Promotional effect of acetic acid on simultaneous NO and Hg0 oxidation over LaCoO3 perovskite |
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| Affiliation: | 1. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650500, China;2. College of Chemistry and Environmental Engineering, Chongqing Key Laboratory of Environmental Materials & Remediation Technologies, Chongqing University of Arts and Sciences, Chongqing, 402160, China;3. College of Biological and Agricultural Sciences, Honghe University, Mengzi, 661199 Yunnan, China |
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| Abstract: | Acid etching can effectively alter the mineralization properties of perovskite. In this study, LaCoO3 perovskites were etched via acetic acid (1–3 M) and were used to simultaneously catalyze the oxidation of NO and Hg0 in coal-fired flue gas. The results demonstrated the ability of the modified acetic acid to improve the low-temperature activity of LaCoO3 perovskite. The acetic acid could erode or dissolve the La–O surface termination and emerge more Co–O surface termination, changing the pore structure, surface morphology, redox capacity, metal oxidation state, and acid-site strength. These changes on the LaCoO3 perovskite allowed for the low-temperature to simultaneously improve the NO and Hg0 oxidation performances, and the NO reaction temperature was reduced by 25 °C. Moreover, when the concentration of acetic acid exceeded 1 M, part of the active Co ions in the perovskite structure were further dissolved, thereby reducing the NO and Hg0 simultaneous oxidation activity. |
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| Keywords: | Perovskite Acetic acid Simultaneous oxidation Surface |
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