期刊
KOREAN JOURNAL OF CHEMICAL ENGINEERING
卷 38, 期 5, 页码 966-974出版社
KOREAN INSTITUTE CHEMICAL ENGINEERS
DOI: 10.1007/s11814-021-0754-z
关键词
12 Tungstophosphoric Acid (HPW); KIT-6; Esterification; Impregnated; Sol-gel
资金
- National Research Foundation of Korea [NRF-2020R1I1A1A01072793]
- Department of Chemical Engineering COMSATS University Islamabad, Lahore Campus
- School of Environmental Engineering University of Seoul, South Korea
This study aimed at synthesizing heterogeneous acid catalysts by incorporating HPW over mesoporous silica support KIT-6 using impregnation and sol-gel methods to improve catalytic efficiency. The KIT-6 supported catalysts showed improved catalytic stability and activity due to the ordered structure of mesoporous silica facilitating the dispersion of HPW. Catalysts synthesized by impregnation and sol-gel methods, particularly 30-IM and 25-SG, exhibited the highest catalytic activity, attributed to the improved textural property and amount of HPW, leading to enhanced performance in terms of activity, stability, and reusability.
This study aimed at the synthesis of heterogeneous acid catalysts by incorporating 12 tungstophosphoric acid (HPW) over mesoporous silica support KIT-6 via impregnation and sol-gel methods to improve the catalytic efficiency of the esterification reaction. The catalytic activity of the KIT-6 supported catalysts was investigated for esterification of oleic acid in the presence of MeOH. Synthesized catalysts were analyzed using scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and Fourier transform infrared (FTIR) spectroscopy techniques. Characterization results showed the variation in porosity, roughness, presence of SiO2 and kegging structure after successful deposition of HPW over KIT-6 surface. Additionally, the textural property of synthesized catalysts was compared with highly active HPW and sulfated KIT-6. The ordered structure of mesoporous silica KIT-6 facilitated the dispersion of HPW resulting in better catalytic stability and activity. To evaluate the impact of synthesizing technique on catalytic activity and effectiveness of heterogeneous acid catalysts, loading of HPW over KIT-6 mesoporous silica was controlled between 10 to 30 wt%. Catalysts synthesized by impregnation and sol-gel methods showed the highest catalytic activity with 30-IM and 25-SG, respectively. The enhanced performance was ascribed to the improved textural property and amount of HPW, which led to higher activity, stability and reusability.
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