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Control of Crystal Size of MOR

This study explores methods to control crystal size in MOR zeolite synthesis by adjusting seed crystal type, amount, Si/Al ratio, NH4NO3 effect, pressure, aging time, and material addition order. SEM images demonstrate the impact of quenching at different intervals on crystal growth.

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Control of Crystal Size of MOR

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  1. Control of Crystal Size of MOR Huimin Zhan 2013.10.11

  2. MOR 20 30 40 50 10 2 θ (degree) The Synthesis of MOR （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

  3. 48h急冷 24h急冷 12h急冷 9h急冷 6h急冷 3h急冷 未急冷 20 30 40 50 10 2θ degree Quenching inthe course of crystallization process

  4. （6h急冷） (3h急冷) （9h急冷） （24h急冷） （48h急冷）

  5. Fig. 1. SEM images of MORs obtained by quenching in the course of crystallization. (a) 0, (b) 6h, (c) 24h, (d) 36h B. Lu et al. / Microporous and Mesoporous Materials 95 (2006) 141–145

  6. Work Plan 1、To synthesize MOR with uniform crystal size ＊To change the type of seed crystal Fig. 1. SEM images of high-silica MOR zeolites synthesized with seed crystals B. Fig. 2. SEM images of seed crystal B after alkaline treatment. The low dissolubility of seed crystals synthesized with NaF may be caused by the fewer structural defects . B. Lu et al. / Microporous and Mesoporous Materials 76 (2004) 1–7

  7. 1、To synthesize MOR with uniform crystal size ＊To change the amount of seed crystal The amount of seed crystals depends upon the Si/Alratio of starting gel. ＊The effect of NH4NO3 ＊The effect of pressure ＊The effect of aging time ＊The order of addition of material 2、To control Si/Al of MOR The zeolite formed is much richer in aluminum than the synthesis gel .

  8. Thanks for Your Attention! Qs & As

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