Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 260, Issue -, Pages 104-111Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2013.05.008
Keywords
Alumina-intercalated clay; H2S selective oxidation; Sulfur yield; Sulfur selectivity; Catalyst deactivation
Categories
Funding
- National High Technology Research and Development Program of China [2012AA063101]
- National Basic Research Program of China [2010CB732300]
- National Natural Science Foundation [20725723, 21007082]
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A series of iron oxide supported on alumina-intercalated clay catalysts (named Fe/Al-Lap catalysts) with mesoporous structure and high specific surface area were prepared. The structural and chemical properties were studied by nitrogen sorption isotherms, X-ray diffraction (XRD), UV-vis diffuse reflectance spectra (UV-vis DRS), X-ray photoelectron spectra (XPS), Fourier transform infrared spectroscopy (FTIR), H-2 temperature-programmed reduction (H-2-TPR) and NH3 temperature-programmed desorption (NH3-TPD) techniques. It was realized that iron oxide mainly existed in the form of isolated Fe3+ in an oxidic environment. Fe/Al-Lap catalysts showed high catalytic activities in the temperature range of 120-200 degrees C without the presence of excessive O-2. This can be attributed to the interaction between iron oxide and alumina, which improve the redox property of Fe3+ efficiently. In addition, the strong acidity of catalysts and good dispersion of iron oxide were also beneficial to oxidation reaction. Among them, 7% Fe/Al-Lap catalyst presented the best catalytic performance at 180 degrees C. Finally, the catalytic and deactivation mechanisms were explored. Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
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