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Carbonic acid anhydride

CAS No.: 124-38-9

  • Molecular Formula: CO₂
  • Molecular Weight: 44.009 g/mol

Chemical type

  • Primary feedstock
Cite 1
  • Combustion product
  • Greenhouse gas
  • Non-reactive diluent in flames
Cite 2

Key properties

  • Highly thermodynamically stable molecule
  • Linear structure with strong C=O bonds (bond dissociation energy ≈ 799 kJ/mol)
  • Carbon is in the highest oxidation state (+4)
Cite 1
  • Contributes to global radiation balance and climate change
  • Forms ozone, secondary organic aerosols, and photochemical smog
  • Raman Q-branch transitions at 1285 cm⁻¹ and 1388 cm⁻¹ due to Fermi resonance between symmetric stretching mode (v₁) and first overtone of bending mode (2v₂)
  • Vibrational period (τ_vib) of 24.15 fs for the 1388 cm⁻¹ bandhead
  • Present in diesel exhaust as a major component
Cite 2
  • Renewable carbon source for chemical synthesis
  • Reactant in hydrogenation, reforming, and non-reductive conversion reactions
  • Feedstock for producing fuels, bulk chemicals, and polymers
Cite 1
  • Diluent in H₂/air flat-flame (seeded at 7% mole fraction in reactants)
  • Emission component in diesel engines and biofuels
  • Target for in-situ species detection and spectral suppression in combustion diagnostics using fs/ps CARS
Cite 2

Classification by use

  • Chemicals used as carbon feedstocks
  • Chemicals used to synthesize fuels and commodity chemicals
Cite 1
  • Emissions from transportation sector (e.g., diesel vehicles)
  • Species in complex combustion mixtures for spectroscopic analysis
  • Pollutants in aftertreatment systems (sensitive to catalyst poisoning)
Cite 2

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  1. [Cite 1] Recent progress in microporous membrane reactors for catalytic conversion CO2 into value-added chemicals, Advanced Membranes, Volume 7, June 2026, 100190
  2. [Cite 2] Coherent control for species selectivity in a flat-flame using femtosecond/picosecond coherent Raman scattering, Applications in Energy and Combustion Science, Volume 25, March 2026, 100443