以十二胺为模板剂,正硅酸乙酯为硅源,室温下合成了六方介孔硅(H MS )以及一系列不同n(Si)(Ti)的介孔分子筛Ti-HMS。并分别以 HMS和Ti-HMS 为载体,采用浸渍法合成了 Cu-HMS 和Cu/Ti-HMS分子筛。采用XRD、FT-IR、SEM等手段对其进行了表征。分别考察了硅钛比、反应时间、催化剂用量、反应温度、H2 O2/S 的摩尔比对 Cu/Ti-HMS脱除模型油中噻吩的影响。结果表明,合成的 H MS与Ti-HMS均有明显的六方介孔特征,引入 Cu 后六方介孔结构仍保持完好。Cu/Ti-HMS 能有效地催化氧化脱除噻吩。在常压70℃时,当催化剂用量为0.1 g/10 mL模型油,n(H2 O2)(S)为6,乙腈为萃取剂时,脱硫率达93.54%。%Hexagonal mesoporous silica (HMS)and titanium-containing hexagonal mesoporous silica (Ti-HMS) with different Ti contents were synthesized by using neutral dodecylamine as template and tetraethyl orthosili-cate as Si source in neutral solution and at ambient temperature.HMS and Ti-HMS as supports of Cu-HMS and Cu/Ti-HMS,the samples were obtained by impregnation method,respectively.The obtained samples were characterized by X-ray powder diffraction (XRD),pyridine adsorption in Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM).The effects of the mole ratio of n(Si)(Ti),the reac-tion time,the amount of the Cu/Ti-HMS catalyst,the reaction temperature,and the mole ratio of H2 O2/S on the removal rate were studied.The results showed that HMS and Ti-HMS have the typical hexagonal meso-porous structure and the structure was kepted well after the copper was incoporated.Cu/Ti-HMS showed high activity in removing thiophene in model oil.The desulfurization rate reached up to 93.54% with a H2 O2/S mole ratio of 4∶1 at atmospheric pressure and 333 K,using acetonitrile as the extractant.
展开▼
