Thermal shrinkage of various cation forms of zeolite A

The thermal shrinkage of Li, Na, K, Cs, ammonium, H, and Ca forms of zeolite A has been investigated by dilatometry up to 650°C. The shrinkages of Li, Na, K, Cs and Ca forms are attributed to the dehydration and partial structural collapse which predominates over the normal thermal expansion and cat...

Full description

Saved in:
Bibliographic Details
Published in:Thermochimica acta 1997-08, Vol.296 (1), p.59-66
Main Authors: Colantuono, A., Dal Vecchio, S., Mascolo, G., Pansini, M.
Format: Article
Language:English
Subjects:
Dilatometry
Shrinkage
Thermal
Zeolite A
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The thermal shrinkage of Li, Na, K, Cs, ammonium, H, and Ca forms of zeolite A has been investigated by dilatometry up to 650°C. The shrinkages of Li, Na, K, Cs and Ca forms are attributed to the dehydration and partial structural collapse which predominates over the normal thermal expansion and cation migration from one site to another in the zeolitic structure. The ammonium form shows a noticeable shrinkage and a possible catalytic action of the acid sites produced in the zeolite A in the combustion of ammonia evolved upon heating. The H form undergoes collapse at temperatures higher than 350–400°C depending on the heating rate.
ISSN:0040-6031
1872-762X
DOI:10.1016/S0040-6031(97)00065-8