Ni/CeO2 promoted Ru and Pt supported on FeCrAl gauze for cycling methane catalytic partial oxidation—CPOX

•Ni on CeO2/FeCrAl partially oxidizes methane into synthesis gas in a gauze reactor.•Ru promotes Ni/CeO2/FeCrAl better than Pt.•Pt promotion decreases synthesis gas yield and produce coke refractory to air oxidation.•2.25% Ni with 0.1% Ru (Ni2510) was the most active and selective catalyst.•Ni2510 w...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2021-06, Vol.286, p.119849, Article 119849
Main Authors: Pauletto, Gianluca, Libretto, Nicole, Boffito, Daria C., Miller, Jeffrey T., Jentys, Andreas, Patience, Gregory S., Lercher, Johannes A.
Format: Article
Language:English
Subjects:
Air temperature
Carbon monoxide
Catalysts
Cerium oxides
CPOX
FeCrAl
Gauze
Methane
Natural gas
Ni/CeO2
Oxidation
Regeneration
Ruthenium
Selectivity
Syngas
Synthesis gas
Turnover rate
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Summary:•Ni on CeO2/FeCrAl partially oxidizes methane into synthesis gas in a gauze reactor.•Ru promotes Ni/CeO2/FeCrAl better than Pt.•Pt promotion decreases synthesis gas yield and produce coke refractory to air oxidation.•2.25% Ni with 0.1% Ru (Ni2510) was the most active and selective catalyst.•Ni2510 was stable after 50 reaction-regeneration cycles. Stranded natural gas is economically unattractive due to high operating and investment costs of conventional technologies necessary to bring it to market. However, milli-second reactors operating at a GHSV up to 200 000 h−1 reduce investment. The first step of a gas-to-liquids process produces syngas—a mixture of CO and H2. Here, we propose promoted Ni-based catalysts supported on FeCrAl knitted gauze to partially oxidize CH4 in air to syngas. High syngas selectivities at 1 bar, 700 °C and CH4/O2 ratios of 2.5 to 5 suggests an apparent direct reaction path to CO and H2. Ru promoted catalysts had higher turnover rates in CH4 activation compared to Ni, Ni-Pt and Ni-Pt-Ru. All catalysts containing Pt formed carbon species refractory to air regeneration at 700 °C. 2.25% Ni with 0.1% Ru had the highest CH4 turnover rate (155 mol s−1 mol−1) and CO selectivity (80%) at a CH4/O2 ratio 2.5. CH4 conversion and CO production were constant after 50 reaction-regeneration cycles that dosed the catalyst for 25 min with methane/air followed by an equal time in air at the same reaction temperature.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2020.119849