High temperature pyrolysis of formaldehyde in shock waves

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<jats:title>Abstract</jats:title><jats:p>Thermal decomposition of formaldehyde diluted with Ar was studied behind reflected shock waves in the temperature range of 1200–2000 K at total pressures between 1.3 and 3.0 atm. The study was carried out for compositions from the concentrated mixture, 4% CH<jats:sub>2</jats:sub>O, to the highly dilute mixture, 0.01% CH<jats:sub>2</jats:sub>O by using time‐resolve IR‐laser absorption and IR‐emission, and a single‐pulse technique. From a computer‐simulation study, the mechanism and the rate‐constant expressions that could explain all of our data and previously reported ARAS data were discussed. This data obtained over a wide concentration range from 50 ppm CH<jats:sub>2</jats:sub>O to 4% CH<jats:sub>2</jats:sub>O were satisfactorily modeled by a five‐reaction mechanism. © 1993 John Wiley & Sons, Inc.</jats:p>

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