| Full text | |
| Author(s): |
Maluf, Nagila E. C.
[1]
;
Braga, Adriano H.
[1]
;
Gothe, Maite L.
[1]
;
Borges, Lais R.
[1]
;
Alves, Gustavo A. S.
[2]
;
Goncalves, Renato V.
[2]
;
Szanyi, Janos
[3]
;
Vidinha, Pedro
[1]
;
Rossi, Liane M.
[1]
Total Authors: 9
|
| Affiliation: | [1] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil
[2] Univ Sao Paulo, Sao Carlos Inst Phys, POB 369, BR-13560970 Sao Carlos, SP - Brazil
[3] Pacific Northwest Natl Lab, Inst Integrated Catalysis, Richland, WA 99352 - USA
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | European Journal of Inorganic Chemistry; v. 2021, n. 44 SEP 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
The conversion of CO2 into CO is an important step in CO2 utilization to achieve clean fuels and value-added chemicals. Herein, we explored the pyrolysis of zeolitic imidazolate framework-8 (ZIF-8) loaded with different amounts of Ni2+ to obtain Ni-Zn carbide (Ni3ZnC) embedded in N-doped carbon. Ni is present in the intermetallic compound, while Zn excess remains on the N-doped carbon. The Ni3ZnC phase catalyzes the selective hydrogenation of CO2 into CO via the reverse water gas shift reaction, reaching 100 % CO selectivity at similar to 30 % CO2 conversion at 450 degrees C and atmosphere pressure (CO2 : H-2=1 : 4, GHSV=30000 mL g(cat)(-1) h(-1)). The methanation reaction of CO2/CO, which is usually favored over Ni catalysts, is suppressed. The selectivity to CO at the expense of CH4 is related to the stability of chemisorbed CO in the Ni3ZnC surface, which is lower compared to Ni surfaces. The Ni3ZnC@NC catalyst is selective towards CO over a wide range of conditions, including high pressure, that is usually required for the conversion of CO to hydrocarbons and alcohols via the Fisher-Tropsch synthesis (FTS) process. Contrarily, a classical Ni/SiO2 catalyst prepared by impregnation produces CH4 under high pressure. (AU) | |
| FAPESP's process: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Grantee: | Julio Romano Meneghini |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |