A comparison of the nanoscale Er2O3 and BaCl2/Er2O3 catalysts prepared by sol-gel method with their large-size counterparts has been made for the oxidative dehydrogenation of ethane (ODE) to ethylene. The nanoscale catalysts showed better catalytic performance than the corresponding large-size ones. We detected that the extent of cubic Er2O3 lattice enlargement in nanoscale BaCl2/Er2O3 was larger than that in the large-size one and more defects were generated in the nanoscale catalyst. TPR results indicated that compared to the large-size catalysts, there were more reducible oxygen adspecies present on the nanoscale ones. In situ Raman studies revealed that the reduction in particle size was beneficial for the activation of oxygen molecules. Based on the activity and Raman results, we suggest that dioxygen species are responsible for the selective oxidation of C2H6 to C2H4.
Scopus Subject Areas
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry