Porous Silica Coated Ceria as a Switch in Tandem Oxidative Dehydrogenation and Dry Reforming of Ethane with CO₂

Abstract

The oxidative dehydrogenation of ethane using CO2 as soft oxidant for the production of ethylene, possesses the features of valorization of light alkane and utilization of greenhouse gas. Although a significant challenge, the control of the reaction extent can provide a potential on‐purpose ethylene technology. In the present paper, CeO2 is proposed to be a promising catalyst, while the deep oxidation process of dry reforming is preferred. The SiO2 coated CeO2 catalyst can render the reaction more selective towards ethylene. Through high sensitivity low energy ion scattering spectroscopy, findings were made that SiO2 only partially covered CeO2 in the Si0.1CeO2 sample, in which the ethylene selectivity was 2.7 times as high as that of the bulk CeO2 based on the same conversion level. Further, density functional theory calculations also demonstrated that the presence of the SiO2 layer was more conducive to the desorption of ethylene.

Thermocatalytic CO2conversion by siliceous matter: a review

“…333,348,349 A SiO 2 coated layer exhibited the ability to ne tune the reaction selectivity of the CeO 2 active phase in the dry reforming of ethane, preventing the deep oxidation of ethane. 334 A mesoporous organosilica support was employed to host and stabilize Cr for ethane dry reforming. 335 In another study, silicon boride was directly employed as the active component for the dry reforming of ethane, propane, and isobutane.…”