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A commercial NO x -storage catalyst for gasoline applications containing platinum, palladium and rhodium together with Ba/CeO 2 /Al 2 O 3 has been sulfated on the engine bench at 390 and 510°C with nominal exposures of 0.3 and 1.3gsulphur/l catalyst. Exposures of 0.3g/l are too low to have a notable impact on the catalytic performance. At 390°C, the sulphur is quantitatively...
An adsorber containing refractory zeolites, for example, dealuminated mordenite, dealuminated zeolite Y, and/or zeolite ZSM-5 with SiO 2 Al 2 O 3 molar ratios of >8 is used to remove Pb, P, S, Zn, and other contaminants from the exhaust gases. The adsorbents may be doped with Cu, Fe, Na, and/or K or may be in the acid H-form.
Gravimetric temperature programmed oxidation was used to study the combustion of a diesel soot mixed with copper catalysts supported on La 2 O 3 or La 2 O 2 CO 3 . In a first step, different systems associating copper oxide with an other metal oxide were prepared and tested in presence of SO 2 . The association of copper and niobium was found the most...
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