Abstract：Base-free oxidation of glycerol over carbon nanotubes supported Pt catalysts (Pt/CNTs) was carried out in a trickle-bed reactor, aiming to improve the stability of the catalyst and the yield of target product. The fresh and used catalysts were characterized by means of thermal gravimetric analysis, high resolution transmission electron microscopy and X-ray photoelectron spectroscopy. The operating conditions, such as flow rates of glycerol and oxygen, reaction temperature and initial glycerol concentration were also optimized for higher yield of glyceric acid. The results showed that the catalysts tested in the trickle-bed reactor exhibit high stability, which was mainly due to relatively low amount of products adsorbed, little reduction in Pt binding energy, no obvious aggregation of Pt particles and almost no leaching of Pt. Under optimal reaction conditions with glycerol flow rate of 0.10 cm3/min, oxygen flow rate of 20.0 cm3/min, reaction temperature of 60.0 ℃ and initial glycerol mass fraction of 10.0%, a yield of glyceric acid larger than 55% can be obtained with a glycerol conversion higher than 80%.
WANG Jingnan,LING Xiang,DUAN Xuezhi et al. Continuous Catalytic Oxidation of Glycerol to Glyceric Acid in a Trickle-Bed Reactor[J]. 化学反应工程与工艺, 2020, 36(1): 1-7.
