Interferences and Thermodynamic Limits for Producer Gas Desulfurization, de-HCL and de-HF by Ba, Ce and La-based Sorbents

0444793 - ÚCHP 2016 RIV SK eng O - Ostatní výsledky
Svoboda, Karel - Brynda, Jiří - Hartman, Miloslav - Chyou, Y.P. - Pohořelý, Michael - Skoblia, S. - Šyc, Michal - Kameníková, Petra
Interferences and Thermodynamic Limits for Producer Gas Desulfurization, de-HCL and de-HF by Ba, Ce and La-based Sorbents.
2015
Grant CEP: GA ČR GC14-09692J
Grant ostatní: NSC(TW) 103-2923-E-042A-001 -MY3
Institucionální podpora: RVO:67985858
Klíčová slova: gasification * producer gas * desulfurization
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství

We have focused in our study on thermodynamic analyses of gas desulfurization process (removal of H2S) by selected solid sorbents (BaO/BaCO3, CexOy , La2O3) and comparison with ZnO-based sorbents. In the case of hydrogen-halides we have studied sorption thermodynamics, equilibria and interferences in H2S sorption by BaO/BaCO3, Ce, La and ZnO-based sorbents caused by presence of HCl and HF in the gas. The results indicate that the best sorbent for sulfur compounds at temperatures between 800 K and 1000 K is La2O3. Efficiency of CexOy based sorbents is sensitive to reduction conditions, and temperature. The promising Ba-based sorbents are dependent on appropriate solid solution form stabilizing BaO for its sorption applications. The La2O3 and CexOy based sorbents suffer from significant interferences caused by higher concentrations of HCl and HF in gas at temperatures below approx.. 900 K. The upstream deep removal of HCl (HF) from producer gas by alkaline/alkaline earth-based sorbents in any case contributes to a more efficient and selective downstream sorption of sulfur compounds by the CexOy and La2O3 based sorbents.
Trvalý link: http://hdl.handle.net/11104/0247271