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Topic: ZSM-5 and HZSM-5 zeolitic materials  (Read 21871 times)

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Offline ping_resolute

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ZSM-5 and HZSM-5 zeolitic materials
« on: July 18, 2009, 02:34:34 AM »
   I want to know how different between ZSM-5 and HZSM-5. Actually, I want to studied about mechanism of MTO which ZSM-5 was normally employed. But now I'm confusing about ZSM-5 and HZSM-5.

Please clarify this for me. Thank you in advance
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Offline TrentG

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Re: ZSM-5 and HZSM-5 zeolitic materials
« Reply #1 on: August 09, 2009, 02:23:28 PM »
For HZSM-5, the zeolite ion exchange sites are occupied by H+ ions.  This is normally done by ion exchanging the zeolite with NH4Cl to produce a NH4+ exchanged zeolite.  That zeolite is then heated to decompose the NH4+ to H+ and ammonia.

ZSM-5 is more general in that any ions can occupy the ion exchange sites.  For example, both HZSM-5 and NaZSM-5 are ZSM-5, but it doesn’t work the other way around.

Another term that you will see in the literature for ZSM-5 is MFI.

Offline Huda

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Re: ZSM-5 and HZSM-5 zeolitic materials
« Reply #2 on: September 04, 2009, 01:11:25 PM »
ZSM-5 is general term for NaZSM-5.

And when we use ZSM-5 in any application, we exchange Na+ to another cations.

and write HZSM-5, NiZSM-5, CuZSM-5, .. etc.


 
« Last Edit: September 04, 2009, 01:22:48 PM by shion »

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