Catalytic NO–H2–CO–O2 reactions over Pt-supported mesoporous yttrium oxide

Abstract

Catalytic light-off of a stream of NO, H 2 , CO in an excess O 2 has been studied over various metal oxides loading 1 wt% Pt. Because a low-surface area Y 2 O 3 (<5 m 2 g −1 ) was found to exhibit the highest de-NO x activity, a mesoporous Y 2 O 3 was then synthesized from an yttrium-based surfactant mesophase templated by dodecyl sulfate ( DS = C 12 H 25 O SO 3 - ) , which was anion-exchanged by acetate (AcO = CH 3 COO − ). The product showed a 3-D mesoporosity with a large surface area (396 m 2 g −1 ) and the Pt-supported catalyst achieved much improved light-off characteristics suitable for the low-temperature de-NO x in the presence of CO and excess O 2 .