Adverse effects of Potassium on NOx reduction over Di-Air catalyst

Abstract The influence of potassium in Rh/CZ catalysts was studied toward NO x reduction reactivity and selectivity. The results are compared with a Rh/CZ catalyst. The samples were characterised by N 2 adsorption, XRD, SEM, ICP, and H 2 -TPR. The study highlighted the importance of stored NO x regeneration over potassium in determining the overall performance of the Rh/K/CZ catalyst. The NO x stored over Rh/K/CZ in the previous NO gas stream cannot be regenerated sufficiently during the C 3 H 6 gas stream, and stored NO x gradually decreased from one cycle to the next, resulting in deteriorating performance of Rh/K/CZ. Besides, problem of NO x slip the formation of both NH 3 and N 2 O were observed by the addition of potassium into the Rh/CZ catalyst system.