The catalytic performances of platinum catalysts supported on ZSM-5, ZSM-35 and Beta are explored for the selective catalytic reduction of NO by hydrogen (H(2)-SCR). 1% Pt/ZSM-35 sample exhibits the best activity and a maximum NO conversion of 80.8% can be achieved at 120 degrees C with N(2) selectivity of 68.5% (GHSV = 80,000/h). In situ FTIR spectra are employed to get insight into the type of surface species formed during reaction, and NH(4)(+) is found to be the key intermediate in H(2)-SCR. Effects of platinum loadings on the activity of Pt/ZSM-35 are further studied between 0.1 and 2.0 wt.% Pt loading. Increase of Pt loading beyond 1.0 wt.% leads to an activity decline where a loss of strong acid sites is observed. Meanwhile, XRD and TEM results illustrate an aggregation of Pt species with increasing Pt loading on ZSM-35. (C) 2010 Elsevier B.V. All rights reserved.