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1. WO2012066295 - OZONE DECOMPOSITION CATALYST FOR USE IN A STERILISATION AND/OR DECONTAMINATION PROCESS

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[ EN ]

Claims

Use of a catalyst for the conversion of ozone to oxygen at a temperature of less than 40°C in a humid environment, the catalyst comprising at least one catalytically active metal or metal oxide supported on a mixed titanium/silicon oxide support.

Use of a catalyst as claimed in claim 1 wherein the at least one catalytically active metal is selected from the group consisting of iron, cobalt, nickel, silver, copper, manganese, zinc and any platinum group metal or any oxide thereof.

Use of a catalyst as claimed in claim 2 wherein the at least one catalytically active metal is a platinum group metal.

Use of a catalyst as claimed in claim 3 wherein the platinum group metal is palladium.

Use of a catalyst as claimed in any one of claims 1 to 4 wherein the temperature is in the range 10-30°C.

A method of sterilising, sanitising and/or decontaminating an enclosed environment, the method comprising the steps of:

a) producing a humidified enclosed environment;

b) discharging ozone into the humidified environment;

c) maintaining the ozone and water pressure levels at a concentration that will achieve the required degree of decontamination, sterilisation and/or sanitation of the humid

environment; and

d) passing the substantially decontaminated, sterilised and/or sanitised environment through an ozone depletion catalyst to reduce the concentration of ozone to a predetermined level, the catalyst comprising at least one catalytically active metal or metal oxide supported on a mixed titanium/silicon oxide support.

7. A method according to claim 6 wherein the catalyst is a mixed titanium/silicon oxide support impregnated with an active metal selected from the group consisting of iron, cobalt, nickel, silver, copper, manganese, zinc and any platinum group metal or any oxide thereof.

8. A method according to claim 7 wherein the catalyst is a mixed titanium/silicon oxide support impregnated with at least one platinum group metal.

9. A method according to claim 8 wherein the catalyst is a mixed titanium/silicon oxide support impregnated with palladium.

10. A method according to any of claims 6 to 9 wherein the temperature is between 10 - 30°C.

11. A method according to any one of claims 6 to 10 further comprising replenishing the humidity and ozone levels in step (c) to maintain effective levels for decontamination.

12. A method according to any one of claims 6 to 11 further comprising step (e) introducing a hydrocarbon having a secondary olefinic carbon

carbon double bond into the enclosed environment to react preferentially with the discharged ozone.

A method according to any one of claims 6 to 12 further comprising passing a substantially dry inert gas through the ozone depletion catalyst prior to and/or after each decontamination process.

A method as claimed in claim 13 wherein the substantially dry gas is passed through the catalyst at intervals between a predetermined number of repeat decontamination processes.

A method as claimed in any one of claims 6 to 14 further comprising the step of dehumidifying the ozone rich atmosphere prior to its passage through the catalyst.

Sterilisation and decontamination apparatus comprising a humidifier unit, an ozone discharge unit, an ozone depletion catalyst and a controller by which the humidifier unit and ozone discharge unit are controllable based on predetermined conditions, the ozone depletion catalyst comprising at least one catalytically active metal or metal oxide supported on a mixed titanium/silicon oxide support.