CuZSM5 catalysts, prepared by ion exchange of HZSM5 (Si/Al = 80), enable selective lean NOχ reduction at the spark ignition engine exhaust. All catalysts, even if exchanged to very high copper loading (556% apparent exchange level) give no evidence for segregated copper oxide phases. In the presence of water they are easily reduced in vacuum at 550°C and are stable to redox cycles (O2, vacuum) treatments. Increasing Cu content to about 200% apparent exchange level results in increasing NOχ, CO and HC conversions. From 200 to 550% exchange CuZSM5 catalysts give similar performances. Preliminary investigation shows that after catalytic tests there is evidence for CuO formation only in the copper-richest catalysts.
Lean NOx reduction CuZSM5 catalysts: Evaluation of performance at the spark ignition engine exhaust / P., Ciambelli; P., Corbo; M., Gambino; G., Minelli; Moretti, Giuliano; Porta, Piero. - In: CATALYSIS TODAY. - ISSN 0920-5861. - STAMPA. - 26:(1995), pp. 33-39. [10.1016/0920-5861(95)00098-Z]
Lean NOx reduction CuZSM5 catalysts: Evaluation of performance at the spark ignition engine exhaust
MORETTI, GIULIANO;PORTA, Piero
1995
Abstract
CuZSM5 catalysts, prepared by ion exchange of HZSM5 (Si/Al = 80), enable selective lean NOχ reduction at the spark ignition engine exhaust. All catalysts, even if exchanged to very high copper loading (556% apparent exchange level) give no evidence for segregated copper oxide phases. In the presence of water they are easily reduced in vacuum at 550°C and are stable to redox cycles (O2, vacuum) treatments. Increasing Cu content to about 200% apparent exchange level results in increasing NOχ, CO and HC conversions. From 200 to 550% exchange CuZSM5 catalysts give similar performances. Preliminary investigation shows that after catalytic tests there is evidence for CuO formation only in the copper-richest catalysts.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
