| Full text | |
| Author(s): |
Marcos, Francielle C. F.
[1]
;
Lin, Lili
[2]
;
Betancourt, Luis E.
[2]
;
Senanayake, Sanjaya D.
[2]
;
Rodriguez, Jose A.
[2]
;
Assaf, Jose M.
[3]
;
Giudici, Reinaldo
[1]
;
Assaf, Elisabete M.
[4]
Total Authors: 8
|
| Affiliation: | [1] Univ Sao Paulo, Escola Politecn, Av Prof Luciano Gualberto 3, BR-05508010 Sao Paulo, SP - Brazil
[2] Brookhaven Natl Lab, Chem Div, Upton, NY 11973 - USA
[3] Univ Fed Sao Carlos, Km 235, BR-13565905 Sao Carlos, SP - Brazil
[4] Univ Sao Paulo, Sao Carlos Inst Chem, Av Trabalhador Sao Carlense 400, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | JOURNAL OF CO2 UTILIZATION; v. 41, OCT 2020. |
| Web of Science Citations: | 2 |
| 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 CuZnO-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 H-2 reduction process, only Cu2+ was reduced to Cu-0. 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. (AU) | |
| FAPESP's process: | 17/08293-8 - Project 14: direct synthesis of methanol from CO2 |
| Grantee: | Francielle Candian Firmino Marcos |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Grantee: | Julio Romano Meneghini |
| Support Opportunities: | Research Grants - Applied Research Centers Program |
| FAPESP's process: | 18/05799-0 - A surface science investigation of methanol synthesis on Cu-Ga/ZrO2 catalysts |
| Grantee: | Francielle Candian Firmino Marcos |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |