Cr–Containing Magnetic Oxides in a Methanol Synthesis: Does Cr Ion Distribution Matter?

Here, we report on the development of novel Cr‐containing magnetic oxide nanoparticles (NPs) as catalysts for a syngas‐to‐methanol reaction which constitutes a sustainable route to obtain value‐added chemicals. These NPs have been synthesized in a one‐pot reaction by thermal decomposition of Cr acet...

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Veröffentlicht in:ChemistrySelect (Weinheim) 2017-07, Vol.2 (22), p.6269-6276
Hauptverfasser: Baird, Nicholas, Dittmar, Jasper W., Losovyj, Yaroslav B., Pink, Maren, Morgan, David Gene, Stein, Barry D., Torozova, Alexandra S., Krasnova, Irina Yu, Grigoriev, Maxim E., Sidorov, Alexander I., Sulman, Mikhail G., Shifrina, Zinaida B., Bronstein, Lyudmila M.
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container_issue 22
container_start_page 6269
container_title ChemistrySelect (Weinheim)
container_volume 2
creator Baird, Nicholas
Dittmar, Jasper W.
Losovyj, Yaroslav B.
Pink, Maren
Morgan, David Gene
Stein, Barry D.
Torozova, Alexandra S.
Krasnova, Irina Yu
Grigoriev, Maxim E.
Sidorov, Alexander I.
Sulman, Mikhail G.
Shifrina, Zinaida B.
Bronstein, Lyudmila M.
description Here, we report on the development of novel Cr‐containing magnetic oxide nanoparticles (NPs) as catalysts for a syngas‐to‐methanol reaction which constitutes a sustainable route to obtain value‐added chemicals. These NPs have been synthesized in a one‐pot reaction by thermal decomposition of Cr acetylacetonate and doping metal acetylacetonates (if used) in the reaction solution of preformed magnetite NPs stabilized by polyphenylquinoxaline. For all the samples, the NP surface is enriched with Cr. At the same time, the Cr species are finely dispersed in the magnetite phase. This exposes Cr catalytic species to reacting molecules and creates an intimate contact between Cr3+ and Fe3O4. As a result, the methanol productivity rate for the Cr‐containing magnetic oxide prepared with 0.5 mmol of the Cr precursor is approximately three orders of magnitude higher than that for the conventional Cu/ZnO/Al2O3 catalyst. Additional doping of this Cr‐containing magnetic oxide with small amounts of Ni or La leads to even higher catalytic activity (by 40–49%). Enhanced catalysis: A close contact between Cr3+ and Fe3O4 species and the enrichment of the nanoparticle surface with Cr ions ensure exceptional catalytic properties of these catalysts in the reaction of syngas to methanol and their high stability during repeated use.
doi_str_mv 10.1002/slct.201700982
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These NPs have been synthesized in a one‐pot reaction by thermal decomposition of Cr acetylacetonate and doping metal acetylacetonates (if used) in the reaction solution of preformed magnetite NPs stabilized by polyphenylquinoxaline. For all the samples, the NP surface is enriched with Cr. At the same time, the Cr species are finely dispersed in the magnetite phase. This exposes Cr catalytic species to reacting molecules and creates an intimate contact between Cr3+ and Fe3O4. As a result, the methanol productivity rate for the Cr‐containing magnetic oxide prepared with 0.5 mmol of the Cr precursor is approximately three orders of magnitude higher than that for the conventional Cu/ZnO/Al2O3 catalyst. Additional doping of this Cr‐containing magnetic oxide with small amounts of Ni or La leads to even higher catalytic activity (by 40–49%). 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subjects catalysis
doping
magnetite
methanol synthesis
polymer
title Cr–Containing Magnetic Oxides in a Methanol Synthesis: Does Cr Ion Distribution Matter?
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