Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (4): 757.doi: 10.7503/cjcu20190594

• Physical Chemistry • Previous Articles     Next Articles

Palladium-based Nanocatalysts Supported on Polybenzoxazine for Aromatic Alcohol Oxidation

HAO Yan1,2,*(),YANG Hua2,WANG Xiang2,LI Qingyang2,ZHAO Pan2,TANG Qinghu2,SONG Shili2,XI Guoxi1,2   

  1. 1. College of Environment
    2. Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, College of Chemisty and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
  • Received:2019-11-18 Online:2020-04-10 Published:2020-01-15
  • Contact: Yan HAO E-mail:yanhao@htu.edu.cn
  • Supported by:
    † Supported by the Henan Province Natural Science Foundation, China(162300410175);the Key Scientific Research Project of Colleges and Universities in Henan, China(17A150031)

Abstract:

Carbon supported palladium-based nanocatalysts were synthesized via an impregnation-pyrolysis method, based on a spherical polybenzoxazine as support, owing to the interaction between nitrogen groups and metal nanoparticles. Transmission electron microscope(TEM) images of Pd/C catalyst showed that palladium nanoparticles were uniformly distributed over the support with an average size of about 3.5 nm. The cha-racterization results of Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS) and temperature programmed desorption(CO2-TPD) analysis, showed that a mount of nitrogen and oxygen functional groups existed on the support. The nitrogen and oxygen atoms might have interactions with Pd atoms, which could effectively immobilize palladium nanoparticles and obtain well dispersed palladium-carbon nanocatalysts. The bimetallic Pd-Au/C and Pd-Pt/C catalysts were prepared via the same method to further enhance the catalytic activity. The average particle size of Pd-Au and Pd-Pt nanoparticles were 4.3 and 4.2 nm, respectively, without an obvious agglomeration, which demonstrated the effective immobilization role of polybenzoxazine support. The catalysts were evaluated by the benzyl alcohol oxidation reaction at 80 ℃ and water as solvent. The Pd1-Au1/C catalyst exhibited the highest conversion of >98% within 2 h and the selectivity to benzaldehyde of >99%, revealing the excellent catalytic performances. Moreover, the catalyst could be used for several runs and easily regenerated by calcination. Furthermore, the catalyst could also oxidize aromatic alcohols with different substituents into corresponding aldehydes, such as 4-methyl benzyl alcohol, 4-methoxybenzyl alcohol, 2-methyl benzyl alcohol and so on, providing an excellent catalyst for aromatic alcohol oxidation.

Key words: Pd, Carbon material, Dispersion, Aromatic alcohol oxidation

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