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AssigneesChina Petroleum & Chemical Corporation, Sinopec Research Institute of Petroleum Processing Co., Ltd.
InventorsChangjiu XIA, Peng ZHANG, Xinxin PENG, Enhui XING, Xiaoxin ZHANG, Yibin LUO, Min LIN, Bin ZHU, Xingtian SHU
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A hierarchical porous all-silica molecular sieve is provided. The 31P MAS NMR spectrum of the molecular sieve shows three characteristic peaks at chemical shifts of −5±1 ppm, −34±1 ppm and −61±1 ppm, wherein the peak intensity of the characteristic peak at the chemical shift of −5±1 ppm is recorded as N1, the peak intensity of the characteristic peak at the chemical shift of −34±1 ppm is recorded as N2, and the peak intensity of the characteristic peak at the chemical shift of −61±1 ppm is recorded as N3, then X1 as defined by formula (1) is in the range of 0.10-0.30; X1=N1/N3 (1); and X2 as defined by formula (2) is in the range of 0.15-0.45; X2=N2/N3 (2). When the molecular sieve is used in the gas-phase Beckmann rearrangement reaction of cyclohexanone oxime, the selectivity of the caprolactam product and the catalyst life can be improved.
A hierarchical porous all-silica molecular sieve, characterized by solid nuclear magnetic resonance technology using trimethylphosphine (TMP) as a probe molecule, the 31P MAS NMR spectrum of the molecular sieve showing three characteristic peaks at chemical shifts of −5±1 ppm, −34±1 ppm and −61±1 ppm, wherein the peak intensity of the characteristic peak at the chemical shift of −5±1 ppm is recorded as N1, the peak intensity of the characteristic peak at the chemical shift of −34±1 ppm is recorded as N2, and the peak intensity of the characteristic peak at the chemical shift of −61±1 ppm is recorded as N3, then:
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