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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.51A [2012] >
IJC-A Vol.51A(12) [December 2012] >
| Title: | Accelerated polymorphous transformations of alumina induced by copper ions impede spinel formation |
| Authors: | Kiss, E
Ratković, S
Vujičić, Dj
Boskovic, G |
| Keywords: | Alumina
Polymorphous transformations
Spinels
Sintering
Copper
Magnesium
Zinc |
| Issue Date: | Dec-2012 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Slower copper spinel formation on alumina
type supports relative to zinc and magnesium spinel formation has been
investigated. Spinel formation occurs at high temperatures and is usually
accompanied by polymorphous transformations of alumina support and sintering.
In samples containing zinc and magnesium ions, decelerated polymorphous
transformations of alumina occur relative to the transformation of pure aluminum
sample. The impeded phase transformation of alumina coincides
with decreased degree of sintering. In contrast, copper ions accelerate
polymorphous transformations of alumina, and consequently the corresponding
copper-alumina spinel
formation is slower. Accelerated sintering may be explained by accelerated
phase transformation of alumina, which itself is caused by copper ions slowing
down spinel formation. |
| Page(s): | 1669-1676 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-0975(Online); 0376-4710(Print) |
| Source: | IJC-A Vol.51A(12) [December 2012]
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