高等学校化学学报

高等学校化学学报 ›› 1988, Vol. 9 ›› Issue (10): 987.

• 论文 • 上一篇    下一篇

弱酸性介质中合成B-ZSM-5型分子筛

裘式纶, 庞文琴, 赵大庆   

  1. 吉林大学合成与催化研究所
  • 收稿日期:1987-05-05 出版日期:1988-10-24 发布日期:1988-10-24
  • 通讯作者: 裘式纶

Synthesis of B-ZSM-5 Zeolites in Slightly Acidic Medium

Qiu Shilun, Pang Wenqin, Zhao Daqing   

  1. Institute of Synthetic and Catalytic Chemistry, Jilin University, Changchun
  • Received:1987-05-05 Online:1988-10-24 Published:1988-10-24

PDF (PC)

被引次数

23

摘要： 在弱酸性介质中,用四丙基溴化铵、氟化铵合成了B-ZSM-5型分子筛。由于晶化过程中无碱金属氢氧化物等强碱参与,B-ZSM-5型分子筛原粉为铵型,灼烧除掉NH3及有机模板剂后,直接转化为氢型,吸附吡啶后IR谱中有B酸和L酸中心存在。扫描电镜分析表明,B-ZSM-5分子筛晶体生长完美,晶体形貌随硼含量不同呈规律性变化。X射线衍射、红外光谱、X射线光电子能谱、差热分析等结果表明,硼原子位于ZSM-5分子筛骨架中。

关键词: 分子筛, ZSM-5, 硼

Abstract: B-ZSM-5 type molecular sieve was synthesized by hydrothermal crystallization at 150-200℃ from mixture containing NH4F and tetrapropyl-ammonium bromide (TPABr) as template. pHvalues were 5~7. Because of the lack of alkaline metal hydroxide, NH4-form precursors were obtained and H-form B-ZSM-5 was directly yielded after calcination. After adsorption of pyridin the IRspectra showed the presence of both Lewis and Bronsted acid sites. SEManalysis indicated that the formation of large B-ZSM-5 crystals and its growth were pe'r-fect. Si substitution by Bled to a decrease of crystal size and of the length/width ratio. XRD, IR, XPS, DTAstudies on B-ZSM-5 proved that boron atom did situate in ZSM-5 framework.

Key words: Zeolite, ZSM-5, Boron

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