into metal oxyfluorides may be selected from the group recited above and further include silicon, niobium, hafnium, tantalum, molybdenum, tungsten, technetium, rhenium, osmium, iridium, lanthanum and ruthenium. The above metal oxides may also be utilized in combination with alumina and silica. The fluorocarbon partial pressure in the treatment vapor may be in the range of from about 0.001 to about 100 atmosphere. By the practice of the instant invention high surface area metal fluoride extrudates are prepared by the conversion of metal oxide extrudate, particularly aluminum fluoride extrudates from alumina extrudates.
A process for the preparation of high surface area metal fluorides comprising reacting a metal oxide selected from the group consisting of the oxides of sodium, potassium, lithium, cesium, magnesium, calcium, barium, strontium, tin, antimony, bismuth, titanium, zirconium, vanadium, chromium, manganese, iron, cobalt, rhodium, mercury, nickel, copper, silver, zinc, cadmium, lead, uranium, europium, indium, lutetium, neodymium, thallium and mixtures thereof with a fluorocarbon selected from the group consisting of CH.sub.4-Q F.sub.Q wherein Q is 1 to 3 and partially and totally fluoridated C.sub.2 -C.sub.6 alkanes, alkenes, alkynes and C.sub.5 -C.sub.6 cyclic alkanes wherein the metal oxide and the fluorocarbon are contacted at a temperature of from 300.degree. to 800.degree. C. at a fluorocarbon partial pressure of from 0.001 to 100 atmospheres, for a time sufficient to effect the substantially complete conversion of the metal oxide into metal fluoride.
A process for the preparation of high surface area aluminum fluoride extrudates comprising reacting a high surface area alumina extrudate with a fluorocarbon selected from the group consisting of CH.sub.4-Q F.sub.Q wherein Q is 1-3 and partially and totally fluoridated C.sub.2 -C.sub.6 alkanes, alkenes, alkynes and C.sub.5 -C.sub.6 cyclic alkane wherein the alumina extrudate and the fluorocarbon are contacted at a temperature of from 300.degree. to 800.degree. C. at a fluorocarbon pressure ranging from 0.001 to 100 atm for a time sufficient to affect the essentially complete conversion of the alumina to an aluminum fluoride extrudate.
High surface area aluminum fluoride extrudates prepared by reacting a high surface area alumina extrudate with a fluorocarbon selected from the group consisting of CH.sub.4-Q F.sub.Q wherein Q is 1 to 3 and partially and totally fluoridated C.sub.2 -C.sub.6 alkanes, alkenes, alkynes and C.sub.5 -C.sub.6 cyclic alkanes wherein the alumina extrudate and the fluorocarbon are contacted at a temperature of from about 300.degree. to about 800.degree. C. at a fluorocarbon partial pressure of from about 0.001 to about 1 atmosphere for a time sufficient to effect the substantially complete conversion of the alumina extrudate into the aluminum fluoride extrudate.
High surface area mixed metal-aluminum fluorides prepared by reacting a metal oxide selected from the group consisting of the oxides of sodium, potassium, lithium, cesium, magnesium, calcium, barium, strontium, tin, antimony, bismuth, titanium, zirconium, vandium, chromium, manganese, iron, cobalt, rhodium, mercury, nickel, copper silver, zinc, cadmium, lead, uranium, europium, indium, lutetium, neodymium and thallium in combination with alumina with a fluorocarbon selected from the group consisting of CH.sub.4-Q F.sub.Q wherein Q is 1 to 3 and partially and totally fluoridated C.sub.2 -C.sub.6 alkanes, alkenes, alkynes and C.sub.5 -C.sub.6 cyclic alkanes wherein the metal oxide and the fluorocarbon are contacted at a temperature of from about 300.degree. to about 800.degree. C. at a fluorocarbon partial pressure of from about 0.001 to about 1 atmosphere for a time sufficient to effect the substantially complete conversion of the mixed metal-aluminum oxide into the mixed metal-aluminum fluoride.
Dependencies are inferred from the claim text.