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Effect of the metal-support interaction on catalytic oxidation performances of HMF on Ag nanoparticles(PDF)

Journal of Forestry Engineering[ISSN:2096-1359/CN:32-1862/S]

2020 No.06
Research Field:
林产化学加工 执行主编:王飞 张美云
Publishing date:


Effect of the metal-support interaction on catalytic oxidation performances of HMF on Ag nanoparticles
XIA Haian1 AN Jiahuan1 ZHANG Weizi1 GE Chaoqi2 ZUO Songlin1
1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China;2. Nanjing Tech University, Nanjing 211816, China
HMF HMFCA selective oxidation d-band center support
The increasing demand for energy has become a huge challenge for the worldwide environmental protection. It is an important way for the valorization of abundant and inexpensive biomass resources to alleviate the demand for fossil resources. The 5hydroxymethyl furoic acid (HMFCA), one of the platform chemicals, has been rarely studied and the yield is low at present. Noble metal catalysts are commonly used for the oxidation of 5hydroxymethylfurfural (HMF) to produce 2,5furandicarboxylic acids, such as Pt, Pd, Au, Ru, etc., but these noble metal catalysts are expensive and very difficult to produce HMFCA with high yield because HMFCA is only an oxidized intermediate and prone to be further oxidized to FDCA. Therefore, it is urgent to develop a relatively cheap and novel metal catalyst to selectively oxidize HMFCA with high activity and high desired product yield. It is wellknown that the metalsupport interaction has a remarkable effect on the catalytic performances and the role of the catalyst support in the catalytic reaction cannot be neglected. In this study, silver nanoparticles supported over various supports including ZrO2, Al2O3, TiO2, CeO2, and AC, were fabricated. The surfaceinterface properties of the catalysts were characterized by the Xray diffraction (XRD), Xray photoelectron spectroscopy (XPS), and Highresolved Transmission Electron Microscopy (HRTEM). The results showed that the properties of the supports had a profound influence on the particle size and electronic configuration of Ag nanoparticles, thereby affecting the aerobic oxidation performance of HMF, and the sequence of activity was as follows: Ag/ZrO2 > Ag/Al2O3 > Ag/TiO2 > Ag/CeO2 > Ag/AC. In addition, although the particle size (about 9.6 nm) of Ag/ZrO2 was similar to that of Ag/AC (about 10.5 nm), the activity of Ag/ZrO2 was much higher than that of Ag/AC. The results showed that there was a good linear relationship between the oxidation activity of HMF and the content of Ag0 on the surface of Ag nanoparticles, indicating that the active site for HMF oxidation was mainly Ag0 species on the surface. The Ag0 content of Ag/ZrO2 catalyst was the highest, and that of Ag/AC was the lowest. This could be due to the fact that various supports resulted in the different metalsupport interaction, which affected the Ag0 content on the surface of Ag nanoparticles.



Last Update: 2020-11-11