AUTHOR=Wang Yaju , Zhou Zhiming , Wang Chao , Zhao Leihong , Xia Qineng 

TITLE=Hydrogenolysis of glycerol over TiO2-supported Pt-WOx catalysts: Effects of the TiO2 crystal phase and WOx loading

JOURNAL=Frontiers in Chemistry

VOLUME=10

YEAR=2022

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2022.1004925

DOI=10.3389/fchem.2022.1004925

ISSN=2296-2646

ABSTRACT=<p>The selective hydrogenolysis of glycerol to 1,3-propanediol (1,3-PDO) with high added value is attraction but challenging. Pt-WO<sub>x</sub>-based catalysts have been extensively studied in the selective hydrogenolysis of glycerol. The catalyst support and the physicochemical state of WO<sub>x</sub> play important roles on this reaction. In this paper, Pt-WO<sub>x</sub> catalysts supported on TiO<sub>2</sub> with different crystal forms were prepared and studied for their catalytic performance in hydrogenolysis of glycerol. It was observed that the catalytic performance of anatase-type (A-type) TiO<sub>2</sub>-supported catalyst (Pt/W/A-Ti) is much better than that of the rutile-type (R-type) TiO<sub>2</sub> catalyst (Pt/W/R-Ti) due to its higher stability. Furthermore, the influence of W loading amount and state were thoroughly investigated for the Pt/W/A-Ti catalysts, and Pt/W/A-TiO<sub>2</sub> with 5 wt% loading of WO<sub>x</sub> achieved the best catalytic performance (100% conversion of glycerol and 41% yield of 1,3-PDO under the optimal reaction conditions), owing to the suitable WO<sub>x</sub> domains and high dispersion of W species, as evidenced by XRD patterns and TEM images. Mechanism study by <italic>in-situ</italic> DRIFTS experiments indicated that glycerol was first converted to 3-hydroxypropanal and then converted to 1,3-PDO through subsequent reactions.</p>