Catalytic O2-steam gasification of biomass over Fe2-xMnxO3 oxides supported on ceramic foam filters

Ruivo, L.C.M.; Gomes, Helena; Lopes, Daniela; Yaremchenko, A.A.; Vilas-Boas, Catarina; Tarelho, L.A.C.; Frade, J.R.

doi:10.1016/j.fuel.2022.124566

Cited by 7 publications

(3 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the authors also used a representative composition of producer gas to confirm its upgrading with enhanced conversion of CO and increased yield of H 2 at up to 700 • C. In this temperature range, one may even seek a contribution of Fe-based catalysts to promote tar conversion, possibly relying on additions of other elements, such as Ni [52]. Sulphur tolerance is also expected based on the demonstrated ability of calcium ferrites to capture H 2 S [23], and also taking into account guidelines for other Fe-based catalysts [2,53].…”

Section: Prospective Applicability To Upgrade Producer Gasesmentioning

confidence: 99%

“…Thermal conversion of lignocellulosic biomass by gasification can be an important contribution to the carbon-neutral economy since producer gas mixtures may be used as commodities for other industrial applications. Though the biomass-derived gas is greatly influenced by process conditions, the typical H 2 :CO molar ratio is often lower than 1:1 [1], even after biomass steam gasification [2]. Consequently, depending on the end-use application (i.e., methanation), the contents of H 2 in the producer gas must be upgraded by water gas shift (WGS) reaction.…”

Section: Introductionmentioning

confidence: 99%

“…The range of the steam to carbon monoxide ratio H 2 O:CO cannot be directly taken from the reported composition of producer gas, which is measured after condensation of steam and, thus, reported on a dry basis [1]. Nevertheless, one predicts approximate values for the concentration of steam and H 2 O:CO in the producer gas before condensation, by combining typical values of the H:C elemental ratio in the biomass feedstock (H : C) biom ≈ 1.5 [1] with the additional contribution of the steam:carbon ratio added to assist gasification (S : C) gas ≥ 0.5 [2]; this yields the effective ratio (H : C) e f f ≈ (H : C) biom 1 + 2(S : C) gas ≥ 2.5, and on combining with elemental balances of H and C in reported producer gas compositions (e.g., ref. [2]), one expects H 2 O:CO in the range 1-2 depending on temperature and other operating conditions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ca2Fe2O5-Based WGS Catalysts to Enhance the H2 Yield of Producer Gases

Antunes,

Ruivo,

Tarelho

et al. 2023

Catalysts

Self Cite

View full text Add to dashboard Cite

Ca2Fe2O5-based catalysts were synthesized from siderite and calcite precursors, which were processed in the form of pelletized samples and tested as water gas shift catalysts. Catalytic tests were performed in a tubular reactor, at temperatures in the range 400–500 °C and with different H2O:CO ratios, diluted with N2; this demonstrates the positive impact of Ca2Fe2O5 on conversion of CO and H2 yield, relative to corresponding tests without catalyst. The catalytic performance was also remarkably boosted in a microwave-heated reactor, relative to conventional electric heating. Post-mortem analysis of spent catalysts showed significant XRD reflections of spinel phases (Fe3O4 and CaFe2O4), and SiO2 from the siderite precursor. Traces of calcium carbonate were also identified, and FTIR analysis revealed relevant bands ascribed to calcium carbonate and adsorbed CO2. Thermodynamic modelling was performed to assess the redox tolerance of Ca2Fe2O5-based catalysts in conditions expected for gasification of biomass and thermochemical conditions at somewhat lower temperatures (≤500 °C), as a guideline for suitable conditions for water gas shift. This modelling, combined with the results of catalytic tests and post-mortem analysis of spent catalysts, indicated that the O2 and CO2 storage ability of Ca2Fe2O5 contributes to its catalytic activity, suggesting prospects to enhance the H2 content of producer gases by water gas shift.

show abstract