Table I Oxidation of propene: Effect of temperature during acetaldehyde co-oxidation on product selectivities (%) at end of reaction. Glass, static reactor. 5% O2, 3.4% CH3CHO, remainder C3H6, total pressure 0.92 bar. Simulated results in parenthesis.
Temperature (K) 505 528 549
CO 3.8(6.8) 5.0(8.2) 7.4(9.8)
CO2 8.5(13.0) 7.6(11.3) 6.5(10.4)
HCHO 11.1(9.2) 11.1(11.2) 12.9(12.8)
CH3OH 1.1(7.1) 3.3(7.2) 3.6(7.8)
CH3CHO -7.0(-15.2) -1.7(-6.1) 1.0(-3.3)
C3H6O 61.1a(46.1) 46.5(38.8) 39.0(34.8)
C3H6O {with [CH3CHO]initial=0}b 46.1(44.2) 39.2(42.2) 37.2(40.5)
other products 21.4(33.0) 28.2(29.4) 29.6(27.7)
d[C3H6]/[C3H6] (%) 3.0(3.9) 3.2(4.0) 3.7(3.9)
Time for oxygen consumption (min) 38(22) 17(5.5) 4.0(1.5)
b The epoxide selectivity with no initial acetaldehyde is given for comparison. These experiments had a pressure of 4.0 bar, but were otherwise similar to the propene:acetaldehyde co-oxidation experiments (see text).