Solar-driven thermo-photocatalytic CO2 methanation over a structured RuO2:TiO2/SBA-15 nanocomposite at low temperature

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Paulista, LO (Author) Other; Alexandre Ferreira (Author) FEUP; Castanheira, B (Author) Other; Dolic, MB (Author) Other; Martins, RJE (Author) Other; Boaventura, RAR (Author) Other; Vitor Vilar (Author) FEUP; Silva, TFCV (Author) Other

Journal

Title: Applied Catalysis B: Environmental

Vol. 340

ISSN: 0926-3373

Publisher: Elsevier

Indexing

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Other information

Authenticus ID: P-00Z-0V6

DOI: 10.1016/j.apcatb.2023.123232

Abstract (EN): A new hybrid catalyst composed of mesostructured silica SBA-15 functionalized with TiO2 and further loaded with RuO2 was developed to efficiently promote thermo-photocatalytic CO2 hydrogenation into methane at low temperatures. The catalytic activity was assessed with respect to TiO2:RuO2 loading, catalyst dosage, illumination source (polychromatic sunlight and monochromatic LEDs) and power, [H-2]:[CO2] molar ratio, temperature, and catalyst reusability. The best methanation yields were attained for the RuO2(6.4%):TiO2(16.9%)/SBA-15 nanocomposite at 150 C-o, under simulated sunlight (0.21 W) and stoichiometric [H-2]:[CO2] molar ratio, reaching: a specific CH(4 )production rate of 13.6 mmol gcat(-1) h(-1); 99.8 % selectivity; 96.8 % CO2 conversion (110min; 40 mL); and apparent photonic efficiency/quantum yield of 39.5 %/42.1 %. Considering only the active RuO2:TiO2 photocatalyst mass (23.3 %), the CH4 production rate increased to 58.6 mmol g(active_cat )(-1 )h(-1) this highly-active photocatalyst featured excellent UV-Vis-IR light absorbance, high surface area, and stability for reuse when moist gas was removed between cycles.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 25