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- Title
Research on NH<sub>3</sub>-SCO performance of CoV oxide catalyst prepared by regulation.
- Authors
DU Yali; MIAO Gaiqin; MA Rong; WU Xianfeng; AN Xia; WU Xu
- Abstract
With the rapid development of selective catalytic reduction by ammonia gas (NH3-SCR) technology in industrial flue gas, it is of great significance to develop a catalyst for selective oxidation of escaping ammonia (NH3-SCO) with matching temperature window. Based on the catalytic properties of Co and V metal oxides in the NH3-SCO reaction, this paper attempts to prepare CoV composite oxide catalysts (CoV-MEC, CoV-IMP, CoV-LDO) by using different methods (mechanical assembly, impregnation, hydrotalcite-like template method) to assemble Co and V, and the effect of the synthesis way on the physical and chemical properties and the removal performance of escaping ammonia of the catalysts was systematically evaluated. The results show that CoV oxide catalysts derived from the hydrotalcite-like precursor had larger specific area, richer surface acid content and more suitable redox capacity, showing better N2 selectivity compared with mechanical assembly and impregnation methods. It can better balance NH3 oxidation performance and N2 selectivity in the range of 150-360 °C. NH3 removal efficiency was nearly 100% and N2 selectivity was kept at 70% at 360 °C. Its excellent performance is related to the fact that NH3 adsorbed on its surface can be rapidly oxidized to NO by O2, and the reaction follows the i-SCR mechanism. This work can provide important reference for constructing CoV-based mixed oxides catalysts with excellent performance in applications for NH3-SCO.
- Publication
Journal of Functional Materials / Gongneng Cailiao, 2023, Vol 54, Issue 12, p12076
- ISSN
1001-9731
- Publication type
Article
- DOI
10.3969/j.issn.1001-9731.2023.12.010