Density functional theory calculation of propane cracking mechanism over chromium (III) oxide by cluster approach

Abstract

The catalyst coking and production of undesired products during the transformation of propane into propylene has been the critical challenge in the on purpose approach of propylene production. The mechanism contributing to this challenge was theoretically investigated through the analysis of cracking reaction routes. The study carried out employed the use of a DFT and cluster approach in order to understand the reactions that promote cooking of the cat­alyst and in the search for the kinetic and thermodynamic data of the reaction mechanism involved in the process over Cr2O3. The RDS and feasible route that easily promote the production of small hydrocarbons like ethylene, meth­ane, and many others were identified. The study suggests Cr-site substitution or co-feeding of oxygen, as a way that aids in preventing deep dehydrogenation in the conversion of propane to propylene. This information will help in imp­ro­ving the Cr2O3 catalyst perfor­mance and further increase the production yield.