Sulfated Zirconia
Mostrando 1-5 de 5 artigos, teses e dissertações.
-
1. Esterificação de ácidos graxos utilizando zircônia sulfatada e compósitos carvão ativado/zircônia sulfatada como catalisadores
In this work sulfated zirconia (SZr) and activated carbon/SZr composites produced by impregnation method with or without heating treatment step (CABC/SZr-I and CABC/SZr-I SC) and by the method of synthesis of SZr on the carbon (CABC/SZr-S) was used as catalysts in the esterification reactions of fatty acids. The SZr presented very active, conversions higher
Química Nova. Publicado em: 2011-09
-
2. Synthesis of biodiesel from Neem oil using sulfated zirconia via tranesterification
Sulfated zirconia (SZ) is a widely used catalyst, which is synthesized by a solvent free method and the synthesized catalyst has been characterized. Neem Methyl Ester (Biodiesel) was prepared by a two-step process of esterification and transesterification from Neem oil with methanol in the presence of catalyst. Acid catalyst was used for the esterification a
Brazilian Journal of Chemical Engineering. Publicado em: 2010-12
-
3. A mild and efficient method for the chemoselective synthesis of acylals from aromatic aldehydes and their deprotections catalyzed by sulfated zirconia
Aldeídos podem ser convertidos a acilas por tratamento com anidrido acético na presença de zircônia sulfatada a 0 ºC, com excelentes rendimentos. Cetonas e aldeídos alifáticos não são afetados nessas condições de reação. A desproteção das acilas resultantes é obtida usando-se o mesmo catalisador a 60 ºC. O catalisador pode ser reutilizado po
Journal of the Brazilian Chemical Society. Publicado em: 2005-06
-
4. Desenvolvimento de catalisadores de óxido de ferro ou óxido de zirconio sulfatado para a redução de óxidos de nitrogênio com propano.
Nitrogen oxides are responsible for the three of the main phenomena related global pollution. The photochemical smog, the acid rain and the pollution of continental water by nitrate species, as well as the greenhouse effect, are related to nitrogen compounds. In the last decades several technologies have been proposed and used to reduce the emissions of nitr
Publicado em: 2004
-
5. Efeito das condições de preparação sobre as propriedades do óxido de zircônio sulfatado contendo ferro.
Sulfated oxide-based catalysts have found several industrial applications mainly in reactions which demand for strong acid sites. In order to develop methods to get acidic oxides, the effect of the preparation methods on the properties of iron-doped zirconia oxides was studied in this work.The precursors were prepared by process sol-gel from iron nitrate and
Publicado em: 2004