Thermodynamic aspects of gasification derived syngas desulfurization, removal of hydrogen halides and regeneration of spent sorbents based on La2O3/La2O2CO3 and cerium oxides

Svoboda, Karel; Leitner, J.; Havlica, Jaromír; Hartman, Miloslav; Pohořelý, Michael; Brynda, Jiří; Šyc, Michal; Chyou, Yau-Pin; Chen, Po-Chuang

doi:10.1016/j.fuel.2016.12.035

Cited by 14 publications

(8 citation statements)

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“…[15] The high versatility of the La-based systems can be exploited in the preparation of mixed oxides and/or composites, where the coupling of the La-based materials with a narrow semiconductor can be a performing strategy to enhance the photoactivity under solar irradiation. Moreover, the high sorbent properties of the La-based compounds (especially of the lanthanum carbonates [16] ) improved the adsorption of the pollutants on the surface of the photocatalyst promoting the photocatalytic degradation. [17][18][19] For these reasons we have synthesized the La 2 O 2 CO 3 material and we have investigated its interaction with the WO 3 , whose low bandgap (about 2.5-2.6 eV) and bands position make it particularly suitable for the photo-oxidation reactions.…”

Section: Introductionmentioning

confidence: 99%

“…The high versatility of the La‐based systems can be exploited in the preparation of mixed oxides and/or composites, where the coupling of the La‐based materials with a narrow semiconductor can be a performing strategy to enhance the photoactivity under solar irradiation. Moreover, the high sorbent properties of the La‐based compounds (especially of the lanthanum carbonates [16] ) improved the adsorption of the pollutants on the surface of the photocatalyst promoting the photocatalytic degradation [17–19] …”

Section: Introductionmentioning

confidence: 99%

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Removal of Phthalates from Water by Unconventional La‐based/WO₃ Photocatalysts

et al. 2022

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La 2 O 2 CO 3 -WO 3 composites were here proposed as unconventional photocatalysts for the removal of phthalates in water. The high sorption properties of the lanthanum dioxide carbonate allowed a strong adsorption of the phthalates which facilitated the following solar photocatalytic degradation, further boosted by the addition of small amounts of WO 3 (1 wt %). On the contrary, a higher content of WO 3 had a detrimental effect due to the covering of the surface sites of La 2 O 2 CO 3 that inhibited the adsorption process. This double mechanism of strong adsorption-photocatalytic oxidation led, after 6 h of solar irradiation, to 67 % and 63 % dimethyl phthalate and di(2ethylhexyl)phthalate degradation, respectively. The phthalates were degraded to less persistent pollutants that, however, were completely removed after 9 h of irradiation. The La 2 O 2 CO 3 -WO 3 system appears promising for its application in the removal of the emerging contaminants from water.[a] E.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of Phthalates from Water by Unconventional La‐based/WO₃ Photocatalysts

et al. 2022

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“…Despite the stability of lanthanide tungstates under harsh conditions, previous studies have reported that the single phase obtention of the La6−xWO12−y (with y = 1.5x + δ) occurs within a narrow La/W range and out of this region secondary phases as La2O3 and La6W2O15 appear [41,42]. The reaction of rare earth oxides with H2S is thermodynamically favoured and they have been studied as desulfurization sorbents at medium and high temperature [43][44][45]. Subsequently, formation of Nd2O3 could occur in the membrane fabrication process giving rise to the Nd2O2S formation under H2S atmospheres that may cause a loss of the electrochemical and structural properties of the material.…”

Section: Introductionmentioning

confidence: 99%

Chemical stability in H2S and creep characterization of the mixed protonic conductor Nd5.5WO11.25-δ

Escolástico

Stournari

Malzbender

et al. 2018

International Journal of Hydrogen Energy

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The integration of hydrogen permeable membranes in catalytic membrane reactors for thermodynamically limited reactions such as steam methane reforming can improve the per-pass yield and simultaneously produce a high-purity H2 stream. Mixed protonic-electronic materials based membranes are potential candidates for these applications due to their elevated temperature operation, good stability and potentially low cost. However, a specific mechanical behavior and stability under harsh atmospheres is needed to guarantee sufficient lifetime in real-world processes. This work presents the mechanical characterization and a study of the chemical stability under H2S containing atmospheres for the compound Nd5.5WO11.25-δ. Mechanical characterization was performed by micro-indentation and creep measurements in air. Chemical stability was evaluated by XRD and SEM and the effect of the H2S on the transport properties was evaluated by impedance spectroscopy. Under H2S atmospheres, the total conductivity increases at 600 °C and 700 °C. The conductivity increase is attributed to the incorporation of S 2ions in oxide-ion sublattice.

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“…In particular, metal(loid)s can interact and/or interfere, leading to the generation of new species, which may induce remarkable influence on the volatilization of metal(loid)s. At present, to the best of the authors' knowledge, there has been no single study towards the assessment of occurred interferences between metal(loid)s during thermochemical processes. In fact, only a study by K. Svoboda [26] investigated the instantaneous interferences of both HF and HCl on H 2 S sorption. Also, two studies evaluated the effect of interactions on elemental behaviour during coal combustion.…”

Section: Introductionmentioning

confidence: 99%

Possible Interactions and Interferences of Copper, Chromium, and Arsenic during the Gasification of Contaminated Waste Wood

2018

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A considerable proportion (about 64%) of biomass energy is produced from woody biomass (wood and its wastes). However, waste wood (WW) is very often contaminated with metal(loid) elements at concentrations leading to toxicity emissions and damages to facilities during thermal conversion. Therefore, procedures for preventing and/or alleviating the negative impacts of these elements require further development, particularly by providing informative and supportive information regarding the phase transformations of the metal(loid)s during thermal conversion processes. Although it is well known that phase transformation depends on different factors such as elements’ vaporization characteristics, operational conditions, and process configuration; however, the influences of reaction atmosphere composition in terms of interactions and interferences are rarely addressed. In response, since Cu, Cr, and As (CCA-elements) are the most regulated elements in woody biomass, this paper aims to explore the possible interactions and interferences among CCA-elements themselves and with Ca, Na, S, Cl, Fe, and Ni from reaction atmosphere composition perspectives during the gasification of contaminated WW. To do so, thermodynamic equilibrium calculations were performed for Boudouard reaction (BR) and partial combustion reaction (PCR) with temperature ranges of 0–1300 °C and 0–1800 °C, respectively, and both reactions were simulated under pressure conditions of 1, 20, and 40 atm. Refinement of the occurred interactions and interferences reveals that Ni-As interactions generate dominant species As2Ni5 and As8Ni11, which increase the solid–gaseous transformation temperature of As. Moreover, the interactions between Ca and Cr predominantly form C3Cr7; whereas the absence of Ca leads to Cr2Na2O4 causing instability in the Cr phase transformation.

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Thermodynamic aspects of gasification derived syngas desulfurization, removal of hydrogen halides and regeneration of spent sorbents based on La2O3/La2O2CO3 and cerium oxides

Cited by 14 publications

References 53 publications

Removal of Phthalates from Water by Unconventional La‐based/WO₃ Photocatalysts

Removal of Phthalates from Water by Unconventional La‐based/WO₃ Photocatalysts

Chemical stability in H2S and creep characterization of the mixed protonic conductor Nd5.5WO11.25-δ

Possible Interactions and Interferences of Copper, Chromium, and Arsenic during the Gasification of Contaminated Waste Wood

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Thermodynamic aspects of gasification derived syngas desulfurization, removal of hydrogen halides and regeneration of spent sorbents based on La2O3/La2O2CO3 and cerium oxides

Cited by 14 publications

References 53 publications

Removal of Phthalates from Water by Unconventional La‐based/WO3 Photocatalysts

Removal of Phthalates from Water by Unconventional La‐based/WO3 Photocatalysts

Chemical stability in H2S and creep characterization of the mixed protonic conductor Nd5.5WO11.25-δ

Possible Interactions and Interferences of Copper, Chromium, and Arsenic during the Gasification of Contaminated Waste Wood

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Product

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Removal of Phthalates from Water by Unconventional La‐based/WO₃ Photocatalysts

Removal of Phthalates from Water by Unconventional La‐based/WO₃ Photocatalysts