Ni- and Zn-Doping Effects on Cu/SiO2 Catalysts in Nonoxidative Ethanol Dehydrogenation
Tomas Pokorny, Petr Machac, Zdenek Moravec, Lucie Simonikova, Lucie Leonova, Zuzana Hlavenkova, David Skoda, Katerina Pacultova, Katerina Karaskova, Ales Styskalik
TL;DR
This paper studies how adding Ni and Zn to Cu/SiO2 catalysts affects their performance in converting ethanol to acetaldehyde and butadiene at lower temperatures.
Contribution
The study introduces Ni- and Zn-doped Cu/SiO2 catalysts that improve activity and stability in ethanol dehydrogenation.
Findings
Ni-doped catalysts showed higher activity at lower temperatures but deactivated faster.
Zn-doped catalysts improved high-temperature stability and maintained high acetaldehyde selectivity.
Zn-doped catalysts produced 3.63 g g–1 h–1 acetaldehyde at 290 °C with reduced coke formation.
Abstract
Nonoxidative ethanol dehydrogenation opens a pathway for the sustainable production of acetaldehyde and butadiene. One crucial aspect of producing butadiene by the Lebedev process is the high-temperature stability of ethanol to acetaldehyde conversion. However, copper-based catalysts, despite exhibiting high activity and selectivity, suffer from sintering and coking and need to be improved for successful industrial applications. Herein, we show Cu-based (∼2.5 wt %) catalysts doped with Ni and Zn (0.028–0.36 wt %) to improve the catalytic performance of nanoparticles. The catalysts were prepared by hydrolytic sol–gel and dry impregnation methods. STEM analysis determined the nanoparticle sizes in the 1.9–2.8 nm range. Ni-doped catalysts outperformed the parent Cu catalysts in ethanol dehydrogenation activity at lower temperatures (185–220 °C) but suffered from faster deactivation. The…
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Taxonomy
TopicsCatalysts for Methane Reforming · Catalysis and Oxidation Reactions · Catalysis for Biomass Conversion