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Related Experiment Videos

C2H+H2CO: a new route for formaldehyde removal.

Hao Dong1, Yi-hong Ding, Chia-chung Sun

  • 1State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China.

The Journal of Chemical Physics
|June 11, 2005
PubMed
Summary

The reaction between ethynyl radicals and formaldehyde is a barrier-free H-abstraction process, forming acetylene and formyl radicals. This efficient pathway aids in removing formaldehyde pollution and is significant for combustion and interstellar chemistry.

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Area of Science:

  • Physical Chemistry
  • Theoretical Chemistry
  • Astrochemistry

Background:

  • Formaldehyde (H2CO) is a common pollutant and a key molecule in interstellar chemistry.
  • Ethynyl radical (HC≡C) is a reactive species involved in combustion and astrochemistry.
  • Understanding radical-molecule interactions is crucial for atmospheric and interstellar chemistry models.

Purpose of the Study:

  • To theoretically investigate the reaction mechanism between the ethynyl radical and formaldehyde.
  • To determine the most feasible reaction pathways and their associated energy barriers.
  • To assess the implications of this reaction for formaldehyde removal and interstellar chemistry.

Main Methods:

  • High-level ab initio calculations were employed.

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  • Various computational levels were used, including CCSD(T), MP2, QCISD, and Gaussian-3 (G3).
  • Geometries were optimized and vibrational frequencies were calculated to determine zero-point vibrational energies (ZPVE).

    • Main Results:

    • A barrier-free H-abstraction pathway yielding acetylene (C2H2) and formyl radical (HCO) was identified as the most feasible route.
    • C-addition and O-addition channels leading to propynal (HCCCHO) and an H-atom were found to have small but non-negligible energy barriers.
    • The reaction represents an efficient route for formaldehyde removal and is potentially the fastest radical-H2CO reaction known.

    Conclusions:

    • The title reaction provides an efficient, potentially barrier-free pathway for formaldehyde removal, relevant to combustion processes.
    • The reaction may play a significant role in interstellar chemistry, particularly on ice surfaces, contributing to the formation of molecules like propynal.
    • This study highlights the importance of considering such reactions in atmospheric and astrochemistry models.