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Preparation and characterization of dealuminated metakaolin and its use in the transformation of waste plastics to aromatic hydrocarbons.

Authors :
Breen C
Taylor S
Burguin E
Centeno M
Source :
Journal of colloid and interface science [J Colloid Interface Sci] 2002 Mar 01; Vol. 247 (1), pp. 246-50.
Publication Year :
2002

Abstract

Acid activated metakaolins (AAMKs) have been prepared by calcination of the natural clay at 600 degrees C to provide a metakolin which was then leached at 80 degrees C for 3 h using 1M, 2M, 3M, and 6M HCl. These materials were characterized and their ability to transform the off gases from HDPE decomposition into useful aromatic species was evaluated. The amount of adsorbed water and the number of acid sites increased with the severity of acid treatment. Variable temperature DRIFTS spectroscopy of pyridine treated samples revealed that both Brønsted and Lewis acid centers were present until 425 degrees C. Pyridine bonded to the Lewis acid centers was more thermally stable. The AAMKs were all selective to the production of toluene with respectable, but lesser, amounts of xylenes and trimethylbenzenes. This selectivity contrasts with that of acid leached and pillared smectites which are selective toward trimethylbenzene.

Details

Language :
English
ISSN :
0021-9797
Volume :
247
Issue :
1
Database :
MEDLINE
Journal :
Journal of colloid and interface science
Publication Type :
Academic Journal
Accession number :
16290461
Full Text :
https://doi.org/10.1006/jcis.2001.8092