Cu/Ti-HMS分子筛的制备及脱硫性能研究

Preparation and desulfurization performance of Cu/Ti-HMS

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(HMS)以及一系列不同n(Si)/n(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、H2O2/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HMS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0.1g/10mL模型油,n(H2O2)/n(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）/n（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.