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| - Synthesis and Structure of Polymorph B of Zeolite Beta
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| Abstract
| - It was found that either polymorph B or polymorph C of zeolite beta can be obtained from the same structure directing agent: 4,4-dimethyl-4-azonia-tricyclo[5.2.2.02,6]undec-8-ene hydroxide. The synthesis occurs through a consecutive process where polymorph B is first formed and then transformed into polymorph C. It is possible to produce a zeolite highly enriched in polymorph B, provided that the transformation of this phase into polymorph C is slowed down up to the point where polymorph C is only detected at trace levels. The structure of polymorph B was determined for the first time by electron crystallography with SAED and HRTEM from areas of unfaulted polymorph B crystals.
- A highly enriched polymorph B of zeolite beta was synthesized by optimizing synthesis conditions. SAED patterns from different areas and directions showed that crystallites often contain twins of polymorph B and in some cases stacking faults. The twinning and stacking faults were observed more frequently near the surface than in the bulk of the crystallites. The structure of polymorph B was successfully determined by SAED and HRTEM from areas of unfaulted polymorph B crystals.
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| - Synthesis/Structure of Zeolite Beta Polymorph B
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