一步液滴法合成酸性和孔道属性可调的硅铝酸盐载体及其Pd基催化剂的性能研究

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

Yuxiang Wang, Shen Yu, Zhan Liu, Jiamin Lyu, Xiaoyun Li, Lihua Chen, Baolian Su

Research output: Contribution to journalArticlepeer-review

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.

Translated title of the contributionOne-step Synthesis of Amorphous Silica Aluminum Support Materials with Controllable Acidity and Porosity and Catalytic Performance of Their Pd-based Catalysts
Original languageChinese (Traditional)
Pages (from-to)1826-1836
Number of pages11
JournalGaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities
Volume42
Issue number6
DOIs
Publication statusPublished - 10 Jun 2021

Keywords

  • Amorphous silica aluminum
  • Catalysis
  • Mesoporous structure
  • Noble metal Pd

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