Spectral reconstruction of surface adsorbed species using band-target entropy minimization. Application to CO and NO reaction over a Pt/γ-Al2O3 catalyst using in situ DRIFT spectroscopy

S. Chilukoti, E. Widjaja, F. Gao, Huajun Zhang, B.G. Anderson, J.W. Niemantsverdriet, M. Garland

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10 Citations (Scopus)

Abstract

The adsorption of NO and CO was studied on an alumina-supported platinum catalyst by in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS). The temperature range was 50-160°C and a wide variety of partial pressures was used. The band-target entropy minimization (BTEM) algorithm was applied to the DRIFTS data sets resulting in the pure component spectra of numerous species adsorbed on both the Pt (primarily a variety of Pt 0-CO and Pt2+-CO species) and alumina surface (i.e. nitrates, nitrites, bicarbonates, isocyanates) as well as gas-phase species. Thirty-one previously known species were identified as well as 6 new and previously unreported or previously unassigned spectra. The present results indicate that BTEM analysis of DRIFTS data is a very promising tool for the study of heterogeneous catalytic in situ spectroscopic data.
Original languageEnglish
Pages (from-to)3535-3547
JournalPhysical Chemistry Chemical Physics
Volume10
Issue number24
DOIs
Publication statusPublished - 2008

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