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Direct reduction of sulfur dioxide to elemental sulfur with hydrogen over Sn-Zr-based catalysts / Gi Bo Han in Industrial & engineering chemistry research, Vol. 47 n°14 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4658–4664 Titre : Direct reduction of sulfur dioxide to elemental sulfur with hydrogen over Sn-Zr-based catalysts Type de document : texte imprimé Auteurs : Gi Bo Han, Auteur ; No-Kuk Park, Auteur ; Suk Hoon Yoon, Auteur ; Tae Jin Lee, Auteur Année de publication : 2008 Article en page(s) : p. 4658–4664 Note générale : Bibliogr. p. 4664 Langues : Anglais (eng) Mots-clés : Sulfur  dioxide;  Redox  mechanism;  Conversion Résumé : We conducted the SO2 reduction with H2 over Sn−Zr-based catalysts for the direct sulfur recovery process. The reaction temperature was varied from 250 to 550 °C while using SnO2-only, ZrO2-only, and SnO2−ZrO2 (Sn/Zr = 2/1) catalysts. The highest reactivity was obtained using the SnO2−ZrO2 (Sn/Zr = 2/1) catalyst at 550 °C, for which the SO2 conversion and sulfur selectivity were 98 and 55%, respectively. Also, the following mechanistic pathway was suggested: (1) The elemental sulfur is produced by the direct conversion of SO2 according to the redox mechanism (SO2 + 2H2 → S + 2H2O). (2) The produced sulfur is partially converted into H2S with the hydrogenation (H2 + S → H2S). (3) Finally, the Claus reaction proceeds through Lewis and Brönsted acidic sites (SO2 + 2H2S → 3S + 2H2O). It was estimated that the lattice oxygen vacancies might be active sites for the redox mechanism and the Lewis and Brönsted acidic sites might be related to the pathway of the Claus reaction. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800058v [article] Direct reduction of sulfur dioxide to elemental sulfur with hydrogen over Sn-Zr-based catalysts [texte imprimé] / Gi Bo Han, Auteur ; No-Kuk Park, Auteur ; Suk Hoon Yoon, Auteur ; Tae Jin Lee, Auteur . - 2008 . - p. 4658–4664. Bibliogr. p. 4664 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°14 (Juillet 2008) . - p. 4658–4664 Mots-clés : Sulfur  dioxide;  Redox  mechanism;  Conversion Résumé : We conducted the SO2 reduction with H2 over Sn−Zr-based catalysts for the direct sulfur recovery process. The reaction temperature was varied from 250 to 550 °C while using SnO2-only, ZrO2-only, and SnO2−ZrO2 (Sn/Zr = 2/1) catalysts. The highest reactivity was obtained using the SnO2−ZrO2 (Sn/Zr = 2/1) catalyst at 550 °C, for which the SO2 conversion and sulfur selectivity were 98 and 55%, respectively. Also, the following mechanistic pathway was suggested: (1) The elemental sulfur is produced by the direct conversion of SO2 according to the redox mechanism (SO2 + 2H2 → S + 2H2O). (2) The produced sulfur is partially converted into H2S with the hydrogenation (H2 + S → H2S). (3) Finally, the Claus reaction proceeds through Lewis and Brönsted acidic sites (SO2 + 2H2S → 3S + 2H2O). It was estimated that the lattice oxygen vacancies might be active sites for the redox mechanism and the Lewis and Brönsted acidic sites might be related to the pathway of the Claus reaction. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800058v