Solar thermo-photocatalytic methanation using a bifunctional RuO2:TiO2/ Z13X photocatalyst/adsorbent material for efficient CO2 capture and conversion

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

Authors

Paulista, LO (Author) Other; Alexandre Ferreira (Author) FEUP; Rodrigues, AE (Author) Other; Martins, RJE (Author) Other; Boaventura, RAR (Author) Other; Vitor Vilar (Author) FEUP; Tânia Silva (Author) FEUP

Journal

Title: Journal of Environmental Chemical Engineering

Vol. 12

ISSN: 2213-3437

Publisher: Elsevier

Indexing

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Associated Projects

LA LSRE-LCM - Financiamento Plurianual 2020-2023 para a Unidade LA LSRE-LCM Laboratório de Processos de Separação e Reacção - Laboratório de Catálise e Materiais

Other information

Authenticus ID: P-010-4TB

DOI: 10.1016/j.jece.2024.112418

Abstract (EN): A novel bifunctional photocatalyst/adsorbent material based on the RuO2:TiO2/zeolite 13X (Z13X) composite was developed to enhance solar -driven methanation through simultaneous carbon dioxide (CO2) capture and thermo-photoconversion. The activity/stability of the hybrid material towards methane (CH4) production was assessed by varying the (i) photocatalyst composition (Ru load and semiconductor type), (ii) bifunctional material composition (photocatalyst-to-zeolite ratio) and impregnation method, (iii) illumination source and power (simulated sunlight and UVA/Visible LEDs), (iv) temperature, and (v) catalyst reuse. Additionally, adsorption equilibrium isotherms were determined to characterize the adsorption ability of the bifunctional material for both CO2 and CH4 gases. The hybrid RuO2(4.0%):TiO2(26.3%)/Z13X material (30 mg), synthesised by the solid-state impregnation method, showed the best results under simulated sunlight (0.75 W) at 150 degrees C, achieving a 88% CO2 thermo-photoreduction after 100 min, corresponding to a specific CH4 production of 29.2 mmol gactive_cat - 1 h-1 (309 mmol gRu- 1 h-1) and apparent quantum yield of 20.7%. In adsorption equilibrium isotherms, the bifunctional material's adsorption was about 2.6 -fold higher than the photocatalyst at 150 degrees C, suggesting that enhanced methanation performance can be attributed to the synergistic action of CO2 capture and thermophotoconversion.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 19