Abstract

Alumina-carbon nanotube (Al 2 O 3 -CNT) supports were prepared by the decomposition of acetylene on Al 2 O 3 . The subsequent impregnation of Pt and Ba yielded Pt/Ba/Al 2 O 3 -CNT. Pt/Ba/Al 2 O 3 -CNT was characterized by X-ray diffraction, scanning and transmission electron microscopies, N 2 physisorption, X-ray photoelectron spectroscopy, and in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The relationship between the structure and properties of Pt/Ba/Al 2 O 3 -CNT was investigated. Pt/Ba/Al 2 O 3 -CNT exhibited much higher resistance to SO 2 poisoning and better regeneration ability than Pt/Ba/Al 2 O 3 , during NO x reduction in the presence of SO 2 . In-situ DRIFTS spectra suggested that SO 2 had no effect on the NO x storage and reduction process. Pt/Ba/Al 2 O 3 -CNTs exhibited high resistance against sulfur poisoning, and good regeneration ability in NO x removal, in comparison with Pt/Ba/Al 2 O 3 .

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