Thermal Decomposition of 2-Cyclopentenone

Area of Science:

• Chemical Kinetics
• Combustion Chemistry
• Biomass Pyrolysis

Background:

• 2-Cyclopentenone is a cyclic oxygenated hydrocarbon relevant to biomass pyrolysis.
• Understanding its thermal decomposition is crucial for biomass conversion processes.

Purpose of the Study:

• To investigate the gas-phase thermal decomposition pathways of 2-cyclopentenone.
• To identify the primary decomposition products and reaction mechanisms.

Main Methods:

• Experimental pyrolysis in a pulsed microtubular reactor (1000–1400 K).
• Product identification using Fourier-transform infrared (FTIR) spectroscopy and argon matrix isolation.
• Computational chemistry for theoretical pathway analysis.

Main Results:

• Identified products include carbon monoxide, ketene, propenylketene, vinylacetylene, ethylene, propene, acrolein, acetylene, propyne, and propargyl radical.
• Computational analysis revealed five distinct decomposition pathways, including H atom migration and C-C bond rupture.
• A pathway forming a high-energy cyclopropenone intermediate was identified, leading to ethylene, acetylene, and CO.

Conclusions:

• The study elucidates the complex thermal decomposition of 2-cyclopentenone.
• Multiple reaction channels contribute to product formation, providing insights into biomass pyrolysis mechanisms.
• Computational modeling complements experimental data, offering a comprehensive understanding of the decomposition landscape.