Fabrication and Fractality of Fe2O3-CeO2/ZSM-5 Composites for High-Temperature Desulfurization

Abstract

Fe 2 O 3 /ZSM-5 modified with Ce via citrate route (sol-gel approach) is applied for H 2 S removal in 500-700 • C temperature range. The sulfidation activity of Fe 2 O 3 /ZSM-5 is appreciably promoted by introduction of Ce plausibly attributed to the synergy of Fe 2 O 3 and CeO 2 . 5Fe5Ce/ZSM-5 performs the optimal desulfurization behavior at 600 • C with sulfur capacity of 1020 µmol S/g, and the sulfidation process conforms to non-catalytic gas-solid redox reaction mechanism, which yields FeS 2 , Ce 2 S 3 , and S. Fractal analysis is introduced to evaluate the surface porous structure and the adsorption capacity of the sorbent. Its surface fractal dimension is estimated by using Frenkel-Halsey-Hill (FHH) model. It considerably increases after sulfidation plausibly attributed to the formation of a few heterogeneous sulfides or elemental sulfur, which block or cover the surface pore structures of sorbents.

Oxidation of Carbon Monoxide on Co−Ce‐Modified ZSM‐5 Zeolites: Impact of Mixed Oxo‐Species

“…It was assumed that there are joint “Fe,Ce‐oxo” cations with Fe−O−Ce bridges in Fe−Ce−ZSM‐5 . It is known that the oxides deposited on the surface of a zeolite can interact and exhibit a synergistic effect . Bin et al .…”