Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (6): 1826.doi: 10.7503/cjcu20200888

• Physical Chemistry • Previous Articles     Next Articles

One-step Synthesis of Amorphous Silica Aluminum Support Materials with Controllable Acidity and Porosity and Catalytic Performance of Their Pd-based Catalysts

WANG Yuxiang1, YU Shen1, LIU Zhan1, LYU Jiamin1, LI Xiaoyun2, CHEN Lihua1(), SU Baolian1,3()   

  1. 1.State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China
    2.State Key Laboratory of Silicate Material for Architectures,Wuhan University of Technology,Wuhan 430070,China
    3.Laboratory of Inorganic Materials Chemistry(CMI),University of Namur,Namur B? 5000,Belgium
  • Received:2020-12-23 Online:2021-06-10 Published:2021-06-08
  • Contact: CHEN Lihua,SU Baolian E-mail:chenlihua@whut.edu.cn;bao-lian.su@unamur.be
  • Supported by:
    the National Natural Science Foundation of China(21805216)

Abstract:

The catalytic performance of porous material-supported catalysts depends significantly on the acidity and porosity of support materials. One of the most critical challenges in the field of support-based catalysts is to effectively control the acidity and porosity of support materials simultaneously. Herein, we synthesized a series of porous amorphous silica aluminum(ASA) support materials by a spontaneous self-assembly process in different solvents. Further, porous ASA supported Pd catalysts were prepared by an impregnation method. Particularly, the effects of the polarity of solvent and the initial Si/Al ratio of ASA on the support materials as well as the obtained catalyst were investigated thoroughly. Results show that synthesis in a solvent with lower polarity produces ASA materials possessing abundant mesopores. And by means of tuning initial Si/Al ratio, the acidity, BET surface area, and pore size of ASA materials can be controlled readily. The optimal synthesis condition achieves a BET surface area and total acid amount up to 349.6 m2/g and 1.389 mmol/g, respectively. Due to the high BET surface area and abundant mesopores, the as-prepared ASA-supported Pd catalyst exhibits high dispersion of Pd metal particles, the dispersion of Pd is up to 63.17%. As a result, the obtained catalyst outperforms excessively its counterpart supported on commercial Al2O3, achieving a conversion of 99.75% and a selectivity to phenylamine of 94.62% for the hydrogenation of nitrobenzene and a conversion of 40.61% and a selectivity to benzaldehyde of 38.09% for the oxidation of benzyl alcohol. This facile and effective synthesis method makes it possible to synthesize efficient catalysts according to desired catalytic reactions.

Key words: Amorphous silica aluminum, Mesoporous structure, Noble metal Pd, Catalysis

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