Thermodynamics Possibilities and Constraints for the Regeneration of Spent Solid H2S Sorbents Based on Ce-, La-, and Zn-Oxides.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F16%3A00462391" target="_blank" >RIV/67985858:_____/16:00462391 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Thermodynamics Possibilities and Constraints for the Regeneration of Spent Solid H2S Sorbents Based on Ce-, La-, and Zn-Oxides.

Popis výsledku v původním jazyce

The thermodynamic analyses are focused on suitable ways and conditions for regeneration of spent desulfurization sorbents from dry cleaning of producer gas in a temperature range 600 – 1200 K. Three sulfidic compounds (ZnS, Ce2O2S and La2O2S) were considered for regeneration to the corresponding oxides or oxy-carbonates by mild oxidation, reaction with SO2 and reaction with water vapour and CO2. Zinc sulfide can be regenerated practically only by mild oxidation either at O2/ZnS molar ration around 1.5 at temperatures between approx. 950 and 1050 K or at temperatures over 1200 K at higher O2/ZnS molar ratios. The temperature of regeneration higher than approx. 1100 K causes sintering/changes of sorbent texture. The Ce2O2S-based spent cerium sorbents are advantageously regenerated by reaction with SO2 at temperatures over 700 K (between 700 and 900 K). In this way CeO2, elemental sulfur and small concentrations of S2O are theoretically produced. If the spent Ce-sorbent contains also Ce-halides (e.g. CeCl3) , they are not decomposed by reaction with SO2. The La-based spent sulfur sorbents are restored by reaction with CO2 and H2O vapor leading to formation of La2O2CO3 and H2S. The suitable operating conditions involve temperatures between 700 and 800 K and higher operating pressures (above 1 MPa). The regeneration of La2O2S by simple oxygen oxidation is complicated by formation of very stable oxy-sulfate La2O2SO4.

Název v anglickém jazyce

Thermodynamics Possibilities and Constraints for the Regeneration of Spent Solid H2S Sorbents Based on Ce-, La-, and Zn-Oxides.

Popis výsledku anglicky

The thermodynamic analyses are focused on suitable ways and conditions for regeneration of spent desulfurization sorbents from dry cleaning of producer gas in a temperature range 600 – 1200 K. Three sulfidic compounds (ZnS, Ce2O2S and La2O2S) were considered for regeneration to the corresponding oxides or oxy-carbonates by mild oxidation, reaction with SO2 and reaction with water vapour and CO2. Zinc sulfide can be regenerated practically only by mild oxidation either at O2/ZnS molar ration around 1.5 at temperatures between approx. 950 and 1050 K or at temperatures over 1200 K at higher O2/ZnS molar ratios. The temperature of regeneration higher than approx. 1100 K causes sintering/changes of sorbent texture. The Ce2O2S-based spent cerium sorbents are advantageously regenerated by reaction with SO2 at temperatures over 700 K (between 700 and 900 K). In this way CeO2, elemental sulfur and small concentrations of S2O are theoretically produced. If the spent Ce-sorbent contains also Ce-halides (e.g. CeCl3) , they are not decomposed by reaction with SO2. The La-based spent sulfur sorbents are restored by reaction with CO2 and H2O vapor leading to formation of La2O2CO3 and H2S. The suitable operating conditions involve temperatures between 700 and 800 K and higher operating pressures (above 1 MPa). The regeneration of La2O2S by simple oxygen oxidation is complicated by formation of very stable oxy-sulfate La2O2SO4.

Druh

D - Stať ve sborníku

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

<a href="/cs/project/GC14-09692J" target="_blank" >GC14-09692J: Čištění plynu z fluidního zplyňování uhlí s biomasou pro využití v pokročilých technologiích</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings

ISBN

1-890977-33-0

ISSN

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e-ISSN

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Počet stran výsledku

11

Strana od-do

1-11

Název nakladatele

University of Pittsburgh

Místo vydání

Cape Town

Místo konání akce

Cape Town

Datum konání akce

8. 8. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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