科研之友
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摘要
The hot-gas desulfurization process has been developed for the selective removal of sulfur contained in synthetic gas produced by coal gasification, which is a form of clean coal technology (CCT). This process is consists of three unit processes: a sulfur-absorption process for hydrogen sulfide and carbonyl sulfide etc., a regeneration process for the oxidation of metal sulfide sorbents to metal oxide, and a sulfur recovery process for the catalytic reduction of SO2 exhausted in the regeneration process to elemental sulfur. In this study, the activity of Cu-Sn-Zr-based catalysts for the direct sulfur recovery process, which was developed to convert sulfurdioxide exhausted in the regenerator of the hot-gas desulfurization process to elemental sulfur, were investigated in the presence of water vapor. The lattice oxygen vacancies formed in SnO2 by the reduction of SnO2 with CO can also be reoxidized by water vapor. Therefore, the activity of the Sn-Zr-based catalyst decreased due to the decrease in the number of lattice oxygen vacancies on SnO2 used as the active sites for SO2 catalytic reduction by a redox mechanism. On the other hand, the effects of water vapor for SO2 catalytic reduction could be reduced by a COS intermediate mechanism over the Cu-Sn-Zr-based catalysts. Water vapor was not reacted as an oxidizer on the COS intermediate mechanism and the catalytic deactivation by the adsorption of water molecules was reduced remarkably under the pressure conditions.
- 出版日期2017-11
