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Effect of sodium oxide on the morphology and basicity of alumina

✍ Scribed by V.A. Ivanov; A. Piéplu; J.C. Lavalley; P. Nortier

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
563 KB
Volume
131
Category
Article
ISSN
0926-860X

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✦ Synopsis

Various samples of alumina were compared to study the effect of crystaUinity and sodium impurity on alumina morphology and basicity. Carbon dioxide adsorption, followed by FT-IR and desorption (TPD), and COS hydrolysis test reaction were used. The decrease of surface area observed on rather amorphous samples after introduction of small amounts of sodium is ascribed to a better crystallinity due to migration of a part of Na + into the bulk. The charge compensation phenomenon decreases the number of defects in the anion subnetwork. It also provokes a decrease of the number of OH groups which could explain the decrease of activity towards COS hydrolysis of the samples containing very small amounts of Na20 ( < 1000 ppm). For larger amounts, COS conversion and carbon dioxide experiments showed an increase in basicity.

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