Influence of Nanoscale Intimacy in Bi-Functional Catalysts for CO2-Assisted Dehydrogenation of C5-Paraffins

In this study, Pt1Sn1 intermetallic nanoparticles (NPs) on SiO2/CeO2@SiO2 composites were located either SiO2 or CeO2@SiO2, thereby varying the average distance (intimacy) between metal sites and CeOx from “closest” to “nanoscale”. The catalytic performance of these catalysts was compared dual-bed mixtures Pt1Sn1@SiO2 CeO2@SiO2 powders, which provided a “milliscale” sites. Several beneficial effects CO2-assisted oxidative dehydrogenation C5-paraffins observed when in nanoscale proximity CeO2 sites, as opposed Pt Sn species with closest milliscale intimacy CeO2. former exhibited highest C5-paraffin conversion 32.8%, C5 total olefin selectivity 68.7%, while closest-proximity sample had lower 17.4%, 20.9%. FT-IR (Fourier transform infrared spectroscopy) spectroscopic study CO adsorption X-ray photoelectron spectroscopy results revealed that Ce inhibited PtSn alloy formation due their strong interaction. However, for nanoscale-proximity sample, neighboring did not disturb formation. This strategy can be applied other CO2 activation catalysts, instead CeO2@SiO2. paper aims provide insights into influence metal–CeOx bi-functional catalysts.