STRUCTURES OF ALUMINUM-OXIDE POLYHEDRON IN FLY ASH BEFORE AND AFTER GRINDING STUDIED BY SOLID STATE NMR

Abstract

Abstract:

The structures of aluminum-oxide polyhedron in fly ash and their changes after a grinding process were studied by ²⁷Al MAS and 2D 3QMAS NMR. The results showed that tetrahedron and octahedron are the main forms of aluminum-oxide polyhedron in raw fly ash, and they exist in a multi-structural surrounding. Only slight changes were observed for the tetrahedron structures after grinding, indicating that they are stable, probably because they exist in a three dimensional structural net of [SiO₄]^4-. The results also showed that, after grind ing, part of the octahedron structures broken away from the net, and transformed and distributed in a symmetrical structural surrounding. The results from the 2D 3QMAS experiments showed that a small amount of hexahedron structures originally existed in the raw fly ash was damaged after grinding.

Key words: NMR, fly ash, ground, aluminum-oxide polyhedron

CLC Number:

O643

WANG Xiao-Jun. STRUCTURES OF ALUMINUM-OXIDE POLYHEDRON IN FLY ASH BEFORE AND AFTER GRINDING STUDIED BY SOLID STATE NMR[J]. Chinese Journal of Magnetic Resonance, 2004, 21(2): 199-203.

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STRUCTURES OF ALUMINUM-OXIDE POLYHEDRON IN FLY ASH BEFORE AND AFTER GRINDING STUDIED BY SOLID STATE NMR

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