摘要
由ＴｉＣｌ４／ＨＣｌ配制的含钛柱化剂与粘土进行阳离子交换后得到大孔钛层柱粘土（Ｔｉ－ＰＩＬＣ），详细研究了各种合成条件，诸如Ｔｉ（Ⅳ）及ＨＣｌ浓度，柱化剂老化时间，粘土初始浓度，交换温度及配料比等对层柱粘土的大孔及比表面积的影响．优化条件合成的Ｔｉ－ＰＩＬＣ存在两种晶面间距（ｄ００１），其中之一（２．５６ｎｍ）对应大孔结构．Ｔｉ－ＰＩＬＣ比表面积为３２８ｍ２／ｇ，５００℃焙烧后ｄ００１保持２．３２ｎｍ，６５０℃焙烧后比表面积仍达３０１．４ｍ２／ｇ．Ｔｉ－ＰＩＬＣ的大孔结构主要取决于交换时混合液中Ｔｉ（Ⅳ）和ＨＣｌ浓度，并与柱化剂老化时间、交换温度等因素有关；与原柱化剂中Ｔｉ（Ⅳ）和ＨＣｌ浓度无关．混合液中ＣＨＣｌ提高，Ｔｉ－ＰＩＬＣ的比表面积下降；当ＣＨＣｌ增至７０ｍｍｏｌ／Ｌ时，产物中大晶面间距消失，仅留下小晶面间距（～１．４ｎｍ）．随着混合液中ＣＴｉＣｌ４的提高，Ｔｉ－ＰＩＬＣ的比表面积先上升而后下降。当ＣＴｉＣｌ４增至１４６ｍｍｏｌ／Ｌ时，产物也仅有小晶面间距（１．４ｎｍ）．
itanium pillared clay (Ti-PILC) with large pores is synthesized bycanon exchange of Na-montmorillonite with pillaging agent preparedfrom TiCl4/HCl4 The influence of various synthetic conditions (such asthe concentration of Ti(Ⅳ) and HCl, the aging time of pillaring solution, the initial concentration of clay, the exchange temperature and theTi/clay ratio) on macropore and surface area of Ti-PILC has been investigated in detail. The product prepared in optimal condition has twokinds of hasal spacing with 1.35 and 2.56 nm, and its surface area is328. 0 m2/g. The hasal spacing corresponding to large pore maintains2.32 urn after calcination at 500℃ and the surface area 301. 4 m2/g at650℃. The large hasal spacing (2.56 nm) of Ti-PILC is dependent onCTicl4 and CHCl in mixed suspension rather than those in pillaring solution, and it disappears when CHCl increases to 70 mmol/L or CTicl4 increases to 146 mmol/L. The surface area increases with increasing CTicl4or decreasing CHCl in the suspension. Further increase in CTicl4 results indecrease in surface area.
基金
国家自然科学基金
中国石化总公司科研基金
关键词
钛源
四氯化钛
钛层柱粘土
合成
hydrolysis, titanium tetrachloride, montmorillonite,Ti-pillared clay
