物理化学学报 >> 2004, Vol. 20 >> Issue (03): 265-270.doi: 10.3866/PKU.WHXB20040310

研究论文 上一篇    下一篇

纳米硅铝介孔分子筛的合成及其催化裂化性能

师希娥;翟尚儒;戴立益;单永奎;何鸣元;魏伟;吴东;孙予罕   

  1. 华东师范大学化学系,上海　200062;中国科学院山西煤炭化学研究所,煤转化国家重点实验室,太原　030001
  • 收稿日期:2003-08-01 修回日期:2003-11-10 发布日期:2004-03-15
  • 通讯作者: 吴东 E-mail:wudong@sxicc.ac.cn

Synthesis of Mesoporous Aluminosilicate Nanoparticles and Its Performance in Catalytic Cracking

Shi Xi-E;Zhai Shang-Ru;Dai Li-Yi;Shan Yong-Kui;He Ming-Yuan;Wei Wei;Wu Dong;Sun Yu-Han   

  1. Department of Chemistry, East China Normal University, Shanghai　200062;State Key Laboratory of Coal Conversion, Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan　030001
  • Received:2003-08-01 Revised:2003-11-10 Published:2004-03-15
  • Contact: Wu Dong E-mail:wudong@sxicc.ac.cn

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摘要： 采用低温晶化法一步合成了纳米硅铝介孔分子筛( 记为Z-1),并通过XRD、BET、N2吸/脱附曲线和TEM等手段对其结构性质进行了表征.结果表明:所合成的分子筛具有类似MCM-41的六方结构,较好的介孔特征,孔分布狭窄,纳米级晶粒( 40～50 nm ).用氨气程序升温脱附（NH3-TPD）法测试了其酸强度;并采用脉冲法,以异丙苯和1,3,5-三异丙苯的催化裂化为探针反应,考察了该分子筛的催化裂化性能和水热稳定性.Z-1与后嫁接法制得的AlMCM-41相比,呈现出较高的催化活性、选择性和蒸气稳定性.

关键词: 介孔分子筛, 酸性, AlMCM-41, 催化裂化, 异丙苯, 1,3,5-三异丙苯

Abstract: Mesoporous aluminosilicate (denoted as Z-1) nanoparticles were synthesized from assembly of mixture of tetraethylorthosilicate (TEOS) and aluminum nitrate nonahydrate (ANN) with cetyltrimethylammonium bromide (CTAB) as template at low temperture. Important information about textural properties of the material were obtained by powder X-ray diffraction (XRD), N2 adsorption-desorption isotherms at 77 K and transmission electron microscopy (TEM),and the acid properties were determined by temperature-programmed desorption of ammonia (NH3-TPD).The results obtained by these methods indicated that the material possessed hexagonal mesostructure, narrow pore-size distribution and nanoparticles. The NH3-TPD showed that the acdity strength of Z-1 was similar to AlMCM-41, but the amount of medium-acid of Z-1 was more than that of AlMCM-41 prepared by post-synthesis method. In catalytic cracking of cumene and 1,3,5-triisopropylbenzene,Z-1 exhibited higher cataclytic acitivity, selectivity and steam stability (100％ water vapor,800 ℃,2 h) compared with AlMCM-41.

Key words: Mesoporous molecular sieves, Acidity, AlMCM-41, Catalytic cracking, 　Cumene, 1,3,5-triisopropylbenzene