Kinetics and Mechanism of the Hydrolysis and Rearrangement Processes within the Assembly-Disassembly-Organization-Reassembly Synthesis of Zeolites

Journal of the American Chemical Society
Susan E HenkelisRussell E Morris

Abstract

The hydrolysis (disassembly, D) and rearrangement (organization, O) steps of the assembly-disassembly-organization-reassembly (ADOR) process for the synthesis of zeolites have been studied. Germanium-rich UTL was subjected to hydrolysis conditions in water to understand the effects of temperature (100, 92, 85, 81, 77, and 70 °C). Samples were taken periodically over an 8-37 h period, and each sample was analyzed by powder X-ray diffraction. The results show that the hydrolysis step is solely dependent on the presence of liquid water, whereas the rearrangement is dependent on the temperature of the system. The kinetics have been investigated using the Avrami-Erofeev model. With increasing temperature, an increase in the rate of reaction for the rearrangement step was observed, and the Arrhenius equation was used to ascertain an apparent activation energy for the rearrangement from the kinetic product of the disassembly (IPC-1P) to the thermodynamic product of the rearrangement (IPC-2P). From this information, a mechanism for this transformation can be postulated.

References

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Jun 22, 2013·Nature Chemistry·Wieslaw J RothJiří Cejka
Apr 9, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Mariya ShamzhyJiří Čejka
Oct 7, 2014·Angewandte Chemie·Paul S WheatleyRussell E Morris
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Jul 6, 2017·Physical Chemistry Chemical Physics : PCCP·Fabienne Barroso-Bujans, Angel Alegria

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Citations

Aug 12, 2020·Advanced Materials·Christopher James HeardPetr Nachtigall
Oct 10, 2020·Chemical Science·Daniel N RainerRussell E Morris
Jul 6, 2021·Materials Advances·Ondřej VeselýJiří Čejka
Oct 14, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Chaoqun BianJianping Qiu

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Methods Mentioned

BETA
NMR
X-ray

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