Tuning charge transfer of Pt cluster by support defects in Pt/TiO2 for photocatalytic conversion of fatty acid into diesel-like alkane. (15th November 2022)

• Record Type: Journal Article
• Authors: Long, Feng; Cao, Xincheng; Liu, Peng; Jiang, Xia; Jiang, Jianchun; Zhang, Xiaolei; Xu, Junming
• Is Part Of: Journal of cleaner production. Volume 375(2022)
• Publication Date: 2022-11-15
• Subjects: Photocatalytic -- Pt/TiO2 -- Oxygen vacancy -- Density functional theory calculation -- H spillover; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.133975
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Efficient deoxygenation for the bio-derived fatty acid is paramount to producing diesel-like alkane and usually requires harsh reaction conditions. Here, we reported an efficient conversion system for the photocatalytic conversion of fatty acid over Pt/TiO2 catalysts and acid conversion higher than 99.0% (yield nearly 84.5%) under the mild conditions 30 °C, 0.1 MPa H2, and 365 nm light. X-ray photoelectron spectroscopy (XPS) and Density Functional Theory (DFT) calculations suggest that the oxygen vacancies TiO2 can achieve the charge transfer from TiO2 support to Pt clusters. The electron-rich Pt cluster can promote hydrogen spillover to form a hydrogen-rich surface. Thus, it leads to the photo-decarboxylation Cn-1 alkyl radical being amenable to proton hydrogenation to produce Cn-1 alkane. Detailed characterization demonstrates that 0.50 wt% Pt/TiO2 has superior photocatalytic performance. Introducing the Pt atoms can promote the formation the oxygen vacancies and reverse charge transfer, which determines the acid adsorption and conversion mechanism. Graphical abstract: Image 1 Highlights: Pt/TiO2 photocatalytic conversion of fatty acid with alkane yields 84.5% and selectively 99.0%. The charge can be transferred from TiO2 support into Pt cluster in Pt/TiO2 -Ov system. Negative Pt cluster promotes H* spillover to form a hydrogen-rich surface to proton hydrogenation. The photocatalytic hydrogenation mechanism of carboxyl derivatives was proposed.