Event Title

Oxide-Supported Metal Phosphides as New Photocatalysts for CO2 Hydrogenation

Research Mentor(s)

Mark Bussell

Description

The photocatalytic conversion of carbon dioxide (CO2) to carbon monoxide (CO) via the reverse water gas shift (RWGS) reaction has attracted interest as a reaction step in the production of C1-based solar fuels ((CH3OH, CH4). Nanoscale metal phosphides (InP, InxGa1-xP) – supported on high surface area silica (SiO2) have been prepared. The metal phosphide catalysts were synthesized by temperature-programmed reduction (TPR) of hypophosphite-based precursors, yielding phosphide particles in the 20-30 nm range on the silica support. The catalysts were characterized by X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS), as well as by X-ray photoelectron (XPS) and diffuse reflectance UV-Vis spectroscopies. Preliminary photocatalytic measurements were carried out using a modified Harrick reactor system outfitted with a mounted LED light source (445 mW) having a nominal wavelength of 595 nm and a reactor feed consisting of 3:1 mole ratio of hydrogen to CO2. The photocatalytic properties (activity, selectivity) of the metal phosphide catalysts can be probed as a function of the loading, morphology (size, shape) and composition of the nanoparticles as well as the optical properties of the catalysts.

Document Type

Event

Start Date

May 2018

End Date

May 2018

Location

Chemistry

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

Language

English

Format

application/pdf

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May 16th, 12:00 PM May 16th, 3:00 PM

Oxide-Supported Metal Phosphides as New Photocatalysts for CO2 Hydrogenation

Chemistry

The photocatalytic conversion of carbon dioxide (CO2) to carbon monoxide (CO) via the reverse water gas shift (RWGS) reaction has attracted interest as a reaction step in the production of C1-based solar fuels ((CH3OH, CH4). Nanoscale metal phosphides (InP, InxGa1-xP) – supported on high surface area silica (SiO2) have been prepared. The metal phosphide catalysts were synthesized by temperature-programmed reduction (TPR) of hypophosphite-based precursors, yielding phosphide particles in the 20-30 nm range on the silica support. The catalysts were characterized by X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS), as well as by X-ray photoelectron (XPS) and diffuse reflectance UV-Vis spectroscopies. Preliminary photocatalytic measurements were carried out using a modified Harrick reactor system outfitted with a mounted LED light source (445 mW) having a nominal wavelength of 595 nm and a reactor feed consisting of 3:1 mole ratio of hydrogen to CO2. The photocatalytic properties (activity, selectivity) of the metal phosphide catalysts can be probed as a function of the loading, morphology (size, shape) and composition of the nanoparticles as well as the optical properties of the catalysts.