Benzaldehyde oxidation catalyzed by the wall of a tubular bubble column reactor

Experiments and model for the oscillatory oxidation of benzaldehyde

“…The oscillations were visually evident in dramatic color changes of the reaction mixture as the dominant form of the cobalt catalyst varied between Co(II) (pink) and Co(III) (brown/ black). Investigations into the mechanism of the oxidation of benzaldehyde and other aldehydes catalyzed by metal ions have proposed steps involving free radicals (Bawn, 1983;Hendriks et al, 1977Hendriks et al, , 1978; Kuo and Chou, 1988). Several detailed mechanisms which predict oscillations in the oxidation of benzaldehyde have been proposed (Roelofs et al, 1983(Roelofs et al, , 1987; Yuan and Noyes, 1988).…”

Heterogenized Homogeneous Catalyst. 7. Comparisons of Thermal Oxidation and Heterogenized Homogeneous Co- and Mn-Type Resin Catalyzed Oxidation of Propionaldehyde

“…Oxidation of aldehyde using heterogenized homogeneous Co-type resin as catalyst was investigated to be a free-radical scheme (Chou and Lee, 1985;Hwang and Chou, 1987; Kuo and Chou, 1988;Chou and Yeh, 1992a,b). The reaction mechanism includes initiation of free-radical, propagation, and termination reactions.…”

“…To improve the selectivity of peracids, Co-type resin was employed as catalyst in the presence of oxygen to oxidize aldehydes to peracids (Chou and Lee, 1985; * Author to whom correspondence should be addressed. 0888-5885/94/2633-2523$04.50/0 Hwang and Chou, 1987; Kuo and Chou, 1988; Chou and Yeh, 1992a,b). These previous results showed it a potential method to increase the selectivity of peracids.…”