TS－1沸石晶化过程中的影响因素  

Factors Influencing TS-1 Zeolite Crystallization

作　　者：夏清华[1] 王公慰[1] 应慕良[1] 郑禄彬[1] 

机构地区：[1]中国科学院大连化学物理研究所

出　　处：《石油化工》1995年第5期316-320,共5页Petrochemical Technology

摘　　要：用水热晶化法在ＳｉＯ＿２·ＴｉＯ＿２·ＴＰＡＯＨ－Ｈ＿２Ｏ反应体系中对影响ＴＳ－１沸石晶化过程的因素进行了考察。结果表明，ＳｉＯ＿２／ＴｉＯ＿２比、ＴＰＡＯＨ／ＳｉＯ＿２比，Ｈ＿２Ｏ／ＳｉＯ＿２比、晶化温度及晶化时间对、ＴＳ－１沸石分子筛的形成和结晶度均有很大影响。ＴＳ－１沸石的晶化速度较快，在１２－２４小时之间即可完成。延长时间，结晶度普遍有降低的趋势。晶化温度以４３３Ｋ－４４８Ｋ为佳，最佳配方为ＳｉＯ＿２·ｘＴｉＯ＿２·０．２５－０．４０ＴＰＡＯＨ．２５－４０Ｈ＿２Ｏ（ｘ＝０．００－０．１０）。从ＩＲ光谱数据Ｉ＿９６０／Ｉ＿５５０随时间变化来着，骨架钛含量最大值出现在３６－９６小时之间，所以实际晶化过程以２－４天为宜。从所绘的三元相区图来看，配方只能在小区间变化，这主要由于钛含量的限制。ＴＳ－１沸石热稳定性大于１４７３Ｋ。Factors influencing TS-1 zeolite crystallization in SiO_2-TiO_2-TPAOH-H_2O system havebeen studied with hydrothermal method. The formation and crystallinity of the product wasstrongly dependent on SiO_2/TiO_2,H_2O/SiO_2,and TPAOH/SiO_2 ratios in the reaction mixture.The crystallization kinetic curves indicated that the crystallization rate of TS-1 zeolite wasquick and the crystallinity of the product gradually reduced when the crystallization timewas prolonged.I_(960)/I (550) data of IR spectra revealed that the maximum titanium content ofTS-1 zeolite lattice as-synthesized appeared between 36h and 96h during the synthesis.Ascan be seen from the three-element phase diagram of formation of TS-1 zeolite,the crystalli-zation formulation can only be changed within a narrow range. TG-DTA test confirmed thatthe thermal stability of TS-1 zeolite framework was over 1473K. The optimum conditions forTS-1 zeolite synthesis were:temperature,433K to 448K;time,2d to 4d,and formulation,SiO_2·xTiO_2·0.25-0.40 TPAOH·25-40H_20(where x=0.00-0,10)。

关 键 词：水热合成 沸石 晶化 动力学 吸附剂 

分 类 号：O647.33[理学—物理化学] TQ424.25[理学—化学]