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Study on the Key Factors of NO Oxidation Using O₃: The Oxidation Product Composition and Oxidation Selectivity

Author:
Ji, Ruijun, Wang, Jian, Xu, Wenqing, Liu, Xiaolong, Zhu, Tingyu, Yan, Chaoyu, Song, Jianfei
Source:
Industrial & engineering chemistry process design and development 2018 v.57 no.43 pp. 14440-14447
ISSN:
1520-5045
Subject:
carbon monoxide, flue gas, hydrochloric acid, nitrates, nitric oxide, oxidation, ozone, process design, sulfur dioxide, temperature, water vapor, yields
Abstract:
NO oxidation using O₃ is studied, including the product composition under different conditions and the oxidation selectivity in complex flue gas. The O₃/NO molar ratio determines the type of oxidation products. N₂O₅ is generated when the O₃/NO molar ratio is greater than 1, and the N₂O₅ yield increases with the improvement of the O₃/NO molar ratio. High temperature leads to the decomposition of NO₃ and the decrease of the N₂O₅ yield. When NO₃ decomposition is caused in the high-temperature region, the increase of the residence time is not beneficial to the generation of N₂O₅. In addition, water vapor in the flue gas is beneficial to the formation of N₂O₅ at low temperatures (60–90 °C), but SO₂, CO, and HCl in the flue gas show little influence on the NO oxidation selectivity.
Agid:
6194373