Rate enhancement by Cu in NixCu1−x/ZrO2 bimetallic catalysts for hydrodeoxygenation of stearic acid

Christoph Denk; Sebastian Foraita; Libor Kovarik; Kelsey Stoerzinger; Yue Liu; Eszter Baráth; Johannes A. Lercher

doi:10.1039/C9CY00181F

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Rate enhancement by Cu in Ni_xCu_1−x/ZrO₂ bimetallic catalysts for hydrodeoxygenation of stearic acid†

Christoph Denk,^a Sebastian Foraita,^a Libor Kovarik,^bc Kelsey Stoerzinger,

^bd Yue Liu,

^a Eszter Baráth

*^a and Johannes A. Lercher*^ab

Author affiliations

* Corresponding authors

^a Department of Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraβe 4, 85747 Garching, Germany
E-mail: eszter.barath@tum.de, johannes.lercher@ch.tum.de

^b Institute for Integrated Catalysis, Pacific Northwest National Laboratory, 902 Battelle Boulevard, Richland, WA 99352, USA

^c Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA

^d Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington WA 99352, USA

Abstract

Hydrodeoxygenation of stearic acid on Ni/ZrO₂ to n-heptadecane occurs via the reduction to 1-octadecanal, followed by decarbonylation of the aldehyde to n-heptadecane. Stearic acid binds stronger than 1-octadecanal on Ni, causing decarbonylation to start only once stearic acid is almost fully converted. This first step is enhanced by addition of Cu either in the form of Cu/ZrO₂ or in the form of a ZrO₂ supported Ni_xCu_1−x nano-alloy. Cu has not only a higher activity for the reduction of stearic acid, it also increases the activity of Ni for decarbonylation of 1-octadecanal by increasing the electron density of Ni in the bimetal catalyst. The combination of these two effects leads to high activity of Ni–Cu bimetallic catalysts.

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Article information

DOI: https://doi.org/10.1039/C9CY00181F
Article type: Paper
Submitted: 24 Jan 2019
Accepted: 10 Apr 2019
First published: 11 Apr 2019

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Catal. Sci. Technol., 2019,9, 2620-2629

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Rate enhancement by Cu in Ni_xCu_1−x/ZrO₂ bimetallic catalysts for hydrodeoxygenation of stearic acid

C. Denk, S. Foraita, L. Kovarik, K. Stoerzinger, Y. Liu, E. Baráth and J. A. Lercher, Catal. Sci. Technol., 2019, 9, 2620 DOI: 10.1039/C9CY00181F

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