Plasma-catalysis coupling for CH4 and CO2 conversion over mesoporous macroporous Al2O3: Influence of the physico-chemical properties

[Display omitted] •Macro-mesoporous alumina was synthesized and tested in the DR of methane under DBD.•Alumina with the lowest surface area (65 m2  g−1) exhibits the highest activity.•Conversion favored with Al2O3 possessing the highest number of acid and basic sites.•CH4 and CO2 adsorption is impro...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2021-10, Vol.295, p.120262, Article 120262
Main Authors: Bouchoul, Nassim, Touati, Houcine, Fourré, Elodie, Clacens, Jean-Marc, Batonneau-Gener, Isabelle, Batiot-Dupeyrat, Catherine
Format: Article
Language:English
Subjects:
Alumina
Aluminum oxide
Carbon dioxide
Catalysis
Chemical properties
Chemical Sciences
Conversion
Dry reforming
Methane
Non-thermal plasma
Physicochemical properties
Plasma jets
Reforming
Roasting
Synthesis gas
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Summary:[Display omitted] •Macro-mesoporous alumina was synthesized and tested in the DR of methane under DBD.•Alumina with the lowest surface area (65 m2  g−1) exhibits the highest activity.•Conversion favored with Al2O3 possessing the highest number of acid and basic sites.•CH4 and CO2 adsorption is improved under plasma discharge over acid and basic sites. Macro-mesoporous alumina, calcined at different temperatures (from 400 to 800 °C), were tested in dry reforming of methane reaction under plasma discharge at a fixed deposited power (P = 8 W) with a ratio CO2/CH4 = 2. Besides alumina materials, the one possessing the lowest surface area (72 m2  g−1) exhibited the highest activity: Methane conversion reaches 31.3 % against 23.4, 22.6 and 26.8 % for alumina calcined at 400, 600 and 800 °C, respectively, suggesting that the active sites generated into the mesoporosity of alumina (Al2O3 400) are not accessible to reactants under the plasma discharge. Reactant transformation is promoted with the alumina possessing the highest number of acid and basic sites and a correlation is proposed. It is believed that CH4 and CO2 adsorption are improved over acid and basic sites at the surface of alumina, favoring the production of syngas.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2021.120262