School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, Heilongjiang, China; School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, 264209, Shandong, China; Shandong Institute of Shipbuilding Technology, Institute of Shipping Oil Residue and Oily Sewage Clean Technology, Weihai, 264209, Shandong, China.
Weihai Survey Station, China Classification Society, Weihai, 264209, Shandong, China.
Chemosphere. 2022 Nov;307(Pt 2):135830. doi: 10.1016/j.chemosphere.2022.135830. Epub 2022 Aug 6.
Marine engine exhaust emissions are increasingly harmful to the natural environment and human health and must be controlled. A self-synthesized amide (BAD, CHNO) in the laboratory shows a strong absorption capacity of nitric acid and nitrous acid, which may solve the problem that only using chlorine-based oxidant as an absorbent cannot completely absorb or retain NO produced by NO oxidation in previous studies. Based on Multiwfn and VMD (Visual Molecular Dynamics) program calculation, the formation mechanism of hydrogen bonds between BAD with nitric acid and nitrous acid was revealed by electrostatic potential (ESP) analysis and further confirmed by FT-IR (Fourier transform infrared spectroscopy) spectra research. Subsequently, simultaneous removal of SO and NO from simulated flue gas was carried out by using NaClO/BAD as a two-phase composite absorbent, and the maximum removal efficiencies of SO and NO were 98.9% and 86.6%, respectively. The recycling experiments and the engineering experiments showing that NaClO/BAD can solve the problem of absorption of NO, and it can be a promising composite absorbent in wet desulfurization and denitrification of marine engine exhaust gas in practical applications.
船用发动机废气排放对自然环境和人类健康的危害越来越大，必须加以控制。实验室中自行合成的酰胺（BAD，CHNO）对硝酸和亚硝酸具有很强的吸收能力，这可能解决了以往研究中仅使用含氯氧化剂作为吸收剂不能完全吸收或保留 NO 氧化产生的 NO 的问题。基于 Multiwfn 和 VMD（可视化分子动力学）程序计算，通过静电势（ESP）分析揭示了 BAD 与硝酸和亚硝酸之间氢键的形成机制，并通过 FT-IR（傅里叶变换红外光谱）谱研究进一步证实。随后，采用 NaClO/BAD 作为两相复合吸收剂对模拟烟气中的 SO 和 NO 进行同时脱除，SO 和 NO 的最大脱除效率分别为 98.9%和 86.6%。回收实验和工程实验表明，NaClO/BAD 可以解决 NO 的吸收问题，在船用发动机废气的湿法脱硫脱硝实际应用中可能是一种很有前途的复合吸收剂。
