| dc.creator |
Nassar Eduardo J. |
|
| dc.creator |
Serra Osvaldo A. |
|
| dc.creator |
Souza-Aguiar Eduardo F. |
|
| dc.date |
1998 |
|
| dc.date.accessioned |
2013-05-30T10:45:40Z |
|
| dc.date.available |
2013-05-30T10:45:40Z |
|
| dc.date.issued |
2013-05-30 |
|
| dc.identifier |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421998000200002 |
|
| dc.identifier |
http://www.doaj.org/doaj?func=openurl&genre=article&issn=01004042&date=1998&volume=21&issue=2&spage=121 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/jspui/handle/123456789/4175 |
|
| dc.description |
Rare earth elements supported in zeolites are the most important catalysts in the fluid cracking of petroleum. The solid state ion exchange of Eu3+ in Y zeolite was investigated. First of all, the hydrated EuCl3 was well mixed in a ball mill and was then heated at 300ºC for different times. The quantitative determination of Eu3+ showed that the degree of ion exchange depends on the reaction time at constant temperature, being ~95% in 4 h. The X-ray study showed that the crystallinity of the zeolite is little affected by the exchange procedure. The study of spectroscopic properties of Eu3+, emission spectra and lifetime, give information about the migration and position of the ion in the zeolite cages. |
|
| dc.publisher |
Sociedade Brasileira de Química |
|
| dc.source |
Química Nova |
|
| dc.subject |
europium |
|
| dc.subject |
Y zeolites |
|
| dc.subject |
ion exchange |
|
| dc.title |
Troca iônica no estado sólido de európio3+ em zeólita Y: influência do tempo de reação |
|