Abstract
The promotion effect of Mo-addition to alumina-supported Mn-based sorbents for high-temperature desulphurization was explored. A series of Mn-based sorbents with fixed Mn-loading and different Mo-loadings were prepared by the wet impregnation method and both fresh and used sorbents were characterized with respect to their physical and chemical properties. The sorbents were active for H2S removal at 600 °C and could be regenerated by oxidation in diluted air. The sorbents were subjected to 10 repeated sorption/regeneration cycles, and some loss of capacity occurred during the cycles. The results show that Mo-addition promotes the Mn-based sulfur sorbent performance both in terms of capacity and stability. Over the range investigated (0–8 wt% Mo added to a 15 wt% Mn sorbent), the improvement increased with an increasing amount of Mo added. The sample with the highest Mo-addition (15Mn8Mo) also retained the capacity best, as over 90% of the capacity remained after 10 sorption-regeneration cycles, in spite of suffering the most from sintering (observed as loss in surface area, increased pore size, and growth in Mn particle size). Characterization of the fresh and used samples using XRD and Raman spectroscopy indicates that a mixed Mn–Mo oxide suggested to be MnMoO4 plays a role in the promotion mechanism. The sorbent, 15Mn8Mo, is suggested to be promising for high-temperature desulphurization of bio-syngas.
Highlights
Biomass gasification and subsequent fuel synthesis is a realistic route to 2nd generation biofuels, which are considered as one of the key al ternatives to fossil fuels and as such can contribute to a solution to the energy crisis [1]
The catalysts applied for methanol synthesis or Fischer-Tropsch synthesis are very sensitive to the sulfur content and require concentrations below 1 ppmv H2S in the feed gas [8,9,10]
In order to investigate the potential of this system, we report on a series of Mn-based sorbents that are syn thesized with various amounts of Mo addition
Summary
Biomass gasification and subsequent fuel synthesis is a realistic route to 2nd generation biofuels, which are considered as one of the key al ternatives to fossil fuels and as such can contribute to a solution to the energy crisis [1]. The produced syngas contains undesired species and contaminants that have severe detrimental effects on downstream equipment and catalysts [2]. The raw syngas produced in the gasifier contains particulate species, tar, sulfur compounds, nitrogen compounds, etc., the types and amounts of which depend strongly on the feedstock, gasification process and conditions [3,4]. A key contaminant in biomass-derived syngas is sulfur, present mainly as hydrogen sulfide and COS. Complete sulfur capture from bio-syngas is necessary for its use as a feedstock for further catalytic conversion
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