Hydrodeoxygenation of 2,5-Dimethyltetrahydrofuran over Bifunctional Pt-Cs 2.5 H 0.5 PW 12 O 40 catalyst in the gas phase: enhancing effect of gold Hanan Althikrallah 1,2 , Elena F. Kozhevnikova 1 , Ivan V. Kozhevnikov 1 1 University of Liverpool, UK, 2 King Faisal University, Saudi Arabia Biomass-derived furanic compounds are a low-cost renewable feedstock that could be applied to produce value-added chemicals, which can boost the supply of green energy. 2,5-Dimethylfuran (DMF) and 2,5-dimethyltetrahydrofuran (DMTHF) are recognised as important intermediates within bio-oil upgrading transformation. However, furanic compounds have a high content of oxygen, which influences their acidity, homogeneity, polarity, and heating value. Bifunctional metal-acid catalysts could promote furan ring-opening and oxygen removal in the hydrodeoxygenation (HDO) upgrading process. Moreover, there has been a continued interest in bimetallic catalysis since the discovery of superior properties of bimetallic catalysts in petrochemistry and petroleum reforming. Bimetallic PtAu and PdAu catalysts have an enhanced performance in comparison to monometallic Pt and Pd catalysts. Here we looked at the effect of Au on the performance of Pt-CsPW catalysts in the HDO of DMTHF in the gas phase. In this work, 2,5-Dimethyltetrahydrofuran is deoxygenated to n-hexane with >99% selectivity at mild conditions (90 o C, 1 bar H 2 pressure, fixed-bed reactor) in the presence of bifunctional metal-acid catalyst Pt–CsPW comprising Pt and Cs 2 . 5 H 0.5 PW 12 O 40 (CsPW), an acidic Cs salt of Keggin-type heteropoly acid H 3 PW 12 O 40 . Addition of gold to the Pt–CsPW catalyst increases the turnover rate at Pt sites more than two-fold, whereas the Au alone without Pt is not active. The enhancement of catalyst activity is attributed to PtAu alloying, which is supported by STEM-EDX and XRD analysis. References 1. Althikrallah, E. F. Kozhevnikova and I. V. Kozhevnikov, Chem. Commun., 2021, 57, 227–230. 2. Althikrallah, E. F. Kozhevnikova and I. V. Kozhevnikov, Mol. Catal., 2021, 510, 111711. Alazman, D. Belic, E. F. Kozhevnikova and I. V. Kozhevnikov, J. Catal., 2018, 357, 80–89. 3. Poole, K. Alharbi, D. Belic, E. F. Kozhevnikova and I. V. Kozhevnikov, Appl. Catal., B, 2017, 202, 446–453
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