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 contribution||One-step Synthesis of Amorphous Silica Aluminum Support Materials with Controllable Acidity and Porosity and Catalytic Performance of Their Pd-based Catalysts|
|Original language||Chinese (Traditional)|
|Number of pages||11|
|Journal||Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities|
|Publication status||Published - 10 Jun 2021|
- Amorphous silica aluminum
- Mesoporous structure
- Noble metal Pd
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Technological Platform Physical Chemistry and characterization
Facility/equipment: Technological Platform