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The development of a suitable tar reforming catalyst for integration in a ceramic hot gas filter element is presented. Calcined dolomite, CaO-Al 2 O 3 mixed oxide, and MgO were used as catalyst supports with a grain size fraction between 0.1 and 0.3 mm for Ni doping. The activity of the catalysts with regard to the benzene and naphthalene conversion with and without additional Ru doping was examined. A MgO supported Ni catalyst with a NiO loading of 6% was found to be the most active catalyst in naphthalene reforming in the presence of 100 ppmv H 2 S at 800°C and a filtration velocity of 90 m/h using model biomass gasification gas containing 5 g/N m 3 naphthalene. Complete naphthalene conversion was still achieved after 100 h. After integration of the MgO-Ni catalyst in the ceramic filter element, a differential pressure increase of 6.8 mbar at 25°C was measured, thus indicating the technical relevance of the developed catalyst for use in hot gas cleaning of biomass gasification gas.

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The urea method was applied to deposit a nickel-calcium catalyst inside porous filter discs to develop a gas cleaning technique involving the combined removal of tars and particles from hot biomass gasification gas. Some catalytic filter discs were tested in typical filtration conditions for the decomposition of the model tar compound benzene in a simulated biomass gasification gas containing representative amounts of H 2 S. H 2 S-deactivation studies showed a significant improvement in the sulfur resistance of the nickel catalyst on the filter discs by the addition of CaO to the catalyst formulation. The optimisation of the ratio between Ni and CaO and the effect of nickel content in the catalyst formulation on the catalytic performance were investigated.