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Selective catalytic reduction of NOx with hydrogen (H2-SCR) in excess oxygen over Pd and Ir based catalysts with various silica supports was studied. The Pd/V2O5/TiO2/SBA-15 and Ir/SBA-15 catalysts showed the highest activities. The effects of noble metal, various silica supports, CO and SO2 on H2-SCR over these catalysts were also studied and compared, and possible underlying mechanisms discussed...
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