Abstract:
Carbohydrates are considered as an economical and green source of energy; however, the high oxygen
content present in carbohydrates makes them non-attractive as a fuel/fuel additives. Here, a simple
multi-functional catalyst, CePO4, is presented for the efficient conversion of various carbohydrates
(fructose, glucose, sucrose, and starch) into 5-hydroxymethylfurfural (HMF). To improve the catalytic
activity of CePO4, especially for glucose and starch conversion, CePO4 is supported on the surface of an
H-beta zeolite. CePO4 and CePO4 supported on the H-beta zeolite are thoroughly characterized using
powder X-ray diffraction, N2-sorption, electron microscopy, X-ray photoelectron spectroscopy, Fourier
transform infrared spectroscopy, pyridine adsorbed Fourier transform infrared spectroscopy, and NH3
temperature programmed desorption techniques. The carbohydrate to HMF conversion is demonstrated
in a water–diglyme solvent mixture. Moreover, CePO4 exhibits very good activity for the selective
oxidation of HMF to 2,5-diformylfuran in O2 at one atmospheric pressure under flow conditions. The
catalytic activity of CePO4 is further explored for g-valerolactone production from levulinic acid by using
2-propanol as the hydrogen source. One simple reusable CePO4 catalyst catalyzing three different
reactions under different reaction conditions is interesting and certainly would attract industrial chemists
and catalysis researchers
