Citation:
WU Jinming, SHI Lei, SHEN Aibao, TANG Yanfeng, LU Tianhong. Selective Nitration of Phenols via H6Pmo9V3O40/SiO2 Catalysts[J]. Chinese Journal of Applied Chemistry,
;2014, 31(4): 437-443.
doi:
10.3724/SP.J.1095.2014.30261
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To establish a clean and efficient nitration process of phenolic compounds,heteropolyacid H6PMo9V3O40(PMAV3) and chromatographic silica gel were respectively chosen as active component and carrier for the preparation of a series of supported catalysts(PMAV3/SiO2) via the conventional impregnation method.The catalysts were characterized by Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD),N2 adsorption-desorption and thermogravimetry-differential scanning calorimetry(TG-DSC).The catalytic performance of catalysts was evaluated for the nitration of phenols.The results reveals that PMAV3/SiO2 exhibits excellent catalytic activity and regioselectivity for the nitration of phenols,the nitration yield is in the range of 83.7%~94.5%.For salicylic acid,the para-selectivity is nearly 100%,but for phenol,2-methylphenol,2-chlorophenol and 2-fluorphenol,the ortho-selectivity is observed.The textural properties of PMAV 3/SiO2 are close to that of PMAV3,but BET of the supported catalysts is decreased with the rise of PMAV 3 loading.PMAV3/SiO2 shows better thermal stability than PMAV3.The catalyst can be recovered easily and reused for five times without noticeable drop in activity.
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Keywords:
- catalyst,
- heteropolyacid,
- H6Pmo9V3O40,
- silica gel,
- nitration,
- phenolic compound
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