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Chemical Control of Thermal Expansion in Cation-Exchanged Zeolite A

DOI: 10.1021/cm403312q DOI Help

Authors: Tom Carey (University of Birmingham) , Chiu Tang (Diamond Light Source) , Joe Hriljac (University of Birmingham) , Paul Anderson (University of Birmingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemistry Of Materials , VOL 26 (4) , PAGES 1561 - 1566

State: Published (Approved)
Published: February 2014

Abstract: Variable-temperature powder X-ray diffraction studies have been used to monitor dramatic changes in the thermal expansion properties of zeolites with the LTA topology on changing the pore contents. Detailed structural analysis was performed on dehydrated Li-, Na-, K-, Rb-, and Cs-exchanged zeolite A and a comparison made with their purely siliceous analogue ITQ-29. Mean thermal expansion coefficients were also determined for the hydrated alkali-metal-exchanged forms. Thermal expansion behavior ranging from negative to positive was observed as different monovalent cations were included in the zeolite pores. Cation-induced strain to the zeolite framework has been shown to play a significant role in the thermal expansion mechanism of LTA-zeolites. Atomic-scale mechanisms behind the thermal expansion behavior have been deduced for ITQ-29, dehydrated Ag-A, and dehydrated Na-A systems.

Subject Areas: Chemistry, Materials


Instruments: I11-High Resolution Powder Diffraction