Selective catalytic reduction of nitric oxide by hydrogen over Zn-ZSM-5 and Pd and Pd/Ru based catalysts

•A non-noble metal catalyst, Zn-ZSM-5, was studied for the first time for H2-SCR of NO.•Zn-ZSM-5 catalyst was active for H2-SCR of NO.•One NOx conversion peak observed on Zn-ZSM-5 vs. two peaks observed on noble metal supported catalysts.•H2-TPD results showed strong chemisorption of hydrogen on Zn-ZSM-5.•Both Zn cations and the zeolite framework contributed to hydrogen chemisorption.