Caudillo-Flores U, Sayago R, Ares-Dorado A, Fuentes-Moyado S, Fernández-García M, Kubacka A. Green Thermo-Photo Catalytic Production of Syngas Using Pd/Nb-TiO
2 Catalysts.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2023;
11:3896-3906. [PMID:
36911875 PMCID:
PMC9993398 DOI:
10.1021/acssuschemeng.2c07285]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 01/23/2023] [Indexed: 06/18/2023]
Abstract
In this contribution, a series of Pd-promoted Nb-doped titania samples were essayed in the gas-phase thermo-photo production of syngas from methanol/water mixtures. The Pd loading was tested in the 0.1 to 2.5 wt % range, leading to the presence of metallic nanoparticles under reaction. Reaction rates exceeding 52 mmol H2 g-1 h-1 and quantum efficiencies above 33% were obtained. The optimum sample having a 0.5 wt % of Pd provided an outstanding synergy between light and heat under reaction conditions, facilitating the boost of activity with respect to the single-source processes and achieving high selectivity to syngas. The spectroscopic analysis of the physico-chemical ground of the activity unveiled that the noble metal interaction with the Nb-doped anatase support triggers a cooperative effect, promoting the evolution of formic acid-type methanol-derived carbon-containing species and rendering a significant enhancement of syngas production. The proposed thermo-photo system is thus a firm candidate to contribute to the new green circular economy.
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