Filter material for the selective removal of siloxanes

1. A filter material for the selective removal of siloxanes from a gas, the filter material comprising a titanium compound, which is an organotitanate.

2. A filter material in accordance with claim 1 , further comprising:

a compound, which can be obtained by partial or complete hydrolysis of an organotitanate.

3. A filter material in accordance with claim 1 , wherein the organotitanate has the formula Ti(OR) 4 , wherein at least one R is a hydrocarbon group with 1 to 10 carbon atoms and remaining R in each case independently represents hydrogen or a hydrocarbon group with 1 to 10 carbon atoms.

4. A filter material in accordance with claim 1 , wherein the organotitanate is selected from the group consisting of tetramethyl titanate, tetraethyl titanate, tetra-n-propyl titanate, tetraisopropyl titanate, tetra-n-butyl titanate, tetra-tert-butyl titanate, tetra-n-hexyl titanate, di-isopropyl-di-n-butyl titanate, tetraphenyl titanate, titanium bis(triethanolamine)-diisopropoxide, titanium bis(triethanolamine)-di-n-butoxide, titanium (triethanolaminato)-isopropoxide, titanium bis(acetylacetonate)-diisopropoxide, titanium bis-(acetylacetonate)di-n-butoxide and mixtures thereof.

5. A filter material in accordance with claim 1 , which contains 10 wt. % to 55 wt. % of titanium compound, calculated as titanium, in relation to an overall weight of the filter material.

6. A filter material in accordance with claim 1 , further comprising a carrier.

7. A filter material in accordance with claim 6 , wherein the carrier is a porous and fibrous carrier.

8. A filter material in accordance with claim 6 , wherein the carrier is a porous particulate carrier and in the form of powder, granules, pellets or porous spheres.

9. A method for the production of filter material for the selective removal of siloxanes from a gas, the method comprising the steps of:

providing a titanium compound, which is an organotitanate or is a compound which can be obtained by hydrolysis of an organotitanate or is both an organotitanate and is a compound which can be obtained by hydrolysis of an organotitanate;

applying a solution of the organotitanate in a solvent to a carrier;

drying the carrier to provide filter material on the carrier; and

subjecting the filter material to conditioning wherein the conditioning is carried out by means of water vapor at 30° C. to 90° C.

10. A method according to claim 9 , further comprising selectively removing siloxanes from a gas using the filter material.

11. A method according to claim 9 , further comprising selectively removing siloxanes from a gas with the titanium compound.

12. A gas sensor, which comprises a filter material comprising a titanium compound, which is an organotitanate or is both an organotitanate and is a compound obtained by hydrolysis of an organotitanate.

13. A gas sensor in accordance with claim 12 , wherein the quantity of titanium compound, calculated as titanium, is 0.1 mg/cm 2 to 100.0 mg/cm 2 in relation to a gas inlet area of the gas sensor.

14. A gas sensor in accordance with claim 12 , wherein the titanium compound obtained by hydrolysis is obtained by a partial or complete hydrolysis of an organotitanate.

15. A gas sensor in accordance with claim 12 , wherein the organotitanate has the formula Ti(OR) 4 , wherein at least one R is a hydrocarbon group with 1 to 10 carbon atoms and remaining R in each case independently represents hydrogen or a hydrocarbon group with 1 to 10 carbon atoms.

16. A gas sensor in accordance with claim 12 , wherein the organotitanate is selected from the group consisting of tetramethyl titanate, tetraethyl titanate, tetra-n-propyl titanate, tetraisopropyl titanate, tetra-n-butyl titanate, tetra-tert-butyl titanate, tetra-n-hexyl titanate, di-isopropyl-di-n-butyl titanate, tetraphenyl titanate, titanium bis(triethanolamine)-diisopropoxide, titanium bis(triethanolamine)-di-n-butoxide, titanium (triethanolaminato)-isopropoxide, titanium bis(acetylacetonate)-diisopropoxide, titanium bis-(acetylacetonate)di-n-butoxide and mixtures thereof.

17. A gas sensor in accordance with claim 12 , wherein the titanium compound forms a part of filter material and the titanium compound, calculated as titanium, is 10 wt. % to 55 wt. % in relation to an overall weight of the filter material.

18. A gas sensor in accordance with claim 17 further comprising a porous carrier.

19. A filter material in accordance with claim 3 , wherein each of the hydrocarbon groups is interrupted by one or more —O—, —NH—, —N═ and/or —C(O)— and/or being substituted by one or more —OH and/or NH 2 .

20. A filter material in accordance with claim 19 , wherein two or three of the hydrocarbon groups are linked together forming a monocyclic or bicyclic ring and the organotitanate is a tetraalkyl titanate and/or tetraaryl titanate.

21. A filter material in accordance with claim 4 , wherein the organotitanate is selected from the group consisting of tetraisopropyl titanate, tetra-n-butyl titanate and mixtures thereof.

22. A filter material in accordance with claim 7 , wherein the carrier is a porous glass fiber mat.