Effect of Ferric Oxide on the High-Temperature Removal of Hydrogen Sulfide over ZnO-Fe2O3 Mixed Metal Oxide Sorbent

Abstract

The effect of ferric oxide on the removal of hydrogen sulfide over ZnO-Fez03 mixed metal oxide sorbents and on the oxidative regeneration of sulfided sorbents was investigated. When ferric oxide was added to the zinc oxide, the reduction of ZnO was retarded by interaction of ZnO with ZnFe204. This interaction was confirmed by larger binding energies of Zn 2~312 and Zn 2~112, identified by ESCA, of the ZnO-ZnFe204 sorbent than those of ZnO. Zinc ferrite with a spinel structure yielded not only high H2S removal capacity but also much SO2 generation. A linear increase of SO2 generation was confirmed up t o 50 wt % Fe203. Resulting from the thermal decomposition of H2S over metal sulfides, H2 generation increased with respect to Fez03 according to a quadratic equation. Channeling, caused by sintering during sulfidation, made the flow path of the reactant change and thus pure ZnO sorbent and the sorbent containing 3 wt % Fez0 did not sulfurate completely. Addition of Fez03 prevented surface structural change like sintering of ZnO during sulfidation.

High temperature H2Sremoval over high specific surface area [beta ]-SiC supported iron oxide sorbent Part 2Sulfidation and regeneration

“…The discrepancies between the observed results on SiCsupported sorbent and those reported by Lee et al 5 The sintering of the iron phase during the absorption test has already been reported by Groot,7 who reported that during sulÐdation, even at low temperature, considerable Fig. 3 XRD pattern of the sulÐded iron sorbent after reaction H 2 S at 400 ¡C sintering took place on a carbon support.…”

Gas‐Sensing Properties of Zinc Ferrite Nanoparticles Synthesized by the Molten‐Salt Route

“…In summary, H 2 S reacts with adsorbed O − on ZnFe 2 O 4 and decomposes into gaseous SO 2 and water vapor with releasing electrons. It is worth noting that ZnFe 2 O 4 is known as an absorbent 16 for H 2 S and oxidizes it to SO 2 and H 2 O. Although the exact mechanism for the selectivity toward H 2 S in ZnFe 2 O 4 is not clear, it may be due to its favorable absorption configuration on ZnFe 2 O 4 as compared with the other gases, making it selective toward H 2 S.…”

Development of Fe-based Catalysts for Purification of Coke Oven Gases

“…According to literature data, many metal sulfides M x S y , where M = Na, K, Li, Fe, Co, Ni, Cr, Mo, V and metal oxides M x O y , where M = Fe, Cr, Cu, Mn, V, Ti Mo, Al, Zn are active in H 2 S decomposition reaction [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. When metal oxides are used, the fist step in the process of H 2 S decomposition is the transformation of metal oxide into metal sulfide.…”