Nota de FísicaPublicado
HYPERFINE/CHEMICAL CHARACTERIZATION OF HETEROGENEOUS CATALYSTS: Pt-In/Nb2O5 SYSTEMS
Fabio B. Passos; Ingridy S. Lopes; Paulo Roberto de Jesus Silva; Henrique Saitovitch
2002
Dados da publicação
- Autores
- Fabio B. Passos; Ingridy S. Lopes; Paulo Roberto de Jesus Silva; Henrique Saitovitch
- Tipo
- Nota de Física
- Status
- Publicado
- Data de publicação
- 2002
- Descrição
- Pt-In/Nb2O5 catalysts were investigated using Temperature Programmed Reduction and Time Differential Angular Correlation experiments. The results indicated the presence of In-O complexes for low loading In/Nb2O5 and Pt-In/Nb2O5 catalysts after calcination. These complexes did not form In2O3 crystalline phase. After reduction for Pt-In/Al2O3, although it was not possible to determine univocally the surface structure, it was evidenced In is present in different states. A fraction of In atoms is bonded to niobia surface, as a surface complex that does not show crystalline structure similar to bulk In2O3. Other fraction of In atoms interacts with platinum, in the form of an alloy, in locations that present trigonal symmetry.
- Ano
- 2002
- Número
- CBPF-NF-015/02
- Vínculo com tese
- Não
- Vínculo com bolsa
- Não