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Title: Insights into the methanol synthesis mechanism via CO2 hydrogenation over Cu-ZnO-ZrO2 catalysts: Effects of surfactant/Cu-Zn-Zr molar ratio

Abstract

In this study, we evaluated aspects of the CO2 hydrogenation mechanism, correlating structure-activity relationships of Cu-ZnO-ZrO2 catalysts prepared by one-pot surfactant-assisted co-precipitation with different surfactant ratios. Identifying the CO2 hydrogenation pathway intermediates is key to controlling the reaction selectivity. Experimental evidence shows that the CO2 is dissociating into CO* and O* onto the surface of the Cu-ZnO-ZrO2 catalyst. The adsorption and dissociation of CO2 were evidenced by a combination of in situ ambient-pressure X-ray Photoelectron Spectroscopy (AP-XPS) and Fourier Transform Infrared Spectroscopy (FTIR) with a transmission cell. AP-XPS showed that the catalysts are composed of a Cu2+, Zr3+, and Zr4+ mixture and two kinds of Zn2+ species. After the H2 reduction process, only Cu2+ was reduced to Cu0. The Zn and Zr species were oxidized by the dissociated O* species. In situ transmission FTIR showed that CO was adsorbed onto the Cu+/0 sites. The catalyst with the higher surfactant molar ratio exhibited the highest CO2 conversion close to the equilibrium conversion, as well as a good methanol formation rate.

Authors:
 [1];  [2];  [2];  [2]; ORCiD logo [2];  [3];  [1];  [1]
  1. Univ. of Sao Paulo (Brazil)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Federal Univ. of Sao Carlos (Brazil)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1637476
Report Number(s):
BNL-216106-2020-JAAM
Journal ID: ISSN 2212-9820
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Journal of CO2 Utilization
Additional Journal Information:
Journal Volume: 41; Journal Issue: C; Journal ID: ISSN 2212-9820
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Cu-ZnO-ZrO2; Surfactant-assisted co-precipitation; Reaction mechanism; Methanol; CO2 hydrogenation

Citation Formats

Marcos, Francielle C. F., Lin, Lili, Betancourt, Luis E., Senanayake, Sanjaya D., Rodriguez, Jose A., Assaf, José M., Giudici, Reinaldo, and Assaf, Elisabete M. Insights into the methanol synthesis mechanism via CO2 hydrogenation over Cu-ZnO-ZrO2 catalysts: Effects of surfactant/Cu-Zn-Zr molar ratio. United States: N. p., 2020. Web. doi:10.1016/j.jcou.2020.101215.
Marcos, Francielle C. F., Lin, Lili, Betancourt, Luis E., Senanayake, Sanjaya D., Rodriguez, Jose A., Assaf, José M., Giudici, Reinaldo, & Assaf, Elisabete M. Insights into the methanol synthesis mechanism via CO2 hydrogenation over Cu-ZnO-ZrO2 catalysts: Effects of surfactant/Cu-Zn-Zr molar ratio. United States. https://doi.org/10.1016/j.jcou.2020.101215
Marcos, Francielle C. F., Lin, Lili, Betancourt, Luis E., Senanayake, Sanjaya D., Rodriguez, Jose A., Assaf, José M., Giudici, Reinaldo, and Assaf, Elisabete M. Fri . "Insights into the methanol synthesis mechanism via CO2 hydrogenation over Cu-ZnO-ZrO2 catalysts: Effects of surfactant/Cu-Zn-Zr molar ratio". United States. https://doi.org/10.1016/j.jcou.2020.101215. https://www.osti.gov/servlets/purl/1637476.
@article{osti_1637476,
title = {Insights into the methanol synthesis mechanism via CO2 hydrogenation over Cu-ZnO-ZrO2 catalysts: Effects of surfactant/Cu-Zn-Zr molar ratio},
author = {Marcos, Francielle C. F. and Lin, Lili and Betancourt, Luis E. and Senanayake, Sanjaya D. and Rodriguez, Jose A. and Assaf, José M. and Giudici, Reinaldo and Assaf, Elisabete M.},
abstractNote = {In this study, we evaluated aspects of the CO2 hydrogenation mechanism, correlating structure-activity relationships of Cu-ZnO-ZrO2 catalysts prepared by one-pot surfactant-assisted co-precipitation with different surfactant ratios. Identifying the CO2 hydrogenation pathway intermediates is key to controlling the reaction selectivity. Experimental evidence shows that the CO2 is dissociating into CO* and O* onto the surface of the Cu-ZnO-ZrO2 catalyst. The adsorption and dissociation of CO2 were evidenced by a combination of in situ ambient-pressure X-ray Photoelectron Spectroscopy (AP-XPS) and Fourier Transform Infrared Spectroscopy (FTIR) with a transmission cell. AP-XPS showed that the catalysts are composed of a Cu2+, Zr3+, and Zr4+ mixture and two kinds of Zn2+ species. After the H2 reduction process, only Cu2+ was reduced to Cu0. The Zn and Zr species were oxidized by the dissociated O* species. In situ transmission FTIR showed that CO was adsorbed onto the Cu+/0 sites. The catalyst with the higher surfactant molar ratio exhibited the highest CO2 conversion close to the equilibrium conversion, as well as a good methanol formation rate.},
doi = {10.1016/j.jcou.2020.101215},
journal = {Journal of CO2 Utilization},
number = C,
volume = 41,
place = {United States},
year = {Fri Jun 26 00:00:00 EDT 2020},
month = {Fri Jun 26 00:00:00 EDT 2020}
}

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