deionized water under vigorous stirring next 29 7 grams of a hexachloroiridium acid solution h 2 ircl 6 24 27 wt ir umicore hanau germany are added to the suspension under stirring and diluted with 50 ml of deionized water the suspension is then heated to 70 u00b0 c after reaching the temperature 50 ml of a 0 1 m naoh solution are added and diluted with further 500 ml of deionized water the final ph of 7 5 is adjusted using 10 wt naoh temperature and ph are kept at the same level for about 4 hours finally the product is isolated by filtration and washed with 1 5 liters of deionized water the catalyst is dried in an vacuum oven overnight the product is then calcined at 400 u00b0 c in an box oven in air for 1 hour the bet surface area remains very high at 59 m 2 g thus indicating the excellent catalytic activity of the material 150 ml of deionized water are poured into a 2 liter beaker 24 86 grams of hexachloroiridiumacid hydrate 38 65 wt ir umicore hanau germany are dissolved in 50 ml of deionized water the solution is added to the beaker under vigorous stirring and diluted with 50 ml of deionized water two times the solution is heated to 70 u00b0 c after having reached the temperature 4 grams of naoh are dissolved in 50 ml.