介孔分子筛表面丁基锡的制备和性能

Preparation and Properties of Surface Butyltin of Mesoporous Molecular Sieves

在高真空系统中研究了MCM-41介孔分子筛与四丁基锡的反应,并用元素分析、气体容量分析、XRD、FTIR、13C及119SnMASNMR和氮气及烃吸附等方法表征了产物的组成、结构和性质。结果表明,MCM-41的表面羟基与四丁基锡能在150℃发生反应,在200℃预脱水处理后的MCM-41上生成组成为(≡Si-O)xSn(n-Bu)4-x的表面混合物,而在500℃预脱水处理后的MCM-41上则得到组成为≡Si-O-Sn(n-Bu)3的表面单接枝物种;表面接枝丁基锡物种导致MCM-41的孔道尺寸变小,表面组成改变,从而引起对烷烃的吸附行为发生变化。

Reaction of MCM-41 mesoporous molecular sieves with tetrabutyl tin was studied in a high vacuum. The composition, structure and properties of the resulted materials were characterized by using element analysis, gas volumetry analysis, XRD, FTIR, C-13 and Sn-119 MAS NMR, adsorption of nitrogen and hydrocarbons etc., respectively. The results showed that the reaction leads to formation of multigrafted species (drop Si-O)(x)Sn (n-Bu)(4-x) for MCM-41 dehydrated at 200degreesC, and to formation of monografted species dropSi-OSn(n-Bu)(3) for MCM-41 dehydrated at 500degreesC. Grafting butyltin species onto the surface resulted in reduction of MCM-41 pore size and modification of adsorptive performance of MCM-41 to hydrocarbons.