| Journal: | Brazilian journal of chemical engineering |
| Database: | PERIÓDICA |
| System number: | 000309083 |
| ISSN: | 0104-6632 |
| Authors: | Meira, D.M1 Cortez, G.G Monteiro, W.R2 Rodrigues, J.A.J |
| Institutions: | 1Faculdade de Engenharia Quimica de Lorena, Departamento de Engenharia Quimica, Lorena, Sao Paulo. Brasil 2Instituto Nacional de Pesquisas Espaciais, Laboratorio Associado de Combustao e Propulsao, Cachoeira Paulista, Sao Paulo. Brasil |
| Year: | 2006 |
| Season: | Sep |
| Volumen: | 23 |
| Number: | 3 |
| Pages: | 351-358 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Experimental, aplicado |
| English abstract | Vanadium oxide supported on hydrotalcite-type precursors was studied in the oxidation of isopropanol. Hydrotalcites with different y = Mg/Al ratios were synthesized by the method of coprecipitation nitrates of Mg and Al cations with K2CO3 as precipitant. The decomposition of these hydrotalcite precursors at 450°C yielded homogeneous MgyAlOx mixed oxides that contain the Al+3 cations totally incorporated into the MgO framework. The materials were characterized by chemical analysis, BET superficial area, X-ray diffraction, temperature-programmed reduction (TPR) and the reaction of isopropanol, a probe molecule used to evaluate the acid-base properties. The results of TPR showed that the reducibility of V+5 decreased with the increase in magnesium loading in catalysts. The X-ray diffraction patterns of Al-rich hydrotalcite precursors showed the presence of crystalline phases of brucite and gibbsite. It was shown that chemical composition, texture, acid-base properties of the active sites and also Mg/Al ratio strongly affect the formation of the products in the oxidation of isopropanol. The Al-rich catalysts were much more active than the Mg-rich ones, converting isopropanol mainly to propylene |
| Disciplines: | Química |
| Keyword: | Ingeniería química, Isopropanol, Oxidación, Catálisis, Hidrotalcitas, Oxido de vanadio |
| Keyword: | Chemistry, Chemical engineering, Isopropanol, Oxidation, Catalysis, Hydrotalcites, Vanadium oxide |
| Full text: | Texto completo (Ver HTML) |
