Dry reforming of methane provides opportunities for using CH4 and CO2 to produce syngas. The PtCo/CeO2 bimetallic catalyst shows higher activity and H2/CO ratio than the corresponding monometallic catalysts within a wide range of temperature (773-1073 K) and space velocity (12-240 L/gcat/h), mainly attributed to the Pt-Co synergistic effect. Temperature-programmed reduction (TPR), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), in situ X-ray absorption fine structure (XAFS) and in situ X-ray diffraction (XRD) results indicate that Pt significantly enhances Co reducibility with electron transfer and confirm the Pt-Co bimetallic bond formation. Combined kinetic investigations and DFT calculations reveal that the presence of Co with Pt enriches the abundance of O* over the metal surface by promoting CO2 activation and increasing O* binding strength. The PtCo/CeO2 catalyst is resistant to coke formation as effectively as Pt/CeO2. Although gradual deactivation is observed at the high space velocity (240 L/gcat/h), thermogravimetric analysis (TGA), transmission electron microscope (TEM) and Raman spectroscopy show that the catalyst can be easily regenerated by a mild CO2 treatment.

Dry reforming of methane over CeO2-supported Pt-Co catalysts with enhanced activity

256th National Meeting (2018)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.