کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4758134 | 1420404 | 2018 | 10 صفحه PDF | دانلود رایگان |
- Successful synthesis of EMT-type zeolite using a lower amount of 18-crown-6 ether than previously reported.
- Extended hydrothermal synthesis duration can be used to compensate for the decreased crystallinity at low amounts of 18-crown-6 ether.
- Lowering the amount of 18-crown-6 ether in the hydrogel promotes growth along c axis of the hexagonal platelet crystals.
Presently it is understood that 18-crown-6 ether is necessary as an organic template to synthesise pure and well crystalline EMT-type zeolites. This is problematic for optimisation of organic-free synthesis of zeolites. We report a new method to synthesise pure zeolite EMC-2 using a lower amount of 18-crown-6 ether than previously reported. At these low 18-crown-6 ether concentrations, FAU-type zeolites were not seen to co-crystallise. We observe that the crystallinity of the EMT-type zeolite is proportional to the amount of 18-crown-6 ether added in the synthesis. The as-synthesised zeolites were characterised using X-ray powder diffraction, scanning electron microscopy and solid state nuclear magnetic resonance. These findings are a crucial step towards understanding template roles and designing syntheses for zeolites without the use of toxic organic templates.
205
Journal: Microporous and Mesoporous Materials - Volume 255, 1 January 2018, Pages 261-270