This PDF file includes:

• Supplementary Text
  
• fig. S1. Structure and electronic properties of 1-butene.
  
• fig. S2. Hydrogenation pathways of isophorone on Pd(111).
  
• fig. S3. Adsorption structures of isophorone on Pd(111).
  
• fig. S4. MODOS of isophorone on metal surfaces.
  
• fig. S5. MODOS of acrolein on metal surfaces.
  
• fig. S6. Coadsorption structure of isophorone on Pd(111).
  
• fig. S7. Isophorone on Pd(111) at high coverage.

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