USE OF A CATALYST BASED ON NOBLE METAL FOR REDUCING THE TAR CONTENT IN GASES RESULTING FROM GASIFICATION PROCESSES
The invention relates to a method for reducing the tar content in gases resulting from a thermochemical gasification process of carbon-containing starting material and includes contacting of at least a part of the gas obtained from the gasification process with a catalyst containing noble metals, wherein the noble metals include at least two noble metals selected from the group consisting of Pt, Pd, Rh, Ir, Os, Ru and Re.
1 . Method for the reduction of a tar content in gases from a gasification process from carbon-containing starting materials, comprising bringing gas obtained from a gasification process into contact with a noble metal-containing catalyst, wherein the noble metal-containing catalyst comprises at least two noble metals selected from the group consisting of Pt, Pd, Rh, Ir, Os, Ru and Re.
2 . Method according to claim 1 , characterized in that the noble metal-containing catalyst comprises Pt and Rh.
3 . Method according to claim 1 , characterized in that the noble metal-containing catalyst is applied to a support or is present as a bulk material catalyst.
4 . Method according to claim 1 , characterized in that the noble metal containing catalyst is applied to a support in the form of a honeycomb.
5 . Method according to one of claim 3 , characterized in that the support is selected from the group consisting of cerium oxide (CeO x ), lanthanum oxide (La 2 O 3 ), aluminium oxide (AI 2 O 3 ), yttrium oxide (Y 2 O 3 ), titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), silicon oxide (SiO 2 ) and mixtures thereof.
6 . Method according to claim 1 , characterized in that the bringing of the gas into contact with the noble metal-containing catalyst takes place in the gasification reactor or in an external reactor.
7 . Method according to claim 1 wherein the gas contacted with the catalyst further comprises tar comprising mixtures of cyclic and polycyclic aromatics.
8 . Method according to claim 1 , characterized in that the gasification process comprises a biomass gasification process.
9 . (canceled)
10 . (canceled)
11 . (canceled)
12 . (canceled)
13 . (canceled)
14 . Method for the preparation of synthesis gas with reduced tar content using a noble metal-containing catalyst comprising bringing fuel gases obtained from a gasification process into contact with a noble metal-containing catalyst, wherein the noble metal-containing catalyst comprises at least two noble metals selected from the group consisting of Pt, Pd, Rh, Ir, Os, Ru and Re.
15 . Method of claim 7 wherein the aromatics have a molecular weight more than about 78 g/mol.
16 . Method according to one of claim 4 , characterized in that the support is selected from the group consisting of cerium oxide (CeO x ), lanthanum oxide (La 2 O 3 ), aluminium oxide (AI 2 O 3 ), yttrium oxide (Y 2 O 3 ), titanium oxide (TiO 2 ), zirconium oxide (ZrO 2 ), silicon oxide (SiO 2 ) and mixtures thereof.
17 . The method of claim 1 wherein the noble metal-containing catalyst comprises Pt and Ir.
18 . The method of claim 2 wherein the weight ratio of Pt to Rh is from 1:10 to 10:1.
19 . The method of claim 2 wherein the weight ratio of Pt to Rh is from 1:1 to 6:1.
20 . The method of claim 2 wherein the weight ratio of Pt to Rh is from 2:1 to 4:1.
21 . The method of claim 17 wherein the weight ratio of Pt to Ir is from 1:1 to 6:1.
22 . The method of claim 17 wherein the weight ratio of Pt to Ir is from 2:1 to 4:1.
23 . The method of claim 1 further comprising Ni.
24 . The method of claim 23 wherein the noble metals are selected from the group consisting of a) platinum and rhodium and b) platinum and ruthenium.
25 . The method of claim 24 wherein the weight ratio of Ni to noble metals comprises 5:1 to 20:1.