What question did this study set out to answer?

Investigate the structural changes and reaction mechanisms that occur during the alkali-induced synthesis of zeolite Na-A from metakaolinite.

January 1, 1991Journal of the Chemical Society Faraday Transactions

Synthesis of zeolite Na-A from metakaolinite revisited

View Full Paper

Ask AI

Bookmark

Investigate the structural changes and reaction mechanisms that occur during the alkali-induced synthesis of zeolite Na-A from metakaolinite.
Analyzed metakaolinite transformation using 29Si and 27Al NMR, XRD, IR spectroscopy, SEM, and EDAX.
Treated metakaolinite with 5 mol dm–3 NaOH and quantified aluminum coordination environments via fast magic-angle spinning (> 12 kHz) 27Al NMR across thermal activation states.
Five- and six-coordinated aluminum species rapidly shift to four-coordination upon exposure to NaOH, with metakaolinite displaying peak reactivity following heat treatment at approximately 700 °C.
Silicate and aluminate species dissolve under alkaline conditions and condense into an amorphous intermediate phase featuring a Si/Al ratio of 1.
The amorphous aluminosilicate intermediate directly converts into crystalline zeolite Na-A through a solid-state rearrangement.

Discussion

No takes yet. Share an insight, caveat, or question.

Implication

Spectroscopic analysis demonstrates the transformation pathways of metakaolinite into zeolite Na-A, indicating that precursor condensation precedes solid-state rearrangement.

Cite This Study

Klinowski et al. (1991) studied this question.

synapsesocial.com/papers/6a94ec618ce716a7e9fa5771 https://doi.org/10.1039/ft9918703091

View Full Paper

Ask AI

Bookmark

Implication

Spectroscopic analysis demonstrates the transformation pathways of metakaolinite into zeolite Na-A, indicating that precursor condensation precedes solid-state rearrangement.

Synthesis of zeolite Na-A from metakaolinite revisited

Key Points

Discussion

Implication

Cite This Study

Synthesis of zeolite Na-A from metakaolinite revisited

Key Points

Discussion

Implication

Cite This Study

Also Consider

Also Consider