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Schematic diagram showing ethanol production from syngas inside Rh-loaded carbon nanotubes. The black spheres denote carbon atoms, which form the graphene layers of the carbon nanotubes. The streams in light orange and green entering the nanotubes indicate the gas mixture of CO and H2, respectively. The three stacks of small spheres in rose, blue, green and red inside the tubes represent catalyst particles that may comprise more than one component. The streams in light cyan tailing behind the catalyst particles along the axis of the nanotubes represent ethanol. (Image - Nature Publishing Group)