催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (9): 761-765.

• 研究论文 • 上一篇    下一篇

无导向剂直接水热合成小粒径的NaY分子筛

胡林彦1,2,谢素娟1,王清遐1,刘盛林1,徐龙伢1   

  1. 1 中国科学院大连化学物理研究所, 辽宁大连 116023; 2 中国科学院研究生院, 北京 100049
  • 收稿日期:2007-09-25 出版日期:2007-09-25 发布日期:2011-09-28

Direct Synthesis of NaY Zeolite with Small Crystal Size via Hydrothermal Method without Seed Gel

HU Linyan1,2, XIE Sujuan1, WANG Qingxia1, LIU Shenglin1, XU Longya1*   

  1. 1 Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2007-09-25 Online:2007-09-25 Published:2011-09-28

PDF

1050

被引次数

68

摘要： 以铝酸钠和硅溶胶作为主要原料,在没有引入晶种或有机添加剂的情况下,通过控制合成体系的水含量以及水热合成条件(凝胶摩尔组成: 5.1 Na2O•Al2O3•10 SiO2•(140～220) H2O, 室温陈化1～3 d及100 ℃晶化9 h), 可获得粒径为0.30～0.35 μm的小晶粒NaY分子筛. 借助于XRD, SEM, XRF和DLS等分析手段对分子筛进行了表征,表明所合成的小晶粒NaY分子筛具有粒度均匀、分散性好的特点. 对比了两种不同粒径的La/Y催化剂对1-丁烯脉冲芳构化反应的催化性能和反应过程中催化剂的积炭行为,表明粒径较小的催化剂具有较好的稳定性,其容炭能力和抗积炭能力较强.

关键词: 直接合成, 水热法, NaY分子筛, 小晶粒, 丁烯, 芳构化

Abstract: The NaY zeolite with small crystal size between 0.30 and 0.35 μm could be directly synthesized by the hydrothermal method, using sodium aluminate and silica sol as the main raw materials without seed gel or organic additives under hydrothermal conditions. The molar composition of reactants was 5.1 Na2O•Al2O3•10 SiO2•(140-220) H2O, and the reaction system was aged at room temperature for 3 d and was then crystallized at 100 ℃ for 9 h). The NaY zeolite samples were characterized by XRD, SEM, XRF, and DLS techniques. The samples have uniform granularity and good dispersibility. The catalytic performance of two La/Y catalyst samples with different crystal sizes for 1-butene pulse aromatization was measured. The La/Y catalyst sample with smaller crystal size has better aromatization stability, coke accommodation capability, and resistance ability to coke deposition.

Key words: direct synthesis, hydrothermal method, NaY zeolite, small crystal size, butene, aromatization