Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (3): 20250313.doi: 10.7503/cjcu20250313

• Physical Chemistry • Previous Articles     Next Articles

Theoretical Study on the Mechanism of Atmospheric New Particle Formation Enhanced by Formic Sulfide Anhydride in Atmosphere

LI Xinxin1, AN Guoce2, SONG Xiaoming1, NI Shuang1(), BAI Fengyang1(), PAN Xiumei3, ZHAO Zhen1,4   

  1. 1.School of Chemistry and Chemical Engineering,Institute of Catalysis for Energy and Environment,Shenyang Normal University,Shenyang 110034,China
    2.College of Forensic Science and Technology,Criminal Investigation Police University of China,Shenyang 110035,China
    3.School of Chemistry,National and Local Joint Key Laboratory of Power Batteries,Northeast Normal University,Changchun 130024,China
    4.State Key Laboratory of Heavy Oil,College of Science,China University of Petroleum,Beijing 102249,China
  • Received:2025-10-27 Online:2026-03-10 Published:2025-12-01
  • Contact: NI Shuang E-mail:nis223@nenu.edu.cn;baify492@nenu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22476134);the Natural Science Foundation of Liaoning Province, China(2024-BS-106);the Basic Scientific Research Foundation Project of Liaoning Province, China(JYTQN2023419);the National Innovation and Entrepreneurship Training Program for College Students, China(202410166005)

Abstract:

Sulfur trioxide(SO3) and formic acid(FA) rapidly react to form formic sulfuric anhydride(FSA). Compared with sulfuric acid(SA), a well-established nucleation precursor, FSA exhibits lower saturation vapor pressure and a greater number of intermolecular interaction sites, suggesting its potential contribution to atmospheric new particle formation(NPF). However, its nucleation capability remains unclear. This study employs density functional theory to evaluate the nucleation potential of FSA with 62 common atmospheric species, and compares it with that of its parent compound formic acid and the typical nucleation precursor sulfuric acid, thereby comprehensively assessing FSA’s potential role in NPF and its atmospheric implications. The results indicate that FSA can spontaneously form dimers with common atmospheric monomers, and proton transfer occurs within dimer clusters formed with 18 amine-containing compounds. Among these, the FSA-monoethanolamine(MEA) dimer exhibits the most negative ΔG value, indicating that MEA possesses the strongest ability to promote initial nucleation of FSA. Furthermore, based on the most stable clusters(FSA-MEA, FA-MEA, and SA-MEA), the hydration behavior and hygroscopicity of these dimers were investigated. It was found that cluster stability increases with the number of water molecules(n=0—6). Under varying humidity conditions, the sensitivity of dimer hydrates to humidity follows the order: SA-MEA>FSA-MEA>FA-MEA. As cluster size increases, both the isotropic mean polarizability and Rayleigh scattering intensity increase linearly, in the order: FSA-MEA> SA-MEA>FA-MEA. This suggests that FSA-MEA has a stronger capacity to enhance the light extinction properties of atmospheric aerosols than FA-MEA and SA-MEA, thereby exerting a more adverse impact on atmospheric visibility.

Key words: Formic acid thionic anhydride, Dimer, Atmospheric aerosol, Hydrated clusters, Nucleation capacity

CLC Number: 

TrendMD: