TU Darmstadt / ULB / TUbiblio

Ni/SiO₂ catalysts prepared with ethylenediamine nickel precursors: Influence of the pretreatment on the catalytic properties in glucose hydrogenation

Schimpf, Sabine and Louis, Catherine and Claus, Peter (2007):
Ni/SiO₂ catalysts prepared with ethylenediamine nickel precursors: Influence of the pretreatment on the catalytic properties in glucose hydrogenation.
In: Applied Catalysis A: General, pp. 45-53, 318, [Online-Edition: http://dx.doi.org/10.1016/j.apcata.2006.10.034],
[Article]

Abstract

Nickel catalysts prepared with different metal loadings (5, 10, and 20 wt% Ni) by impregnation with nickel ethylenediamine complexes revealed small nickel particles (mean diameter: 2–3 nm) after reduction, even for high metal loadings (20 wt%). When used in the hydrogenation of glucose, these catalysts show almost no nickel leaching compared to a commercial Ni/SiO2 catalyst (prepared by precipitation, 67 wt% Ni), but they are slightly less active (TOF: 2 to 10 × 10−3 s−1) than a commercial nickel/silica catalyst (TOF: 14 × 10−3 s−1) and revealed lower yields to sorbitol (3–42% compared to 60%). The catalytic results depend on the pretreatment conditions performed. When the catalysts are calcined before reduction, higher conversion (19–45%) and selectivity to sorbitol (81–92%) are obtained than when they are directly reduced without calcination pretreatment (conversion: 10–16% and selectivity to sorbitol: 21–59%) after 5 h of reaction time, respectively. The difference was ascribed to the fact that complete decomposition of the nickel ethylenediamine precursor was achieved only when calcination pretreatment was performed. Indeed, when the catalysts were directly reduced, X-ray photoelectron spectroscopy (XPS) revealed a nitrogen-compound probably responsible for lower conversion and higher selectivities to fructose and mannose, indicating Lobry de Bruyn-Alberda van Ekenstein rearrangement. However, no nickel sintering was observed in contrast to the catalyst calcined before reduction.

Item Type: Article
Erschienen: 2007
Creators: Schimpf, Sabine and Louis, Catherine and Claus, Peter
Title: Ni/SiO₂ catalysts prepared with ethylenediamine nickel precursors: Influence of the pretreatment on the catalytic properties in glucose hydrogenation
Language: English
Abstract:

Nickel catalysts prepared with different metal loadings (5, 10, and 20 wt% Ni) by impregnation with nickel ethylenediamine complexes revealed small nickel particles (mean diameter: 2–3 nm) after reduction, even for high metal loadings (20 wt%). When used in the hydrogenation of glucose, these catalysts show almost no nickel leaching compared to a commercial Ni/SiO2 catalyst (prepared by precipitation, 67 wt% Ni), but they are slightly less active (TOF: 2 to 10 × 10−3 s−1) than a commercial nickel/silica catalyst (TOF: 14 × 10−3 s−1) and revealed lower yields to sorbitol (3–42% compared to 60%). The catalytic results depend on the pretreatment conditions performed. When the catalysts are calcined before reduction, higher conversion (19–45%) and selectivity to sorbitol (81–92%) are obtained than when they are directly reduced without calcination pretreatment (conversion: 10–16% and selectivity to sorbitol: 21–59%) after 5 h of reaction time, respectively. The difference was ascribed to the fact that complete decomposition of the nickel ethylenediamine precursor was achieved only when calcination pretreatment was performed. Indeed, when the catalysts were directly reduced, X-ray photoelectron spectroscopy (XPS) revealed a nitrogen-compound probably responsible for lower conversion and higher selectivities to fructose and mannose, indicating Lobry de Bruyn-Alberda van Ekenstein rearrangement. However, no nickel sintering was observed in contrast to the catalyst calcined before reduction.

Journal or Publication Title: Applied Catalysis A: General
Volume: 318
Uncontrolled Keywords: Hydrogenation; Glucose; Sorbitol; Nickel catalysts; Leaching
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Technische Chemie > Technische Chemie II
07 Department of Chemistry > Fachgebiet Technische Chemie
Date Deposited: 20 Mar 2009 08:59
Official URL: http://dx.doi.org/10.1016/j.apcata.2006.10.034
Additional Information:

Available online 28. November 2006

Identification Number: doi:10.1016/j.apcata.2006.10.034
Export:
Suche nach Titel in: TUfind oder in Google

Optionen (nur für Redakteure)

View Item View Item