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yaoyao06

银虫 (正式写手)

[交流] 求助合成全硅的ZSM-5

有没有虫虫合成过全硅的ZSM-5啊?请赐教。谢谢!
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dj_king

铁杆木虫 (著名写手)

★ ★
buffaloli(金币+2,VIP+0):多谢!呵呵,辛苦了!
http://www.iza-online.org/synthesis/Recipes/Silicalite-1.html

MFI
Silicalite-1
Si(100)


Contributed by A. C. Faust and C. Schott-Darie

Verified by J. Cejka and by B. Schoeman

Type Material Si96O192F4(TPA)4 (TPA = tetra-n-propylammonium)

Method J.-L Guth, H. Kessler, R. Wey [1]

Batch Composition 1 SiO2 : 0.08 (TPA)Br: 0.04 NH4F: 20 H2O

Source Materials

distilled water
tetrapropylammonium bromide (Fluka, 98%)
ammonium fluoride (Fluka, 98%)
silica (Degussa Aerosil 130, 99+%)

Batch Preparation (for 12 g product)

(1) [72 g water + 4.26 g tetrapropylammonium bromide + 0.296 g ammonium fluoride], stir until dissolved
(2) [(1) + 12 g silica], mix with a spatula, and then stir until homogenized. Initial pH = 6

Crystallization

Vessel: PTFE-lined autoclave
Time: 15 days a
Temperature: 2000C
Agitation: none

Product Recovery

(1) Filter, wash with distilled water
(2) Dry at 800C
(3) Yield: 12.7 g; near 100% based on silica

Product Characterization

XRD: characteristic strong reflections at d = 11.01, 3.829, 3.806 and 3.698 Å
Elemental Analyses: Si96O192F4(TPA)4
Crystal Size and Habit: prisms 95 x 80 um
Click here to view XRD pattern

Reference

[1] J.-L Guth, H. Kessler, R Wey, in Stud. Surf. Sci. Catal., Vol. 28, Y. Murakami, A. Iijima, J. W. Ward (eds.), Kodansha-Elsevier, Tokyo, 1986, p. 121

Note

a. Increasing NH4F leads to a decrease in crystallization time (2 days for NH4F/SiO2 = 1).
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2楼2008-04-01 17:00:49
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