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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 shu

Selective Nitration of Phenols via H₆Pmo₉V₃O₄₀/SiO₂ Catalysts

WU Jinming ^a ,
SHI Lei ^a ,
SHEN Aibao ^a,, ,
TANG Yanfeng ^a ,
LU Tianhong ^b,c

1.
a School of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, China;
2.
b Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Material Science, Nanjing Normal University, Nanjing 210097, China;
3.
c Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 226019, China

Corresponding author: SHEN Aibao,
Received Date: 22 May 2013
Available Online: 12 August 2013
Fund Project: 国家自然科学基金(21173122) (21173122)江苏省高校自然科学基金(11KJD530001)资助项目 (11KJD530001)

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.
- catalyst,
- heteropolyacid,
- H₆Pmo₉V₃O₄₀,
- silica gel,
- nitration,
- phenolic compound
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Selective Nitration of Phenols via H₆Pmo₉V₃O₄₀/SiO₂ Catalysts