Abstract
Cu/ZSM-5 is able to catalyze the reduction of NOx to N2 (NH3-SCR), but the poisoning effect of K in this regard has been barely studied. Herein, the poisoning effect of K with respect to Cu/ZSM-5 in NH3-SCR was established via catalytic testing, and both Cu/ZSM-5 and K-poisoned Cu/ZSM-5 were probed by using XRD, N2 sorption, TEM, H2-TPR, XPS, NH3-TPD, and NO-TPD. In addition to these characterization tools, in-situ DRIFTS was employed to probe the adsorbed species and reaction intermediates, thus giving important information about the possible reaction mechanisms. In all, the presence of K led to decreased exposure of active CuO dispersed on ZSM-5, inhibited the adsorption of NH3 and NOx to some extent, minimized the formation of active bridged nitrate, and facilitated the formation of inactive bidentate nitrate.
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