control of crystal size of mor huimin zhan 2013.10.11
TRANSCRIPT
Control of Crystal Size of MOR
Huimin Zhan
2013.10.11
The Synthesis of MOR
10 20 30 40 50
MOR
2 θ (degree)
( a)
( b)
注:丝光沸石的 SEM图:( a)全景图( b) a图中小颗粒的放大图
Quenching in the course of crystallization process
10 20 30 40 50
2θ degree
未急冷
3h急冷
6h急冷
9h急冷
12h急冷
24h急冷
48h急冷
(3h急冷 ) ( 6h急冷)
( 9h急冷)
( 24h急冷)
( 48h急冷)
B. Lu et al. / Microporous and Mesoporous Materials 95 (2006) 141–145
Fig. 1. SEM images of MORs obtained by quenching in the course of crystallization. (a) 0, (b) 6h, (c) 24h, (d) 36h
Work Plan
1、 To synthesize MOR with uniform crystal size
* To change the type of seed crystal
B. Lu et al. / Microporous and Mesoporous Materials 76 (2004) 1–7
Fig. 2. SEM images of seed crystal B after alkaline treatment.
Fig. 1. SEM images of high-silica MOR zeolites synthesized with seed crystals B.
The low dissolubility of seed crystals synthesized with NaF may be caused by the fewer structural defects .
1、 To synthesize MOR with uniform crystal size
* To change the amount of seed crystal
The amount of seed crystals depends upon the Si/Al ratio of starting gel.
* The effect of NH4NO3
* The effect of pressure
* The effect of aging time
2、 To control Si/Al of MOR
* The order of addition of material
The zeolite formed is much richer in aluminum than the synthesis gel .
Thanks for Your Attention!
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