1. Reactive metal-support interaction in the Cu-In2O3 system: intermetallic compound formation and its consequences for CO2-selective methanol steam reforming
- Author
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Dagmar Obendorf, Johannes Bernardi, Marc Armbrüster, Lukas Schlicker, Aleksander Gurlo, Lei Zhang, Andrew Doran, Kevin Ploner, Bernhard Klötzer, Simon Penner, and Albert Gili
- Subjects
Catalyst / Photocatalyst / Photosynthesis ,106 Metallic materials ,Intermetallic ,Optical Physics ,02 engineering and technology ,212 Surface and interfaces ,01 natural sciences ,Energy Materials ,Steam reforming ,chemistry.chemical_compound ,503 TEM, STEM, SEM ,General Materials Science ,Materials ,X-ray / Neutron diffraction and scattering ,STEM ,cu2in ,Condensed Matter Physics ,504 X-ray / Neutron diffraction and scattering ,021001 nanoscience & nanotechnology ,visual_art ,SEM ,Surface and interfaces ,visual_art.visual_art_medium ,0210 nano-technology ,Selectivity ,in situ X-ray diffraction ,Materials science ,lcsh:Biotechnology ,chemistry.chemical_element ,reduction ,Focus on Intermetallic Catalysts ,010402 general chemistry ,Metal ,lcsh:TP248.13-248.65 ,lcsh:TA401-492 ,205 Catalyst / Photocatalyst / Photosynthesis ,Metallic materials ,in situ x-ray diffraction ,cubic indium oxide ,Cu2In ,50 Energy Materials ,Materials Engineering ,Copper ,0104 chemical sciences ,chemistry ,Chemical engineering ,copper ,TEM ,lcsh:Materials of engineering and construction. Mechanics of materials ,Methanol - Abstract
The reactive metal-support interaction in the Cu-In2O3 system and its implications on the CO2 selectivity in methanol steam reforming (MSR) have been assessed using nanosized Cu particles on a powdered cubic In2O3 support. Reduction in hydrogen at 300 °C resulted in the formation of metallic Cu particles on In2O3. This system already represents a highly CO2-selective MSR catalyst with ~93% selectivity, but only 56% methanol conversion and a maximum H2 formation rate of 1.3 µmol gCu−1 s−1. After reduction at 400 °C, the system enters an In2O3-supported intermetallic compound state with Cu2In as the majority phase. Cu2In exhibits markedly different self-activating properties at equally pronounced CO2 selectivities between 92% and 94%. A methanol conversion improvement from roughly 64% to 84% accompanied by an increase in the maximum hydrogen formation rate from 1.8 to 3.8 µmol gCu−1 s−1 has been observed from the first to the fourth consecutive runs. The presented results directly show the prospective properties of a new class of Cu-based intermetallic materials, beneficially combining the MSR properties of the catalyst’s constituents Cu and In2O3. In essence, the results also open up the pathway to in-depth development of potentially CO2-selective bulk intermetallic Cu-In compounds with well-defined stoichiometry in MSR., Graphical abstract
- Published
- 2019
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