Insights into Deactivation and Regeneration of an Industrial Cu/Ni/Cr-Al2O3 Catalyst During Aldehyde Hydrogenation

Titelangaben

Reinsdorf, Arne ; Korth, Wolfgang ; Jess, Andreas ; Terock, Michael ; Klasovsky, Florian ; Franke, Robert:
Insights into Deactivation and Regeneration of an Industrial Cu/Ni/Cr-Al2O3 Catalyst During Aldehyde Hydrogenation.
In: ChemCatChem. Bd. 8 (2016) Heft 23 . - S. 3592-3599.
ISSN 1867-3899
DOI: https://doi.org/10.1002/cctc.201601022

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Abstract

The deactivation of a heterogeneous Cu/Ni/Cr-Al2O3 aldehyde hydrogenation catalyst was studied using n-nonyl aldehyde as model reactant. The reaction network was experimentally determined in batch experiments at 180 °C and 25 bar with either fresh or spent catalyst and also w/o the presence of the catalyst. Accelerated aging was applied to stress the fresh catalyst under model reaction conditions for characterization and comparison to a spent catalyst from an industrial plant. The catalyst structure and morphology were studied by XRD and TEM/EDX. The carbon residues that strongly adsorb on the catalyst surface during hydrogenation were analyzed by BET, TGA, extraction, and chemical disintegration. The amount of strongly adsorbed heavy hydrocarbons was 10 w % for the spent catalyst, causing a decrease in pore volume by 30 %. Regeneration of the catalyst was successfully conducted via oxidation of the carbon residues.