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<p>boron, zinc, tin, and titanium have been investigated. Other heteroatoms have been claimed, including <a href="page.php?w=titanium">titanium</a>, and <a href="page.php?w=zinc">zinc</a> Al atoms in zeolites can be also structurally replaced with <a href="page.php?w=boron">boron</a> and <a href="page.php?w=gallium">gallium</a>.</p>

<p>The <a href="page.php?w=silicoaluminophosphate">silicoaluminophosphate</a> type (AlPO molecular sieve), in which Si is isomorphous with Al and P and Al is isomorphous with Si, and the gallogermanate and others are</p><p>
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