Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (8): 20230059.doi: 10.7503/cjcu20230059

• Physical Chemistry • Previous Articles     Next Articles

Effect of Acid Property Regulation on the Performance of Pd/MIL-100(Cr) Catalyzed One-step Oxidation of Benzyl Alcohol to Acetal

LI Zipeng1,2, GENG Jiaxin2, LIU Yingya1,2(), SUN Zhichao1,2, WANG Yao2, WANG Anjie1,2()   

  1. 1.State Key Laboratory of Fine Chemicals
    2.School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China
  • Received:2023-02-14 Online:2023-08-10 Published:2023-04-14
  • Contact: LIU Yingya, WANG Anjie E-mail:yingya.liu@dlut.edu.cn;ajwang@dlut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22271038);the National Key Research and Development Program of China(2016YFE0109800)

Abstract:

MIL-100(Cr) was hydrothermally synthesized and used as a solid-acid catalyst support. Pd nanoparticles were impregnated on MIL-100(Cr) by a double-solvent approach followed by hydrogen reduction to obtain Pd/MIL-100(Cr). One-step tandem conversion of benzyl alcohol to acetal was selected as a model reaction, and the influence of acid property of MIL-100 on the product distribution was investigated. The results showed that Pd/MIL-100(Cr) catalyzed tandem reaction could accelerate the benzyl alcohol oxidation, and different reduction and activation temperatures had an impact on the acid properties of MIL-100(Cr), which in turn affected the selectivity of acetal. The acid properties were characterized by pyridine adsorption infrared spectroscopy(Py-FTIR) and temperature programmed desorption of ammonia(NH3-TPD), the result showed that increasing the catalyst treatment temperature, the L acid sites increased, the B acid sites decreased, and the B acid sites was beneficial to improve the selectivity of acetal. Under optimal conditions, a benzyl alcohol conversion of 99.9% and acetal selectivity of 76.2% can be achieved at 70 ℃ in 12 h. X-ray photoelectron spectroscopy(XPS) analysis was used to characterize the electronic properties of the Pd species and the MIL-100(Cr), the cycling stability of the catalyst was investigated, and the reasons for the deactivation of the catalyst were analyzed by powder X-ray diffraction(XRD), scanning electron microscopy(SEM), N2 adsorption-desorption isotherms and NH3-TPD.

Key words: MIL-100(Cr), Pd, Benzyl alcohol, Acetal, Tandem reaction

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