Gas Phase Ammoxidation of meta-Xylene to Isophthalonitrile over V-Ce Composite Oxides
1. School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2. State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
Abstract：Environmental friendly and Cr-free composite oxide catalysts with different Ce/V ratios were prepared through spray drying method. The effect of Ce/V ratio and the addition of Mo on the ammoxidation performance of the catalysts were investigated in a fluid bed reactor. The structure of the catalysts was characterized by X-ray diffraction (XRD), Raman spectra, H2 temperature programmed reduction (H2-TPR), NH3 temperature programmed desorption (NH3-TPD) and X-ray photoelectron spectroscopy (XPS). The characterization results showed that the catalysts consisting of CeVO4 crystal phase played a key role in improving the yield of isophtalonitrile (IPN). With the increase of Ce/V ratio, the CeO2 crystal phase appeared gradually, and the selectivity of the main product IPN decreased. The surface acid site of the V-Ce composite oxide catalysts was mainly weak site. The V1Ce0.8/SiO2 sample exhibited the best catalytic performance among the four catalysts with different Ce/V ratios, with IPN yield of 60.0%. Moreover, the addition of Mo promoter into the V1Ce0.8/SiO2 sample could suppress the COx formation and further improve the gas-phase ammoxidation performance. The IPN yield could reach 62.5% when the Mo/V ratio was 0.10.
XI Pengbo1,2,FENG Bing2 et al. Gas Phase Ammoxidation of meta-Xylene to Isophthalonitrile over V-Ce Composite Oxides[J]. 化学反应工程与工艺, 2020, 36(3): 222-229.
