Nitrous oxide decomposition over Al2O3 supported noble metals (Pt, Pd, Ir): Effect of metal loading and feed composition (original) (raw)

2015, Journal of Environmental Chemical Engineering

The de-N 2 O performance of low content (0.25, 0.5 and 1.0 wt. %), Al 2 O 3 supported noble metals (Pt, Pd, Ir) is comparatively explored in the present study. Several parameters related to the effect of temperature, metal content and feed composition are investigated. An extensive characterization study involving BET, TPR, XRD and TEM was also carried out to reveal the impact of metal entity and content on the structural, morphological and redox characteristics of the catalysts. The results imply that the de-N 2 O performance is in general increased upon increasing metal loading, a fact being more intense over Ir-based catalyst. Under oxygen deficient conditions N 2 O conversions as high as ~100% and ~80% are reached at 600 o C over Ir-and Pd-based catalysts, respectively, instead of ~30% achieved over Pt-based catalysts. A moderate deactivation in oxygen excess conditions is observed with Ir and Pd catalysts, while Pt-based catalysts are totally deactivated. The enhanced de-N 2 O performance of Ir-, Pd-based catalyst can be mainly interpreted taking into account the formation of active metal oxide phases, not easily susceptible to oxygen poisoning.

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