(560y) Catalytic Transfer Hydrogenolysis of Xylitol over Bifunctional Pd-Based Catalysts
Taking xylitol as a model compound, in this work, we have designed a series of bimetallic Pd-Cu, Pd-Ni, Pd-Pt and Ni-Cu catalysts and confirmed their remarkable performances in CTH reactions to 1,2-PDO, EG and lactic acid. Based on experimental results, it is found that bimetallic Pd-Pt catalysts supported on TiO2 has obvious superior CTH performances by comparing the conversion and products distribution to monometallic Pd and Pt under identical conditions. In particular, at nearly 100% xylitol conversion, a selectivity of 41.1% to EG and 1,2-PDO was obtained on Pd-Pt/TiO2 at 220 oC, 1.0 MPa nitrogen atmosphere in absence of external H2. In contrast, the main product of hydrogenolysis of xylitol on monometallic Pd/TiO2 was lactic acid with the low conversion. Similarly, monometallic Pt/TiO2 catalyst shows strong tendency for C-C breaking. In our presentation, the structural properties including effect of particle size on catalytic activity and selectivity will be systematically studied, with the aim to establish structure-activity correlations for C-C and C-O cleavage of xylitol during CTH process.
 Sun, J. Y.; Liu, H. C. Green Chemistry 2011, 13 (1), 135-142.
 Riviere, M.; Perret, N.; Cabiac, A.; Delcroix, D.; Pinel, C.; Besson, M. Chemcatchem 2017, 9 (12), 2145-2159.
 Jin, X.; Shen, J.; Yan, W.; Zhao, M.; Thapa, P. S.; Subramaniam, B.; Chaudhari, R. V. ACS Catalysis 2015, 5 (11), 6545-6558.
 Liu, H. L.; Huang, Z. W.; Kang, H. X.; Li, X. M.; Xia, C. G.; Chen, J.; Liu, H. C. Applied Catalysis B-Environmental 2018, 220, 251-263.