Thermodynamic Possibilities of Producer Gas Desulfurization and Dechlorination by Ce, La, and Mn Based Solid Sorbents and Regeneration of Sorbents after Sulfidation

0429229 - ÚCHP 2015 SK eng C - Konferenční příspěvek (zahraniční konf.)
Svoboda, Karel - Hartman, Miloslav - Chyou, Y.-P. - Kameníková, Petra - Pohořelý, Michael - Šyc, Michal
Thermodynamic Possibilities of Producer Gas Desulfurization and Dechlorination by Ce, La, and Mn Based Solid Sorbents and Regeneration of Sorbents after Sulfidation.
Proceedings. Bratislava: AXIMA Graphics Design & Printing Services, 2014 - (Markoš, J.), s. 57. ISBN 978-80-89475-13-1.
[International Conference of Slovak Society of Chemical Engineering /41./. Tatranské Matliare (SK), 26.05.2014-30.05.2014]
Institucionální podpora: RVO:67985858
Klíčová slova: gasification * producer gas * desulfurization
Kód oboru RIV: CI - Průmyslová chemie a chemické inženýrství

The medium and high temperature (500 – 1100 K) methods of acid gas components removal from producer gas (syngas) rely usually on zinc and copper based solid sorbents. Such sorbents suffer from low ability of removal of organic sulfur compounds (e.g. thiophene), interferences caused by presence of HCl in cleaned gas and in difficult sorbent regeneration. Because cerium oxides (CexOy), lanthanum oxide (La2O3) and manganese oxide (MnO) based solid sorbents have been recognized to be suitable candidates for deep removal of sulfur compounds from producer gas and for possible regeneration and multiple sorption/regeneration cycles, we have studied thermodynamics and equilibria for the removal of H2S, COS and thiophene from model syngas and possible regeneration of sorbents by means of SO2 and water vapour with accent on possible formation of elemental sulfur during the sorbent regeneration step. The results on theoretical attainable sulfur compounds concentrations by means of such sorbents are compared with a ZnO based sorbent. The theoretical equilibria suggest that at high temperatures (over approx. 900 K) the lanthanum oxide based sorbents are the most efficient in H2S and COS removal. The attainable equilibrium H2S concentrations are lower than for ZnO sorbents. The cerium based sorbents (Ce2O3 and the non-stoichiometric oxides CexOy) are slightly less suitable. CeO2 must be reduced prior to the reaction with sulfur compounds, because the desulfurization equilibria are much less advantageous.
Trvalý link: http://hdl.handle.net/11104/0234370