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Title: Reactivity of a Zirconia–Copper Inverse Catalyst for CO2 Hydrogenation

Abstract

Copper–zirconia catalysts have been shown to be effective for methanol synthesis via CO2 hydrogenation, yet the active phases and reaction mechanism remain uncertain. Here, an inverse model catalyst ZrO2/CuO2/Cu(111) was prepared by mass-selected ion deposition and tested for CO2 hydrogenation under near-ambient pressure (AP) reaction conditions by using X-ray photoelectron spectroscopy (NAP-XPS) and infrared reflection–absorption spectroscopy (NAP-IRAS). The spatial resolution afforded by the small entrance cone of the AP-XPS spectrometer was used to resolve regions of the surface with and without Zr deposition. Carbon 1s core level spectra of the ZrO2/Cu2O/Cu(111) regions of the surface under 500 mTorr of CO2 + H2 (1:3 ratio) show evidence for reaction intermediates including carbonate (CO3*), formate (HCOO*), and HxCO* species, with methoxy having the highest surface concentration at 500–600 K. These intermediates are confirmed by IRAS vibrational spectra. In regions of the surface without Zr, the Cu2O/Cu(111) is reduced to metallic Cu, and the surface intermediates are different and are present at much lower concentrations. The observed surface intermediates and their temperature dependence suggest a mechanism in which CO2 is adsorbed on zirconia as carbonate (CO3*) and then converted to HCOO* and HxCO* hydrogenated intermediates that ultimately lead to methoxy (CH3O*), the finalmore » surface-bound precursor for methanol. Overall, the results clearly demonstrate the promotional effects of small ZrO2 particles for enhancing the reactivity of Cu surfaces for CO2 hydrogenation.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [3]
  1. Stony Brook Univ., NY (United States)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Defense Threat Reduction Agency (DTRA)
OSTI Identifier:
1670666
Report Number(s):
BNL-219917-2020-JAAM
Journal ID: ISSN 1932-7447
Grant/Contract Number:  
SC0012704; SC0012573; HDTRA11510005
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 124; Journal Issue: 40; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY

Citation Formats

Ma, Yilin, Wang, Jason, Goodman, Kenneth R., Head, Ashley R., Tong, Xiao, Stacchiola, Dario J., and White, Michael G. Reactivity of a Zirconia–Copper Inverse Catalyst for CO2 Hydrogenation. United States: N. p., 2020. Web. doi:10.1021/acs.jpcc.0c06624.
Ma, Yilin, Wang, Jason, Goodman, Kenneth R., Head, Ashley R., Tong, Xiao, Stacchiola, Dario J., & White, Michael G. Reactivity of a Zirconia–Copper Inverse Catalyst for CO2 Hydrogenation. United States. https://doi.org/10.1021/acs.jpcc.0c06624
Ma, Yilin, Wang, Jason, Goodman, Kenneth R., Head, Ashley R., Tong, Xiao, Stacchiola, Dario J., and White, Michael G. Mon . "Reactivity of a Zirconia–Copper Inverse Catalyst for CO2 Hydrogenation". United States. https://doi.org/10.1021/acs.jpcc.0c06624. https://www.osti.gov/servlets/purl/1670666.
@article{osti_1670666,
title = {Reactivity of a Zirconia–Copper Inverse Catalyst for CO2 Hydrogenation},
author = {Ma, Yilin and Wang, Jason and Goodman, Kenneth R. and Head, Ashley R. and Tong, Xiao and Stacchiola, Dario J. and White, Michael G.},
abstractNote = {Copper–zirconia catalysts have been shown to be effective for methanol synthesis via CO2 hydrogenation, yet the active phases and reaction mechanism remain uncertain. Here, an inverse model catalyst ZrO2/CuO2/Cu(111) was prepared by mass-selected ion deposition and tested for CO2 hydrogenation under near-ambient pressure (AP) reaction conditions by using X-ray photoelectron spectroscopy (NAP-XPS) and infrared reflection–absorption spectroscopy (NAP-IRAS). The spatial resolution afforded by the small entrance cone of the AP-XPS spectrometer was used to resolve regions of the surface with and without Zr deposition. Carbon 1s core level spectra of the ZrO2/Cu2O/Cu(111) regions of the surface under 500 mTorr of CO2 + H2 (1:3 ratio) show evidence for reaction intermediates including carbonate (CO3*), formate (HCOO*), and HxCO* species, with methoxy having the highest surface concentration at 500–600 K. These intermediates are confirmed by IRAS vibrational spectra. In regions of the surface without Zr, the Cu2O/Cu(111) is reduced to metallic Cu, and the surface intermediates are different and are present at much lower concentrations. The observed surface intermediates and their temperature dependence suggest a mechanism in which CO2 is adsorbed on zirconia as carbonate (CO3*) and then converted to HCOO* and HxCO* hydrogenated intermediates that ultimately lead to methoxy (CH3O*), the final surface-bound precursor for methanol. Overall, the results clearly demonstrate the promotional effects of small ZrO2 particles for enhancing the reactivity of Cu surfaces for CO2 hydrogenation.},
doi = {10.1021/acs.jpcc.0c06624},
journal = {Journal of Physical Chemistry. C},
number = 40,
volume = 124,
place = {United States},
year = {Mon Sep 14 00:00:00 EDT 2020},
month = {Mon Sep 14 00:00:00 EDT 2020}
}

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