Catalytic reduction of sulfur dioxide with carbon monoxide over tin dioxide for direct sulfur recovery process.
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.
Han
Gi Bo
GB
National Research Laboratory, School of Chemical Engineering & Technology, Yeungnam University, 214-1 Dae-dong, Gyeongsan-si, Gyeongsangbuk-do 712-749, Republic of Korea.
Park
No-Kuk
NK
Yoon
Suk Hoon
SH
Lee
Tae Jin
TJ
D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D010084:Oxidation-Reduction; D013455:Sulfur / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000737:chemistry*; D017971:Tin Compounds / Q000737:chemistry*
D017971:Tin Compounds; D013458:Sulfur Dioxide; D013455:Sulfur; D002248:Carbon Monoxide; C045358:stannic oxide