Synergistic effect of F and triggered oxygen vacancies over F-TiO2 on enhancing NO ozonation |
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| Affiliation: | 1. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling (Anhui University of Technology), Ministry of Education, Ma''anshan 243002, China;2. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;3. Donadeo Innovation Centre of Engineering, University of Alberta, Edmonton T6G 1H9, Canada |
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| Abstract: | ![]()
Oxidation-absorption technology is a key step for NOx removal from low-temperature gas. Under the condition of low O3 concentration (O3/NO molar ratio = 0.6), F-TiO2 (F-TiO2), which is cheap and environmentally friendly, has been prepared as ozonation catalysts for NO oxidation. Catalytic activity tests performed at 120°C showed that the NO oxidation efficiency of F-TiO2 samples was higher than that of TiO2 (about 43.7%), and the NO oxidation efficiency of F-TiO2-0.15 was the highest, which was 65.3%. Combined with physicochemical characteristics of catalysts and the analysis of active species, it was found that there was a synergistic effect between F sites and oxygen vacancies on F-TiO2, which could accelerate the transformation of monomolecular O3 into multi-molecule singlet oxygen (1O2), thus promoting the selective oxidation of NO to NO2. The oxidation reaction of NO on F-TiO2-0.15 follows the Eley-Rideal mechanism, that is, gaseous NO reacts with adsorbed O3 and finally form NO2. |
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| Keywords: | Corresponding authors. Nitrogen oxides Catalytic ozonation Singlet oxygen Synergistic effect Reaction mechanism |
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