Platinum is a useful metal for catalytic hydrocarbon conversion. One such conversion, dry reforming of methane (DRM), is of considerable significance as an alternative and renewable method of synthesis gas production. The heterogenous metal-catalyzed reaction has been optimized with various catalysts, promoters, and support materials to reduce coking, or surface carbon contamination, and optimize catalytic activity. In this work, platinum was deposited onto a boron-doped silica support material, which has been shown to reduce coking effects. Surface characterization techniques were used to determine the role of boron on the platinum catalyst and catalytic activity. X-ray photoelectron spectroscopy (XPS) was used to determine the presence of boron surface species in trigonal (BO3) and tetrahedral (BO4) configurations. XPS results were also in agreement with solid state 2D NMR, which revealed that the trigonal and tetrahedral boron sites existed in the bulk as well. Density functional theory (DFT) was performed to further characterize the effect of boron on platinum species by calculating the relative adsorption energies of several platinum compounds on boron-doped silica structures for comparison with boron-free silica structures, which revealed that boron-doped silica was more thermodynamically favorable for platinum adsorption. A butane dehydrogenation reaction was used as a model reaction to produce deactivated catalysts for further analysis, and Amsterdam density functional was utilized to calculate theoretical chemical shifts. For deactivated Pt/B/SiO2 catalysts, 2D NMR and ADF results revealed that a new carbon-boron functionality was formed, but only in the presence of platinum, and catalytic studies confirmed that Pt/B/SiO2 catalysts had increased catalytic activity over Pt/SiO2 catalysts. From these results, it was concluded that the presence of boron reduced coking by migration of carbon contamination from platinum to boron by a synergistic effect of the platinum/boron alloy.

Determination of the anti-coking effect of boron for supported platinum catalysts

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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