To quantify the atmospheric reactivity of diisopropyl ether (DIPE), we have conducted a study of the kinetics and mechanism of reaction 1: OH + DIPE → products. Kinetic measurements of reaction 1 were made using both -relative (at 295 K) and absolute techniques (over the temperature range 240-440 K). Rate data from both techniques can be represented by the following: k1 = (2.2-0.8 +1.4 x 10-12 exp[(445 ± 145)/T]cm3 molecule-1s-1. At 298 K, k1 = 9.8 X 10-12cm3 molecule-1 s-1. The products of the simulated atmospheric oxidation of DIPE were identified using FT-IR spectroscopy; isopropyl acetate and HCHO were the main products. The atmospheric oxidation of DIPE can be represented by i-C3H7O-i-C3H7+OH+2NO→ HCHO+i-C3H7OC(O)CH3+HO2+2NO2. Our kinetic and mechanistic data were incorporated into a 1-day simulation of atmospheric chemistry to quantify the relative incremental reactivity of DIPE. Results are compared with other oxygenated fuel additives.
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Science(all)
- Environmental Chemistry
- Earth and Planetary Sciences(all)