Pt/SSZ-13 as an efficient catalyst for the selective catalytic reduction of NOx with H2

Abstract

Superior activity and selectivity of a Pt/SSZ-13 catalyst in the selective catalytic reduction of NO_x with H₂ (H₂-SCR) were observed, in comparison with those of Pt/ZSM-5 and Pt/SAPO-34 catalysts. A maximum NO_x conversion of 81% can be achieved at 100 °C on Pt/SSZ-13 with a N₂ selectivity of 93% (GHSV = 50 000 h⁻¹). Meanwhile, the Pt/SSZ-13 catalyst exhibited better SO₂ and H₂O resistance and reaction durability than the other two Pt catalysts. The influence of NO₂ on H₂-SCR activity was investigated. It was found that the increase of NO₂ concentration in the feed gas mixture led to an activity decline. In addition, the possible H₂-SCR reaction routes over the Pt/SSZ-13 catalyst at different temperatures were proposed. The results of this study suggested that Pt/SSZ-13 is a promising candidate as a catalyst for H₂-SCR with great potential for either mobile or stationary sources.