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vol.48 número2ELECTROTOPOLOGICAL STATE STUDIES OF COPPER(II) COMPLEXES WITH alpha-AMINOACIDATESSTEREOSELECTIVE SYNTHESIS OF 3-alpha-CHLORO-3-EXO-DECANOYL CAMPHOR índice de autoresíndice de assuntospesquisa de artigos
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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

ORELLANA, Fresia; PLAZA DE LOS REYES, Jorge  e  URIZAR, Silvio. Ru/SiO2 AND CuRu/SiO2 PREPARED BY SOL-GEL: EFFECT OF pH AND WATER AMOUNT. J. Chil. Chem. Soc. [online]. 2003, vol.48, n.2, pp.33-38. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072003000200006.

Ru(1%)/SiO2 and Cu(1%)Ru(1%)/SiO2 catalysts were prepared by cogelation. The effect of pH and the amount of water on the physical-chemical properties and the catalytic properties of them were analyzed. The acid medium increased the formation of microporosity and the formation of small size of metallic ruthenium particle. The variation of the water quantity used in the gelation not modify considerably the texture neither the dispersion of the noble metal. The reduction level of all prepared catalyst was similar, showing displacement in some of reduction peaks. The toluene hydrogenation indicated that the conversion and the quantity of hydrogenate product varied with the pH and the quantity of water used in the gelation. The addition of copper to Ru/SiO2 catalysts diminished the reactive conversion and their hydrogenant activity

Palavras-chave : Sol-gel; tetraethoxysilane; hydrodechlorynation; 1,2-dichloroethane; selectivity.

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