物理化学学报 >> 1998, Vol. 14 >> Issue (05): 448-452.doi: 10.3866/PKU.WHXB19980513

研究论文 上一篇    下一篇

微波辐射促进ZnCl2与Y分子筛固相反应的研究

银董红, 尹笃林   

  1. 湖南师范大学精细催化合成研究所，长沙 410081
  • 收稿日期:1997-09-22 修回日期:1997-12-22 发布日期:1998-05-15
  • 通讯作者: 银董红

Study on the Solid-state Reaction of ZnCl2 and Y Zeolites under Microwave lrradiation

Yin Dong-Hong, Yin Du-Lin   

  1. Institute of Fine Catalysis and Synthesis,Hunan Normal University,Changsha 410081
  • Received:1997-09-22 Revised:1997-12-22 Published:1998-05-15
  • Contact: Yin Dong-Hong

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摘要：

采用XRD、IR和原子吸收光谱等手段对微波固相法制备的ZnCl2／Y催化剂进行了表征. 微波辐射促进了ZnCl2在分子筛表面分散和固态离子交换，分散的ZnCl2可与分子筛表面氧原子发生较强的配位键合作用．当ZnCl2的负载量达到37.5％时，ZnCl2仍可完全分散于NaY分子筛表面，此时的固态离子交换度为84％．随着分子筛表面酸菌和区强度的增加，ZnCl2与分子筛的固态离子交换量减少．

关键词: 微波辐射, ZnCl2, Y分子筛, 固相反应, 催化剂

Abstract:

ZnCl2/Y catalysts prepared by solid-state reaction of anhydrous ZnCl2 and Y zeolites under microwave irradiation were characterized by XRD, IR and AAS. ZnCl2 was intercalated in Y zeolites and dispersed on the surface of Y zeolite, part of ZnCl2 dispersed could result in solid-state ion exchange with Y. The amount of dispersion and solid-state ion exchange were related to ZnCl2 loading and the surface acid property of the zeolite. When ZnCl2 loading was 37.5% (mass fraction) in NaY zeolite, ZnCl2 was still completely dispersed on the surf are of zeolite and the degree of solid- state ion exchang was 84%. The appearance of new band at 890 cm-l in the framework IR spectra of ZnCl2/NaY sample was due to the dispersed ZnCl2 coordinating strongly with oxygen of NaY surface. With the increasing of the number of arid centers and the acid strength of the surface of Y zeolite the amount of solid-state ion exchange decreased.

Key words: Microwave irradiation, ZnCl2, Y zeolite, Solide-state reaction, Catalyst