Toriya Sunao, Takei Takashi, Fuji Masayoshi, Chikazawa Masatoshi
Department of Applied Chemistry, Graduate School of Engineering, Tokyo Metropolitan University, 1-1 Minami-ohsawa, Hachioji, Tokyo 192-0397, Japan.
J Colloid Interface Sci. 2003 Dec 15;268(2):435-40. doi: 10.1016/j.jcis.2003.08.025.
A series of aluminum-containing kanemite (Al-kanemite) samples with several Si/Al molar ratios were synthesized. The Al-kanemite samples were pillared with silica. X-ray diffractograms showed that the layered structure of the Al-kanemite samples was maintained at Si/Al= infinity approximately 10 but was broken at Si/Al = 5, 2.5, and 1. 29Si MAS NMR spectra of the Al-kanemite samples, except for that of Si/Al = 1, mainly showed peaks of Q(3) sites, which were attributed to Si(OSi)(3)(OH) groups, although peaks assigned to Si(OAl)(OSi)(2)(OH) were also seen. The 27Al MAS NMR spectra indicated that the Al-kanemite samples had only four-coordinate aluminum atoms. The FTIR spectra of pyridine adsorbed on the pillared Al-kanemite derivatives revealed Lewis acid sites on the surface. The nitrogen adsorption isotherms of the derivatives were classified as type I (Langmuir) absorption isotherms. Using the alpha(s) method, the specific surface areas of the derivatives were 572-756 m(2)g(-1), and the pore sizes were calculated as 1.25-1.83 nm. The pillared Al-kanemite derivatives had slit-shaped micropore structures.
合成了一系列具有不同硅铝摩尔比的含铝丝光沸石（铝丝光沸石）样品。用二氧化硅对铝丝光沸石样品进行柱撑。X射线衍射图表明，铝丝光沸石样品的层状结构在硅铝比约为无穷大至10时得以保持，但在硅铝比为5、2.5和1时被破坏。铝丝光沸石样品（硅铝比为1的样品除外）的29Si MAS NMR谱主要显示Q(3)位点的峰，这些峰归属于Si(OSi)(3)(OH)基团，不过也观察到了归属于Si(OAl)(OSi)(2)(OH)的峰。27Al MAS NMR谱表明铝丝光沸石样品仅含有四配位铝原子。吸附在柱撑铝丝光沸石衍生物上的吡啶的FTIR光谱显示其表面存在路易斯酸位点。衍生物的氮吸附等温线属于I型（朗缪尔）吸附等温线。采用α(s)法，衍生物的比表面积为572 - 756 m(2)g(-1)，孔径计算为1.25 - 1.83 nm。柱撑铝丝光沸石衍生物具有狭缝形微孔结构。
