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What is HZSM-5? I have seen it used as a catalyst support in literature. It seems to be related to the ZSM-5 zeolite, but I am not sure how.

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    $\begingroup$ see chemicalforums.com/index.php?topic=34583.0 $\ce{H^+}$ instead of $\ce{Na^+}$ at ion exchange site. $\endgroup$ – MaxW Jul 19 '17 at 21:20
  • $\begingroup$ It can also be used as an acid catalyst in its own right $\endgroup$ – Beerhunter Jul 26 '17 at 20:56
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According to this article(1), the difference between the zeolites HZSM-5 and ZSM-5 is that the first has a monoclinic and the second has an orthorhombic framework.

(1) H. van Koningsveld, J.C. Jansen, H. van Bekkum, The monoclinic framework structure of zeolite H-ZSM-5. Comparison with the orthorhombic framework of as-synthesized ZSM-5, Zeolites, Volume 10, Issue 4, 1990, Pages 235-242

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