Journal
CATALYSIS TODAY
Volume 319, Issue -, Pages 105-112Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2018.05.049
Keywords
5-Hydroxymethylfurfural; 2,5-Diformyfuran; Manganese oxide; Titanium oxide; Anatase/rutile ratio
Funding
- National Natural Science Foundation of China (NSFC) [21476084, 21576081, 21776074]
- PetroChina Innovation Foundation
- 111 Project [B08021]
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A series of MnOx/P25 (TiO2) catalysts were prepared by a simple impregnation method and evaluated for the selective oxidation of 5-hydroxymethylfurfural (HMF) into 2,5-diformyfuran (DFF). The as-prepared catalysts were characterized by N-2 adsorption/desorption isotherms, transmission electron microscope (TEM), X-ray powder diffraction (XRD), hydrogen temperature-programmed reduction (H-2-TPR), Raman, and thermogravimetric analysis. The surface anatase-rutile structure of P25 can be tuned via calcination at different temperature for different time and has significant effects on the catalytic activity of MnOx/P25 for HMF oxidation. The results reveal that MnOx supported on P25 pretreated at 600 degrees C for 5 h (MnOx/P25-600-5 h) shows the best catalytic performance achieving 33.2% HMF conversion along with 97.0% selectivity to DFF in a two-hour reaction time. The catalytic activity of MnOx/P25-600-5 h is almost twice higher than untreated MnOx/P25 catalyst, attributing to the optimized surface structures of anatase/rutile ratio (1.83). In addition, the effects of MnOx loadings, reaction time and temperature of the catalysts for HMF oxidation were also investigation. Furthermore, the MnOx/P25-600-5 h catalyst can be used for five consecutive runs without significant loss of its catalytic activity.
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