Combined TPD and FTIR studies of Co/ZrO2 catalysts: determination of the cobalt dispersion

• Published in: Surface and interface analysis Vol. 34; no. 1; pp. 88 - 91
• Main Authors: Hadjiivanov, K., Panayotov, D., Avreyska, V., Tsyntsarski, B., Klissurski, D., Marinova, Ts
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.08.2002; Wiley
• Subjects: adsorption; Catalysis; Catalytic reactions; Chemistry; cobalt; Exact sciences and technology; FTIR spectroscopy; General and physical chemistry; nitrogen monoxide; Solid-gas interface; Surface physical chemistry; temperature-programmed desorption; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; zirconia; Infrared spectrometry; Gas solid adsorption; Catalytic reaction; Fourier transform spectroscopy; TDS; Zirconium oxide; Nitric oxide; Nitrosylation; Cobalt; Supported catalyst; Dispersion; Sulfatation
• ISSN: 0142-2421; 1096-9918
• DOI: 10.1002/sia.1259

Adsorption of NO on cobalt catalysts supported on zirconia and sulphated zirconia results in the formation of three main types of species: Zr4+(SO42−)‐NO and Zr4+(NO3−)‐NO nitrosyls (infrared band at 1940‐1906 cm−1), which are of low stability (temperature‐programmed desorption maximum at 55–80°C); Co2+(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 Con+‐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.