| Journal: | Materials research |
| Database: | PERIÓDICA |
| System number: | 000312412 |
| ISSN: | 1516-1439 |
| Authors: | Jordao, Maura H1 Valencia, Eduardo2 Vicemario, Simoes Cardoso, Dilson |
| Institutions: | 1Universidade Federal de Sao Carlos, Departamento de Engenharia Quimica, Sao Carlos, Sao Paulo. Brasil 2Universidad Central "Marta Abreu" de Las Villas, Santa Clara, Villa Clara. Cuba |
| Year: | 1999 |
| Season: | Jul |
| Volumen: | 2 |
| Number: | 3 |
| Pages: | 219-223 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental |
| English abstract | Bifunctional catalysts formed by metals (nickel, platinum as well as an association of both metals) supported in an ultrastabilized Y molecular sieve (USY) were prepared. The samples were obtained using a competitive ion exchange method, followed by calcination and reduction of the transition metal under hydrogen atmosphere. The solids were characterized by ICP for their chemical composition, XRD, TEM and the catalytic properties evaluated in the isomerization of the n-hexane. It was observed that the NH4USY zeolite support presented better ion exchange efficiency in comparison to that of the zeolite HUSY, due to the decrease of the pH of the reaction medium in the last case. The TEM images of the catalysts, obtained in both bright and dark field, showed that the metal particles are dispersed almost inside the molecular sieve micro and mesopores. TEM images of the catalysts obtained in bright field showed that the average particle diameter were 64 and 108 Å for platinum and nickel respectively and about 70 Å when both metals are present. In the mentioned reaction, platinum catalysts were more active and stable than the nickel ones and the catalysts formed by both metals (0,2%Pt + 0,8% Ni/HUSY) presented the highest activity |
| Disciplines: | Ingeniería, Química |
| Keyword: | Ingeniería de control, Ingeniería de materiales, Fisicoquímica y química teórica, Catalizadores, Metales, Platino, Níquel, Zeolita, Isomerización |
| Keyword: | Engineering, Chemistry, Control engineering, Materials engineering, Physical and theoretical chemistry, Catalysts, Metals, Platinum, Nickel, Zeolite, Isomerization |
| Full text: | Texto completo (Ver HTML) |
