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

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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-solvent (hexane–water) procedure to obtain the corresponding γ-Fe2O3@MCM-41 composites. The active phase is homogeneously dispersed within the 2 nm channels in the 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 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 of the nanosized particles over time caused by their high reactivity. Furthermore, the low regeneration temperature (300–350 °C), besides the high removal capacity, renders MCM41-based systems an alternative class of regenerable sorbents for thermally efficient cleaning up processes in Integrated Gasification Combined Cycles (IGCC) systems.

Graphical abstract: MCM-41 support for ultrasmall γ-Fe2O3 nanoparticles for H2S removal

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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, Advance Article
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    MCM-41 support for 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, Advance Article , DOI: 10.1039/C7TA03652C

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