Removal of SO2 over Binary Nb/Fe Mixed Oxide Catalysts

The reduction of SO2 to elemental sulfur by CO over a series of iron niobate with nominal Nb/Fe atomic ratios of 1/0, 10/1, 5/1, 1/1, 1/5, 1/10 and 0/1 was studied with a flow fixed-bed reactor. Strong synergistic phenomena in catalytic activity and selectivity were observed for the iron niobate catalysts, and the best catalytic performance was observed for the catalyst with Fe/Nb atomic ratio of 1/1. The active phase of the activated iron niobate catalysts was identified to be FeS2 using XRD and XPS. Selective reduction of SO2 by CO was followed by the COS intermediate mechanism. Key W ord: Nb/Fe mixed oxide, XRD, XPS, Carbon monoxide, Sulfur dioxide, Selective reduction, COS intermediate mechanism. CLEAN TECHNOLOGY, Vol. 12, No. 2., June 2006, pp. 87~94.

[1]  Zhang Zhaoliang,et al.  Separate/simultaneous catalytic reduction of sulfur dioxide and/or nitric oxide by carbon monoxide over TiO2-promoted cobalt sulfides , 2003 .

[2]  V. Kaichev,et al.  XPS study of the silica-supported Fe-containing catalysts for deep or partial H2S oxidation , 2000 .

[3]  T. Gnanasekaran,et al.  Electrical and sensor properties of FeNbO4: a new sensor material , 1999 .

[4]  J. Odriozola,et al.  Preparation and characterization of niobium oxide for the catalytic aldol condensation of acetone , 1999 .

[5]  O. Saur,et al.  Claus catalysis and H2S selective oxidation , 1998 .

[6]  J. Chung,et al.  The catalytic reduction of SO2 to elemental sulfur with H2 or CO , 1997 .

[7]  M. Fang,et al.  The catalytic reduction of SO2 by CO over lanthanum oxysulphide , 1997 .

[8]  J. Chung,et al.  The catalytic reduction of SO 2 to elemental sulfur with H 2 or CO , 1997 .

[9]  P. D. Oliveira,et al.  Niobium oxide based materials as catalysts for acidic and partial oxidation type reactions , 1996 .

[10]  G. Deo,et al.  Redox properties of niobium oxide catalysts , 1996 .

[11]  M. Flytzani-Stephanopoulos,et al.  Reduction of sulfur dioxide by carbon monoxide to elemental sulfur over composite oxide catalysts , 1994 .

[12]  A. Bell,et al.  Raman investigations of NH3 adsorption on TiO2, Nb2O5, and Nb2O5/TiO2 , 1994 .

[13]  W. Stickle,et al.  Handbook of X-Ray Photoelectron Spectroscopy , 1992 .

[14]  K. Tanabe.  Application of niobium oxides as catalysts , 1990 .

[15]  L. Koopal,et al.  Preparation and optical properties of homodisperse haematite hydrosols. , 1986 .

[16]  M. Koizumi,et al.  Magnetic and electrical properties and Mössbauer effect in the solid solution Fe(Nb1−xWx)O4 (0 ⩽ x ⩽ 1) , 1979 .

[17]  S. Khalafalla,et al.  The role of metallic component in the iron-alumina bifunctional catalyst for reduction of SO2 with CO , 1972 .

[18]  S. Khalafalla,et al.  Catalytic Reduction of Sulfur Dioxide on Iron-Alumina Bifunctional Catalysts , 1971 .