Citation: Yeying Huang, Tingcheng Li, Qingliang You, Xiangqian You, Qian Zhang, Daohong Zhang, Guangyong Xie. Solvothermal synthesis and characterization of nanocrystalline vanadium-chromium composite oxides and catalytic ammoxidation of 2,6-dichlorotoluene[J]. Chinese Journal of Catalysis, ;2018, 39(11): 1814-1820. doi: 10.1016/S1872-2067(18)63119-5 shu

Solvothermal synthesis and characterization of nanocrystalline vanadium-chromium composite oxides and catalytic ammoxidation of 2,6-dichlorotoluene

a Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, South-Central University for Nationalities, Wuhan 430074, Hubei, China;
b Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan 430056, Hubei, China

Received Date: 12 April 2018
Revised Date: 1 June 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (21172269), Innovation Group of Hubei Natural Science Foundation (2018CFA023) and Opening Project of Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University (JDGD-201809).

Vanadium-chromium oxides (VCrO) were usually prepared by high-temperature solid-state reactions; however, mixed phases were frequently produced and the morphology of the products was not well controlled. In this work, we prepared amorphous VCrO precursors by using V₂O₅ and CrO₃ and alcohols or mixtures of alcohol and water via solvothermal reaction at 180℃. The precursors were then calcined under nitrogen at various temperatures. The products were characterized by powder X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. It was revealed that pure-phase nanocrystalline orthorhombic CrVO₄ was obtained when methanol or methanol/water was used as the solvothermal medium and the precursor was calcined at 700℃. The size of the CrVO₄ crystals was around 500 nm when methanol was used, whereas it reduced significantly to less than 50 nm when a mixture of methanol and water was used. The sizes could be effectively tuned from 10 to 50 nm by varying the methanol/water volume ratio. To the best of our knowledge, this is the first report on the synthesis of pure-phase CrVO₄ nanocrystals. The nano-CrVO₄ showed almost the highest catalytic activity for the ammoxidation of 2,6-dichlorotoluene to 2,6-dichlorobenzonitrile among the reported bi-component composite oxides, owing to its smaller particle size, larger specific surface area, and more exposed active centers.
- CrVO₄,
- Nanocrystalline material,
- Composite oxide,
- Solvothermal synthesis,
- Ammoxidation
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