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Reactive metal-support interaction in the Cu-In2O3 system: intermetallic compound formation and its consequences for CO2-selective methanol steam reforming
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Reactive metal-support interaction in the Cu-In2O3 system: intermetallic compound formation and its consequences for CO2-selective methanol steam reforming
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Journal Article
Reactive metal-support interaction in the Cu-In2O3 system: intermetallic compound formation and its consequences for CO2-selective methanol steam reforming
2019
Overview
The reactive metal-support interaction in the Cu-In
2
O
3
system and its implications on the CO
2
selectivity in methanol steam reforming (MSR) have been assessed using nanosized Cu particles on a powdered cubic In
2
O
3
support. Reduction in hydrogen at 300 °C resulted in the formation of metallic Cu particles on In
2
O
3
. This system already represents a highly CO
2
-selective MSR catalyst with ~93% selectivity, but only 56% methanol conversion and a maximum H
2
formation rate of 1.3 µmol g
Cu
−1
s
−1
. After reduction at 400 °C, the system enters an In
2
O
3
-supported intermetallic compound state with Cu
2
In as the majority phase. Cu
2
In exhibits markedly different self-activating properties at equally pronounced CO
2
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 g
Cu
−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 In
2
O
3
. In essence, the results also open up the pathway to in-depth development of potentially CO
2
-selective bulk intermetallic Cu-In compounds with well-defined stoichiometry in MSR.
Publisher
Taylor & Francis,Taylor & Francis Ltd,IOP Publishing,Taylor & Francis Group
