On the initial deactivation of MnxOy–Al2O3 sorbents for high temperature removal of H2S from producer gas

Chytil, Svatopluk; Kure, Milly; Lødeng, Rune; Blekkan, Edd A.

doi:10.1016/j.fuproc.2015.01.044

Cited by 12 publications

(25 citation statements)

References 50 publications

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“…As shown in Fig. 2, the sorption characteristic are quite alike for the Mn15-Al2O3 and Mn15-ZrO2 samples, both showing a typical sorption behavior observed previously for the alumina supported manganese oxides under similar conditions [11,21,22]. The sorption characteristics are also similar for the Mn15-CeO2 and Mn15-TiO2 samples, however the measured H2S concentration profiles depart from the standard behavior as a considerable "pre-breakthrough" concentration is observed.…”

Section: H2s Sorption On Supported Manganese Oxide Sorbentssupporting

confidence: 74%

“…The H2S concentration profile recorded on the sample exhibits a typical sorption behavior as previously observed on the MnxOy-Al2O3 sorbents under similar conditions [11]. The reduced cerium oxide also shows a considerable H2S sorption capacity.…”

Section: H2s Sorption On Parent Supportssupporting

confidence: 74%

“…The second sorption cycle, and also the 7 th and the 12 th cycles, were performed after approx.12 h exposure of the sample to H2 at 650 °C. It was previously observed that this treatment has a significant effect on the performance of the MnxOyAl2O3 sorbents [11]. Here it can be emphasized that the producer gas has a strong reductive character due to the presence of H2, CO and CH4.…”

Section: Mno-support + H2s ↔ Mns-support + H2omentioning

confidence: 87%

“…The set-up is described in detail elsewhere [11]. The gas concentrations are measured continuously by a ThermoStar GSD 320 T1 C analytical system equipped with a quadruple mass spectrometer QMS 200 using a secondary electron multiplier (SEM) or Faraday cup detector.…”

Section: Instrumentationmentioning

confidence: 99%

“…In a recent work, performed with a model producer gas and using MnxOy-Al2O3 sorbents, some performance decay over multiple sorption/regeneration cycles was observed [11]. As it was suggested that the use of alumina may be partly responsible for the deactivation, the use of other supports for the Mn oxide was examined.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

Chytil

Kure

Lødeng

et al. 2017

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Abstract:High temperature H2S sorbents comprising manganese oxide (15 wt. %) supported on TiO2, ZrO2, CeO2 and Al2O3 were prepared by wet impregnation using Mn(NO3)2.4H2O as Mn precursor. Upon activation in H2, the sorbent performance testing was conducted at 650 °C in a model gas mixture with a composition of 0.4 vol. % of H2S in 40 vol. % of H2, the balance being inert gas (N2 and Ar).Sorbent regeneration was performed at 650 °C with 5.2 vol. % of O2 in N2. The initial sorption performance is first reported for the parent (Mn-free) supports showing a considerable H2S sorption on ZrO2 and CeO2 and a minor sorption on Al2O3 and TiO2. The Mn sorbents were subject to 13 sorption/regeneration cycles. The highest initial sorption capacity is reported for cerium supported Mn oxide, which is also the sample that deactivates most. A prolonged exposure to H2 at 650 °C results in a reversible loss of the sorption capacity that was observed for all the samples except for Mn on zirconia suggesting its superior stability in H2.

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Section: H2s Sorption On Supported Manganese Oxide Sorbentssupporting

confidence: 74%

Section: H2s Sorption On Parent Supportssupporting

confidence: 74%

Section: Mno-support + H2s ↔ Mns-support + H2omentioning

confidence: 87%

Section: Instrumentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

Chytil

Kure

Lødeng

et al. 2017

Fuel

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Effect of Calcination Atmosphere on High Temperature H2S Removal of MnxOy/Al2O3 Sorbent in Synthesis Gas

Liu

et al. 2021

Clean Coal and Sustainable Energy

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Effects of Sulphur on a Co/Mn-based Catalyst for Fischer–Tropsch Reactions

et al. 2018

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The long term effect of up to 10 ppm H2S was studied for Fischer-Tropsch conversion of syngas by catalytic testing at 240 °C, 5 bar, H2/CO = 2.1 and GHSV = 2400 Nml/g,h. Sulphur was dosed after ~300 h or ~1000 h time on stream and the effect was monitored using on-line GC. The activity declined, and the effect correlated to the concentration of H2S in the feed. However, dosing after ~1000 h caused a stronger effect than dosing after ~300 h. The effects of sulphur are significant with respect to operational risks and mitigation but are substantially less severe than for a standard Co-based catalyst operated at 20 bar for wax production. The spent catalyst consisted of a mixture of cubic (Co,Mn)O, hexagonal Co, Co2C and sulphurous deposits; mainly MnSO4. It could not be concluded that sulphur had a direct effect on product selectivity, but it may have impacted water-gas-shift activity, and sudden changes in shift activity was found to correlate to changes in hydrocarbon selectivity.

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On the initial deactivation of MnxOy–Al2O3 sorbents for high temperature removal of H2S from producer gas

Cited by 12 publications

References 50 publications

Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

Performance of Mn-based H2S sorbents in dry, reducing atmosphere – Manganese oxide support effects

Effect of Calcination Atmosphere on High Temperature H2S Removal of MnxOy/Al2O3 Sorbent in Synthesis Gas

Effects of Sulphur on a Co/Mn-based Catalyst for Fischer–Tropsch Reactions

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