Kinetic Modeling of the Heterogeneously Catalyzed Oxidation of Propene to Acrolein in a Catalytic Wall Reactor

Abstract

Using data from isothermal investigations in a catalytic wall reactor (Redlingsho ¨fer, H.; Kro ¨cher, O.; Bo ¨ck, W.; Huthmacher, K.; Emig, G. Ind. Eng. Chem. Res. 2002, 41, 1445, the kinetics of the highly exothermic vapor-phase oxidation of propene was determined by statistical parameter estimation. It was shown that the oxidation of propene to acrolein follows a redox mechanism, with a change in the rate-determining step that depends on temperature. Two kinetic equations for the reduction and reoxidation regimes were necessary for a good fit to the experimental values. About a 3-fold higher activation energy for the reoxidation step and different propene and oxygen concentration dependencies of the rate equations in the two regimes were observed. An increasing water content improves catalyst reoxidation. This special catalytic effect was modeled by including an activity function. The kinetics of the byproducts acrylic acid, carbon oxides, formaldehyde, acetaldehyde, and acetic acid were considered with a reaction scheme consisting of 10 reactions. The model describes the experimental data very well. It includes 31 significant kinetic parameters.

A Comparative Review of Petroleum‐Based and Bio‐Based Acrolein Production

“…[57,58] Redingshofer et al introduced a catalytic wall reactor, for which a specific temperature could be considerably better maintained during operation. [25,59] They suggested using this type of "wall reactor" to conduct kinetic and mechanistic studies of highly exothermic reactions to achieve more reliable results. O'Neil et al developed a distributive membrane reactor, which could increase the acrolein yield and suppress CO x production by lowering the partial pressure of oxygen.…”

Kinetic Analysis of the Hydrocarbon Total Oxidation Using Individually Measured Adsorption Isotherms

“…Based on these mechanisms different global kinetic rate approaches can be determined [22,24,25]. However, at special conditions experimental measured concentration pro-files can be explained with several rate models [26,27]. The rate models used for the kinetic modeling are presented in Sect.…”

Catalytic synthesis of methanethiol from methanol and carbon disulfide over KW/Al2O3 catalysts

“…The catalyst system, which was applied to catalyze the synthesis of methanethiol from methanol and hydrogen sulfide, was found to be a transition metal oxide-supported and alkali metal-promoted γ-alumina catalyst [14][15][16][17]. But, it is worth mentioning that one of the raw materials (hydrogen sulfide, H 2 S) of this method is mainly obtained by means of the combustion of natural gas and sulfur in industry.…”