Nanonickel particles supported on silica. Morphology effects on their surface and hydrogenating properties

We have studied a whisker-like nickel phase supported on silica and obtained by the reduction of nickel acetate in aqueous hydrazine media. Under H2/300 °C flow, the obtained phase remains stable when the reduction is carried out at 70 °C for 2 h whereas it totally tranforms to spherical-like partic...

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Veröffentlicht in:Catalysis letters 2004-09, Vol.97 (3-4), p.177-183
Hauptverfasser: BOUDJAHEM, Abdel-Ghani, MONTEVERDI, Serge, MERCY, Michel, BETTAHAR, Mohammed M
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Sprache:eng
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Zusammenfassung:We have studied a whisker-like nickel phase supported on silica and obtained by the reduction of nickel acetate in aqueous hydrazine media. Under H2/300 °C flow, the obtained phase remains stable when the reduction is carried out at 70 °C for 2 h whereas it totally tranforms to spherical-like particles when the reduction is performed at 80 °C for 30 min after a gradual heating from room temperature. It is shown that the whisker-like nickel phase adsorbs and stores more hydrogen than the spherical-like nickel particles. It also exhibits a higher activity in the gas phase hydrogenation of benzene (3-4 times greater). In acetylene hydrogenation, it strongly favors the cylotrimerization process to benzene at the expense of the processes to linear C2-C4hydrocarbons. This work is a direct demonstration of the influence of the metal phase morphology of nickel supported catalysts on their surface and catalytic properties.
ISSN:1011-372X
1572-879X
DOI:10.1023/b:catl.0000038581.80872.7b