高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (6): 991.

• 研究论文 • 上一篇    下一篇

新型磷酸硅铝分子筛SAPO-56的合成与表征

田鹏, 许磊, 刘中民, 孙承林, 黄韬   

  1. 中国科学院大连化学物理研究所, 天然气化工与应用催化研究室, 大连 116023
  • 收稿日期:2000-04-25 出版日期:2001-06-24 发布日期:2001-06-24
  • 通讯作者: 刘中民(1964年出生),男,博士,研究员,博士生导师.从事分子筛合成、催化新材料的开发及应用、固体酸碱催化及其过程和C1化学与工程研究.E-mail:zml@ms.dicp.ac.cn E-mail:zml@ms.dicp.ac.cn

Synthesis and Characterization of SAPO-56, a New Member of Silicoaluminophosphate

TIAN Peng, XU Lei, LIU Zhong-Min, SUN Cheng-Lin, HUANG Tao   

  1. Natural Gas Utilization & Applied Catalysis laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
  • Received:2000-04-25 Online:2001-06-24 Published:2001-06-24

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被引次数

14

摘要： 以N,N,N',N'-四甲基-1,6-己二胺(TMHD)为模板剂,采用水热法在Al2O3-P2O5-SiO2体系中合成了SAPO-56分子筛.固定模板剂和水,得到Al-Si-P三元体系相图.当原料物质的量比为0.5<n(SiO2)/n(M)<0.7(M=SiO2+Al2O3+P2O5),0.15<n(Al2O3)/n(M)<0.4及0.1<n(P2O5)/n(M)<0.3时,出现SAPO-56合成的纯相区.固定合成凝胶中硅、铝、磷和水的量,模板剂的用量改变对合成影响较大.n(TMHD)/n(P2O5)≥2时,产物是纯SAPO-56.用XRD,SEM,IR,DTA-TG和吸附等方法研究了产物的物化性能.结果表明,SAPO-56分子筛具有较好的热稳定性(骨架坍塌温度为1150℃)和较大的水吸附量(41%).SAPO-56分子筛催化剂对甲醇转化制烯烃反应表现出了良好的催化活性和较高的C2和C3烯烃选择性.

关键词: SAPO-56, 分子筛, 合成, 甲醇转化

Abstract: The molecular sieve SAPO-56 has been synthesized hydrothermally using N,N,N',N' tetramethyl 1,6-dihexane as template. In the Al2O3-SiO2-P2O5 medium, phase diagram of SAPO-56 was obtained. Pure phase region of SAPO-56 appeared in the range of 0.5<n(SiO2)/n(M)<0.7(M=SiO 2+Al2O+3P2O5), 0.15<n(Al2O3)/n(M)<0.4 and 0.1<n(P2O5)/n(M)<0.3. The effect of template amount on the synthesis of SAPO-56 was also investigated. Provided that other compositions (Si, Al, Pand H2O) was fixed, it presented pure SAPO-56 crystal in the ratios of n(TMHD)/n(P2O5)≥2. The properties of SAPO-56 were characterized by XRD, SEM, TG-DTA, IRand adsorption technique which suggested that SAPO-56 had a good thermal stability and large water adsorption capacity. In the methanol to olefins reaction, SAPO-56 catalyst exhibited a high activity and selectivities to C2, C3 olefins.

Key words: SAPO-56, Molecular sieve, Synthesis, Methanol conversion

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