Study of the reaction of high-temperature H 2S decomposition on metal oxides ( γ-Al 2O 3, α-Fe 2O 3,V 2O 5)

• Published in: International journal of hydrogen energy Vol. 27; no. 4; pp. 387 - 394
• Main Authors: Reshetenko, T.V., Khairulin, S.R., Ismagilov, Z.R., Kuznetsov, V.V.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 2002
• Subjects: Decomposition; Hydrogen; Hydrogen sulfide; Metal oxide catalysts; Hydrogen sulfide; Hydrogen; Decomposition; Metal oxide catalysts
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/S0360-3199(01)00143-4

Experimental study of the reaction of heterogeneous decomposition of the hydrogen sulfide on bulk oxides γ-Al 2O 3, α-Fe 2O 3 and V 2O 5 in the interval of temperatures 500–900°C have been performed. Reaction orders by H 2S for γ-Al 2O 3 and V 2O 5 are 2.0, and for α-Fe 2O 3 — 2.6; effective activation energies are respectively 72, 94 and 103 kJ/ mol . Using the ESDR and XRD methods, it is shown that in the course of hydrogen sulfide decomposition reaction, the reduction of transition metal oxide catalysts ( α-Fe 2O 3 and V 2O 5) and also the formation of sulfides under the influence of reaction media proceed. Interaction of hydrogen sulfide with aluminum oxide at low temperatures leads to formation of adsorbed species of H 2S as fragments HS − and S 2−, which upon heating 100–700°C transfer into different species of sulfur: c-S 8, c-S 12, S 4. In separate experiments it was demonstrated that the higher the temperature of H 2S interaction with Al 2O 3, the larger number of adsorbed sulfur species are observed in the spectra. Molecular hydrogen sulfide interacts with the Al 2O 3 surface with formation compounds of sulfur with oxygen, which later transform into the final reaction product — elemental sulfur.