Measurement of intrinsic catalytic activity of Pt monometallic and Pt-MoOx interfacial sites over visible light enhanced PtMoOx/SiO2 catalyst in reverse water gas shift reaction

Insoo Ro; Canan Sener; Thomas M. Stadelman; Madelyn R. Ball; Juan M. Venegas; Samuel P. Burt; Ive Hermans; James A. Dumesic; George W. Huber

doi:10.1016/j.jcat.2016.08.011

Measurement of intrinsic catalytic activity of Pt monometallic and Pt-MoO_x interfacial sites over visible light enhanced PtMoO_x/SiO₂ catalyst in reverse water gas shift reaction

Insoo Ro, Canan Sener, Thomas M. Stadelman, Madelyn R. Ball, Juan M. Venegas, Samuel P. Burt, Ive Hermans, James A. Dumesic, George W. Huber

Dept. of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

Supported Pt-Mo catalysts were prepared with different Mo contents by a controlled surface reaction (CSR) method and studied for the reverse water gas shift (RWGS) reaction under dark and visible light irradiation conditions. Characterization results from Raman spectroscopy, scanning transmission electron microscopy (STEM), CO chemisorption, and inductively coupled plasma-absorption emission spectroscopy (ICP-AES) indicate that selective Mo deposition onto Pt was achieved at low Mo loading (Mo/Pt ratio < 0.3). Mo deposition changed the apparent activation energy and CO₂ and CO reaction orders. Visible light irradiation changed the apparent activation energy and reaction orders of CO₂, CO, and H₂, ascribed to direct photoexcitation. The intrinsic activity of a Pt site is 0.4 and 4.1 min⁻¹ under dark and light conditions at 473 K, respectively, whereas the intrinsic activity of a Pt-MoO_x site is increased to 22.7 and 160 min⁻¹ under dark and light conditions at 473 K, respectively.

Original language	English
Pages (from-to)	784-794
Number of pages	11
Journal	Journal of Catalysis
Volume	344
DOIs	https://doi.org/10.1016/j.jcat.2016.08.011
State	Published - 1 Dec 2016

Keywords

Active sites
Bimetallic catalyst
Interfacial sites
Monometallic sites
Photocatalysis
Reverse water gas shift (RWGS) reaction
Visible light response

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10.1016/j.jcat.2016.08.011

Cite this

Ro, I., Sener, C., Stadelman, T. M., Ball, M. R., Venegas, J. M., Burt, S. P., Hermans, I., Dumesic, J. A., & Huber, G. W. (2016). Measurement of intrinsic catalytic activity of Pt monometallic and Pt-MoO_x interfacial sites over visible light enhanced PtMoO_x/SiO₂ catalyst in reverse water gas shift reaction. Journal of Catalysis, 344, 784-794. https://doi.org/10.1016/j.jcat.2016.08.011

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title = "Measurement of intrinsic catalytic activity of Pt monometallic and Pt-MoOx interfacial sites over visible light enhanced PtMoOx/SiO2 catalyst in reverse water gas shift reaction",

abstract = "Supported Pt-Mo catalysts were prepared with different Mo contents by a controlled surface reaction (CSR) method and studied for the reverse water gas shift (RWGS) reaction under dark and visible light irradiation conditions. Characterization results from Raman spectroscopy, scanning transmission electron microscopy (STEM), CO chemisorption, and inductively coupled plasma-absorption emission spectroscopy (ICP-AES) indicate that selective Mo deposition onto Pt was achieved at low Mo loading (Mo/Pt ratio < 0.3). Mo deposition changed the apparent activation energy and CO2 and CO reaction orders. Visible light irradiation changed the apparent activation energy and reaction orders of CO2, CO, and H2, ascribed to direct photoexcitation. The intrinsic activity of a Pt site is 0.4 and 4.1 min−1 under dark and light conditions at 473 K, respectively, whereas the intrinsic activity of a Pt-MoOx site is increased to 22.7 and 160 min−1 under dark and light conditions at 473 K, respectively.",

keywords = "Active sites, Bimetallic catalyst, Interfacial sites, Monometallic sites, Photocatalysis, Reverse water gas shift (RWGS) reaction, Visible light response",

author = "Insoo Ro and Canan Sener and Stadelman, \{Thomas M.\} and Ball, \{Madelyn R.\} and Venegas, \{Juan M.\} and Burt, \{Samuel P.\} and Ive Hermans and Dumesic, \{James A.\} and Huber, \{George W.\}",

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doi = "10.1016/j.jcat.2016.08.011",

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Ro, I, Sener, C, Stadelman, TM, Ball, MR, Venegas, JM, Burt, SP, Hermans, I, Dumesic, JA & Huber, GW 2016, 'Measurement of intrinsic catalytic activity of Pt monometallic and Pt-MoO_x interfacial sites over visible light enhanced PtMoO_x/SiO₂ catalyst in reverse water gas shift reaction', Journal of Catalysis, vol. 344, pp. 784-794. https://doi.org/10.1016/j.jcat.2016.08.011

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T1 - Measurement of intrinsic catalytic activity of Pt monometallic and Pt-MoOx interfacial sites over visible light enhanced PtMoOx/SiO2 catalyst in reverse water gas shift reaction

AU - Ro, Insoo

AU - Sener, Canan

AU - Stadelman, Thomas M.

AU - Ball, Madelyn R.

AU - Venegas, Juan M.

AU - Burt, Samuel P.

AU - Hermans, Ive

AU - Dumesic, James A.

AU - Huber, George W.

PY - 2016/12/1

Y1 - 2016/12/1

N2 - Supported Pt-Mo catalysts were prepared with different Mo contents by a controlled surface reaction (CSR) method and studied for the reverse water gas shift (RWGS) reaction under dark and visible light irradiation conditions. Characterization results from Raman spectroscopy, scanning transmission electron microscopy (STEM), CO chemisorption, and inductively coupled plasma-absorption emission spectroscopy (ICP-AES) indicate that selective Mo deposition onto Pt was achieved at low Mo loading (Mo/Pt ratio < 0.3). Mo deposition changed the apparent activation energy and CO2 and CO reaction orders. Visible light irradiation changed the apparent activation energy and reaction orders of CO2, CO, and H2, ascribed to direct photoexcitation. The intrinsic activity of a Pt site is 0.4 and 4.1 min−1 under dark and light conditions at 473 K, respectively, whereas the intrinsic activity of a Pt-MoOx site is increased to 22.7 and 160 min−1 under dark and light conditions at 473 K, respectively.

AB - Supported Pt-Mo catalysts were prepared with different Mo contents by a controlled surface reaction (CSR) method and studied for the reverse water gas shift (RWGS) reaction under dark and visible light irradiation conditions. Characterization results from Raman spectroscopy, scanning transmission electron microscopy (STEM), CO chemisorption, and inductively coupled plasma-absorption emission spectroscopy (ICP-AES) indicate that selective Mo deposition onto Pt was achieved at low Mo loading (Mo/Pt ratio < 0.3). Mo deposition changed the apparent activation energy and CO2 and CO reaction orders. Visible light irradiation changed the apparent activation energy and reaction orders of CO2, CO, and H2, ascribed to direct photoexcitation. The intrinsic activity of a Pt site is 0.4 and 4.1 min−1 under dark and light conditions at 473 K, respectively, whereas the intrinsic activity of a Pt-MoOx site is increased to 22.7 and 160 min−1 under dark and light conditions at 473 K, respectively.

KW - Active sites

KW - Bimetallic catalyst

KW - Interfacial sites

KW - Monometallic sites

KW - Photocatalysis

KW - Reverse water gas shift (RWGS) reaction

KW - Visible light response

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