AI Article Synopsis
- * This study introduces a nitrogen-rich carbon catalyst created from polyaniline that effectively oxidizes HS at a low temperature of 180 °C.
- * The high efficiency of this catalyst (99% conversion rate and 95% selectivity) is due to the formation of active pyridine-N sites that enhance the absorption and breakdown of HS molecules.
Article Abstract
The efficient removal of hydrogen sulfide (HS) from exhaust emissions is a great challenge to chemical industries. Selective catalytic oxidation of HS into elemental sulfur is regarded as one of the most promising approaches to alleviate environmental pollution, while recycling sulfur resources. It is therefore highly desirable to develop efficient catalysts for the conversion of HS to sulfur under mild reaction conditions. Here we present a nitrogen-rich carbon obtained by the direct thermal treatment of commercial polyaniline (PANI) for the selective oxidation of HS in a continuous way at relatively low temperature (180 °C). The efficient conversion of HS over the N-rich carbon catalysts was attributed to the in situ generation of pyridine-N on the carbon matrix, which served as the active sites to promote the absorption and dissociation of HS molecules, achieving a superior catalytic conversion rate of 99% and selectivity up to 95% at 180 °C.
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