FTIR study of the photo-induced reaction of NO + CO on Rh/TiO2

Literature Information

Publication Date 2001-09-03
DOI 10.1039/B103627K
Impact Factor 3.676
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Abstract

The effect of UV illumination on the stability of Rh dicarbonyl on TiO2 and on the surface interaction of NO + CO gas mixture on TiO2 and Rh/TiO2 catalysts was examined with FTIR spectroscopy. Photolysis of Rh1(CO)2 over TiO2 caused the decomposition of this complex, and the formation of Rhx–CO and Rh2(CO)3 surface compounds. Illumination of the NO + CO/TiO2 system at 200 K produced a new band at 2212 cm−1, which is attributed to the Ti–NCO species. This species is not observed in the absence of illumination even after extended adsorption time. Coadsorption of NO + CO gas mixture on Rh/TiO2 gave an absorption band at 2160–2175 cm−1, not detected after adsorption of NO and CO separately. This band is assigned to the vibration of NCO bonded to the Rh. UV illumination dramatically enhanced the surface concentration of Rh–NCO surface species at both 200 and 300 K. It is assumed that the extent of the electron transfer from TiO2 to the Rh is enhanced due to the photoelectrons which leads to the greater probability of the surface dissociation of NO, the key step in the formation of NCO surface complex.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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