In a recent article in ACS Catalysis by Remco Dalebout, Petra de Jongh and many other researchers from our group, as well as collaborators from Sorbonne, Utrecht and Paris, new insights into copper-based, zinc-promoted methanol synthesis catalysts are revealed. Using time-resolved X-ray absorption spectroscopy, it is found that on carbon-supported catalysts a major part of the zinc promoter was reduced and mixed with copper to form a CuZn alloy under high-pressure methanol synthesis conditions.