Hydrierung von Crotonaldehyd und Acetaldol mit modifizierten Pd-Trägerkatalysatoren. II. Zum Einfluß einer Chromiummodifizierung auf Pd Al2O3-Katalysatoren

✍ Scribed by Dr. D. Bohm; Prof. Dr. P. Kripylo; J. Stobbe

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 348 KB
• Volume: 332
• Category: Article
• ISSN: 1615-4150
• DOI: 10.1002/prac.19903320626

✦ Synopsis

Hydrogenation of Crotonaldehyde and Acetaldol with Modified Pd‐Supported Catalysts. II. On the Influence of a Chromium Modification of Pd/Al~2~O~3~ Catalysts

The catalytic properties in hydrogenation reactions on chromium containing Pd/Al~2~O~3~ catalysts are influenced by an “esemble effect.” The specific activity in the hydrogenation of crotonaldehyde to n‐butyraldehyde is independent of the chromium content in the Pd/Al~2~O~3~ catalysts. But the specific activity for the hydrogenolysis of ethane is decresed with the chromium content of the catalysts. On the other hand, was observed that the specific activity of the conversion of acetaldol to n‐butyraldehyde rises with increasing chromium content. This specific activity is higher than the specific hydrogenation activity.

This fact can be considered as an argument for an asynchron hydrogenolysis of the hydroxyl group in the formation of n‐butyraldehyde from acetaldol on PdCr/Al~2~O~3~ catalysts.