The Ru/CeO2-NaOH-NaI Solvent-free Catalytic System for the Hydroesterification of C2H4, CO, and C2H5OH

Abstract

Ethyl propionate can be produced from CO, C₂H₄, and CH₃CH₂OH as raw materials by ethylene hydroesterification in one step. In this paper, a solvent-free composite catalytic system (Ru/CeO₂-NaI-NaOH) is developed to catalyze the hydroesterification of C₂H₄, CO, and C₂H₅OH. The formation and inhibition mechanisms of 3-pentanone and acetal are studied, and the pathway for the generation of ethyl propionate has also been analyzed. The factors that influence the performance of catalytic system were researched, such as catalyst reduction temperature, the addition of Ru/CeO₂, reaction temperature, reaction time, the partial pressure of CO, and so forth. In Ru/CeO₂-NaOH-NaI heterogeneous catalytic system, at the experiment conditions of 3 MPa and 180 °C, the C₂H₄ conversion and the ethyl propionate selectivity are 66.7% and 92.0%, respectively after 4 h reaction. This work presents a strategy for the production of propionate by ethylene hydroesterification, catalyzed by a heterogeneous catalytic system.