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MCM-41 support to ultrasmall γ-Fe2O3 nanoparticles for H2S removal

Abstract

MCM-41 is proposed to build mesostructured Fe2O3-based sorbents as an alternative to other silica or alumina supports for mid-temperature H2S removal. MCM-41 was synthesized as micrometric (MCM41_M) and nanometric (MCM41_N) particles and impregnated through an efficient Two-Solvents (hexane-water) procedure to obtain the corresponding γ-Fe2O3@MCM-41 composites. The active phase is homogeneously dispersed within the 2 nm channels in form of ultrasmall maghemite nanoparticles assuring a high active phase reactivity. The final micrometric (Fe_MCM41_M) and nanometric (Fe_MCM41_N) composites were tested as sorbents for the hydrogen sulphide removal at 300 °C and the results were compared with a reference sorbent (commercial unsupported ZnO) and an analogous silica-based sorbent (Fe_SBA15). MCM-41 based sorbents, having the highest surface areas, showed superior performances that were retained after the first sulphidation cycle. Specifically, the micrometric sorbent (Fe_MCM41_M) showed a higher SRC value than the nanometric one (Fe_MCM41_N), due to the low stability over time of the nanosized particles caused by their high reactivity. Furthermore, the low regeneration temperature (300-350 °C), besides the high removal capacity, render MCM41-based systems an alternative class of regenerable sorbents for thermally efficient cleaning up processes in Integrated Gasification Combined Cycles (IGCC) systems.

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Publication details

The article was received on 27 Apr 2017, accepted on 07 Jul 2017 and first published on 08 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA03652C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    MCM-41 support to ultrasmall γ-Fe2O3 nanoparticles for H2S removal

    C. Cara, E. Rombi, A. Musinu, V. Mameli, A. Ardu, M. Sanna Angotzi , L. Atzori, D. Niznansky, H. L. Xin and C. Cannas, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03652C

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