Development of a Tar Reforming Catalyst for Integration in a Ceramic Filter Element and Use in Hot Gas Cleaning

Abstract

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.