Combined TPD and FTIR studies of Co/ZrO 2  catalysts: determination of the cobalt dispersion | Zendy

Hadjiivanov K. | Zendy; Panayotov D. | Zendy; Avreyska V. | Zendy; Tsyntsarski B. | Zendy; Klissurski D. | Zendy; Marinova Ts. | Zendy

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Combined TPD and FTIR studies of Co/ZrO 2 catalysts: determination of the cobalt dispersion

Author(s) -

Hadjiivanov K.,

Panayotov D.,

Avreyska V.,

Tsyntsarski B.,

Klissurski D.,

Marinova Ts.

Publication year - 2002

Publication title -

surface and interface analysis

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.52

H-Index - 90

eISSN - 1096-9918

pISSN - 0142-2421

DOI - 10.1002/sia.1259

Subject(s) - cobalt , catalysis , desorption , chemistry , fourier transform infrared spectroscopy , dispersion (optics) , cubic zirconia , analytical chemistry (journal) , thermal desorption spectroscopy , adsorption , inorganic chemistry , organic chemistry , chemical engineering , physics , optics , ceramic , engineering

Adsorption of NO on cobalt catalysts supported on zirconia and sulphated zirconia results in the formation of three main types of species: Zr 4+ (SO 4 2− )‐NO and Zr 4+ (NO 3 − )‐NO nitrosyls (infrared band at 1940‐1906 cm −1 ), which are of low stability (temperature‐programmed desorption maximum at 55–80°C); Co 2+ (NO) 2 geminal nitrosyls (set of bands at 1903‐1868 and 1814‐1777 cm −1 ) characterized by temperature‐programmed desorption maxima at 90–100°C; and linear Co n + ‐NO species (1942‐1858 cm −1 ) desorbing at 120–140°C. On the basis of the results obtained, a simple temperature‐programmed desorption technique for determination of the cobalt dispersion is developed. Copyright © 2002 John Wiley & Sons, Ltd.

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