Journal of Industrial and Engineering Chemistry, Vol.16, No.4, 593-597, July, 2010
Synthesis of metal-oxide pillared montmorillonite clay for the selective catalytic oxidation of H2S
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In the present work, titania-pillared clay (Ti-PILC) and zirconia-pillared clay (Zr-PILC) were synthesized, and their catalytic performance was studied for the selective oxidation of H2S to elemental sulfur. The obtained pillared clays (PILCs) were characterized by X-ray fluorescence spectroscopy (XRF), infrared (FTIR) spectroscopy, BET surface area measurements, X-ray photoelectron spectroscopy (XPS), UV-visdiffuse reflectance spectroscopy (UV-vis-DRS), temperature-programmed desorption of ammonia (NH3-TPD), and thermogravimetric (TG) analysis. The reaction tests were carried out in a continuous flow fixed-bed reactor at temperature ranging from 220 to 300 ℃. The conversion of H2S increased with increasing temperature for all PILCs while the selectivity to SO2 remained almost constant. The good catalytic performance of the metal-oxide pillared clays may be due to the high surface area and the presence of Bronsted and Lewis acid sites.
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