Citation:
LIU Lijun, CI Yingqian, WANG Qiliao, GONG Shuwen, CUI Qingxin. Selective Catalytic Nitration of Phenol to o-Nitrophenol by Silica Supported Cesium Salts of Molybdovanadophosphoric Acid[J]. Chinese Journal of Applied Chemistry,
;2014, 31(7): 817-822.
doi:
10.3724/SP.J.1095.2014.30463
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A series of silica supported cesium salts of molybdovanadophosphoric acid catalysts with different loadings was prepared by sol-gel technology.Their properties were verified by XRD,IR spectra,SEM and physical adsorption technology.The catalytic activity of these catalysts was evaluated for the liquid phase nitration of phenol with dilute nitric acid under mild conditions.The effects of various parameters on the nitration were tested,which included reaction time,catalyst loading and reactants ratio.The results indicate that the catalyst prepared has the Keggin type structure and these particles are well dispersed on the surface of silica.The catalysts exhibit strong activity and high selectivity toward the o-nitration of phenol with a yield of 88% under appropriate conditions.Moreover,the supported catalysts can be recovered simply and reused several times.After the nitration,the o-nitrophenol obtained can be extracted via steam distillation.
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Keywords:
- phenol,
- nitration,
- catalysis,
- o-nitrophenol
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