| KIT-1介孔分子筛的化学修饰及吸附性能 |
| Chemical Modification and Adsorption of the Pure Silica Mesoporous Molecular Sieve KIT-1 |
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| 摘要: |
| 关键词: 介孔分子筛 KIT-1 化学修饰 吸附容量 水热稳定性 |
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| Abstract: The pure silica mesoporous molecular sieve (KIT-1) was chemically modified using both organic and inorganic precursors and characterized using FTIR, XRD, MAS NMR, TG-DSC and physical adsorption-desorption of nitrogen. Experimental results showed that the original mesoporous structure of the samples remained after modification. The IR and MAS NMR spectra demonstrated that the organic groups (-Si(CH3)3 and -OCH2CH3) had successfully grafted onto the inter-surface of KIT-1 and inorganic atoms(Al, Si) attached at silicon atoms located in the hydrophobic part of the surface of KIT-1, but the grafted samples showed a lower BET surface area ,pore volume and smaller pore size. Modification using trimethylchlorosilane(TMCS) and TEOS was found to result in a significant loss in porosity. The surface property of samples was measured through adsorption capacity for the vapour of water or toluene. The modification samples show a higher adsorption capacity to toluene as compared to the parent KIT-1. The hydrophobicity of the sample modified by TMCS is much higher than other modified samples. Chemical modifications can greatly improve the hydrothermal stability of KIT-1 material because of the changed surface property. |
| Keywords: mesoporous molecular sieve KIT-1 chemical modification adsorption capacity. the hydrothermal stability |
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| 李惠云,华伟明,何其戈,郭金福,乐英红.KIT-1介孔分子筛的化学修饰及吸附性能[J].无机化学学报,2007,23(6):1093-1098. |
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