NDLI: H3PW12O40/mpg-C3N4 as an efficient and reusable bifunctional catalyst in one-pot oxidation

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhao, Meng Wang, Yanji Wang, Cunyue Yang, Yongfang Wang, Hefang
Copyright Year	2017
Abstract	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.
Starting Page	405
Ending Page	417
Page Count	13
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	7
Issue Number	2
Journal	Catalysis Science & Technology
DOI	10.1039/c6cy01669c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Infrared spectroscopy Bifunctional catalyst Thermogravimetric analysis Knoevenagel condensation Dispersion relation Fourier-transform infrared spectroscopy Photoemission spectroscopy Benzyl alcohol Scanning electron microscope Graphitic carbon nitride X-ray crystallography Mesoporous material Ammonia Transmission electron microscopy Carboxylic acid Malononitrile Nitride Nuclear magnetic resonance Benzylidene compounds X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Catalysis

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