Catalytic reduction of sulfur dioxide with carbon monoxide over tin dioxide for direct sulfur recovery process.
Chemosphere
; 72(11): 1744-50, 2008 Aug.
Article
en En
| MEDLINE
| ID: mdl-18565568
ABSTRACT
SO(2) reduction by CO over SnO(2) catalyst was studied in this work. The parameters were the reaction temperature, space velocity (GHSV) and [CO]/[SO(2)] molar ratio. The optimal temperature, GHSV and [CO]/[SO(2)] molar ratio were 550 degrees C, 8000 h(-1) and 2.0, respectively. Under these conditions, the SO(2) conversion and sulfur selectivity were about 78% and 68%, respectively. The following reaction pathway involving two mechanisms was proposed in SO(2) reduction by CO over SnO(2) catalyst in the first step involving Redox mechanism, the elemental sulfur was produced by the mobility of the lattice oxygen between SO(2) and SnO(2) surface. In the second step, COS was formed by the side reaction between elemental sulfur and CO or metal sulfide and CO. In the third step involving COS intermediate mechanism, the abundant elemental sulfur was produced by the SO(2) reduction by COS which was produced in the second step and was more effective reducing agent than CO.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Azufre
/
Dióxido de Azufre
/
Monóxido de Carbono
/
Compuestos de Estaño
Idioma:
En
Revista:
Chemosphere
Año:
2008
Tipo del documento:
Article