Catalysis science and technology p. 405 - 417 (2017)
Update date:2022-08-11
Topics:
Wang, Hefang
Wang, Cunyue
Yang, Yongfang
Zhao, Meng
Wang, Yanji
A single-site bifunctional catalyst for the oxidation-Knoevenagel condensation tandem reaction was prepared by the immobilization of phosphotungstic acid (HPW) on mesoporous graphitic carbon nitride (mpg-C3N4) via electrostatic interaction (HPW/mpg-C3N4). The results of Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), solid-state 31P nuclear magnetic resonance (solid-state 31P NMR), zeta potentials, X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA) demonstrated that HPW was successfully immobilized on the protonated mpg-C3N4 by electrostatic interaction. The acid amounts of the catalysts were determined by NH3 temperature programmed desorption (NH3-TPD). The textural properties and morphology of HPW/mpg-C3N4 were characterized by N2 adsorption-desorption, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). 30% HPW/mpg-C3N4 shows the best catalytic performance in the tandem reaction with 98.4% benzyl alcohol conversion and 96.2% selectivity to benzylidene malononitrile. The excellent catalytic performance of 30% HPW/mpg-C3N4 in the tandem reaction is due to the good catalytic performance of HPW in the oxidation and Knoevenagel condensation, respectively. Furthermore, protonated mpg-C3N4 not only acts as a support to facilitate good dispersion of HPW but also promotes the Knoevenagel condensation reaction effectively. Moreover, the HPW/mpg-C3N4 catalyst could be recycled easily without significant loss of catalytic activity.
View MoreContact:15973022782
Address:7-5-6218,Incubation Centre,Guandong Industry Park, East Lake High-Tech Development Zone,Wuhan City.
guide(suzhou) fine materials co. ltd
Contact:0512-80972173
Address:21st Building, No.369 Lushan Rd, New District Suzhou China 215129
Feis International Trade Co,. Ltd
Contact:13961823444-18235944442
Address:Wuxi jiangsu
shanghai jiuling chemical co.,ltd.
Contact:+86-21-50387295
Address:Zaozhuang Road, Pudong, Shanghai City. China
website:http://www.u-chemo.com
Contact:+86-21-61558312
Address:Dong Fang Road,
Doi:10.1007/s11172-005-0107-9
(2004)Doi:10.1016/0022-328X(84)85055-X
(1984)Doi:10.1021/jo01074a630
(1960)Doi:10.1016/0003-2670(56)80149-9
(1956)Doi:10.1016/j.ejmech.2018.04.042
(2018)Doi:10.1016/S0957-4166(97)00465-5
(1997)