| abstract |
Aromatic and aliphatic aldehydes can be prepared from the corresponding aromatic or aliphatic carboxylic acids or their esters, anhydrides or halides at a higher temperature by catalytic gas-phase hydrogenation with hydrogen if a catalyst system comprising oxides of titanium and / or vanadium and one or more co- Uses metals, the co-metals being selected from the group consisting of chromium, molybdenum, cobalt, nickel, zinc, cadmium and copper. |