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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

yngas production by methane tri-reforming: Effect of Ni/CeO2 synthesis method on oxygen vacancies and coke formatio

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Author(s):
Anchieta, Chayene Goncalves [1, 2] ; Assaf, Elisabete Moreira [3] ; Assaf, Jose Mansur [2]
Total Authors: 3
Affiliation:
[1] Paul Scherrer Inst, Forschungsstr 111, CH-5232 Villigen - Switzerland
[2] Univ Fed Sao Carlos, Dept Chem Engn, BR-13565905 Sao Carlos - Brazil
[3] Univ Sao Paulo, Chem Inst Sao Carlos, BR-13566590 Sao Paulo, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: JOURNAL OF CO2 UTILIZATION; v. 56, FEB 2022.
Web of Science Citations: 0
Abstract

The CH4 tri-reforming process can contribute to mitigating CO2 emissions and enables the formation of syngas with different H-2/CO ratios. Ni catalysts supported on CeO2 were synthesized by hydrothermal and ionothermal methods and were applied in methane tri-reforming reactions with GHSV of 48,000 mL/g.h, at atmospheric pressure and temperature of 800 degrees C. The catalytic activity in the tri-reforming reaction was enhanced by changing the morphological properties of the catalyst by appropriate selection of the amount of ionic liquid used in the synthesis procedure. Changing the composition resulted in methane conversion increasing from 60 % to 95 % and carbon dioxide conversion increasing from 40 % to 55 %. Increased Ni dispersion was related to the oxygen vacancies on the Ni-Ce surface, which created interfacial active sites. The results of XANES combined with XPS revealed that a partial reduction of Ni species contributed to high hydrogen yields, due to the distribution of active sites over the catalyst surface. These sites remained active during 5 h, demonstrating the positive effect of the ionic liquid used in the CeO2 synthesis. In addition, post-reaction characterization results showed Ni re-oxidation on the ceria support produced without ionic liquid. (AU)

FAPESP's process: 15/06246-7 - Biorefinery concept applied to biological wastewater treatment plants: environmental pollution control coupled with material and energy recovery
Grantee:Marcelo Zaiat
Support Opportunities: Research Projects - Thematic Grants
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