High selectivity of H2O2 activation to ·O2– for efficient NO oxidation over Co single-atom catalyst
(
), Weijie Yang()Graphical Abstract
Abstract
NO oxidation with H2O2 as the oxidant is a promising green denitration technology. However, the current metal oxide catalysts still have many disadvantages for this reaction, such as insufficient catalytic activity for H2O2 activation, poor selectivity, and low stability. In this study, we employ atomically dispersed Co anchored on SBA-15 with Co-O4 structure for NO oxidation, which achieves a 90% removal efficiency of NO under low molar ratio of H2O2 to NO (1.56), ultra-low temperature (80 °C), and ultra-high space velocity (720,000 h–1), representing the top-level performance among previously reported catalysts. More interestingly, our work reveals that by taking advantage of the uniform Co-O4 structure, H2O2 is mainly directionally converted into ·O2– at the Co-O4 site, and ·O2– plays a key role for achieving the deep-oxidation of NO to produce NO3–, which is contrast to the previously reports that 1O2 is the main free radical for NO oxidation. This study highlights the great potentials of single-atom catalysts for improving the H2O2 utilization performance for NO oxidation.
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References
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