Palladium propanediol oxidation

Aerobic Palladium-Catalyzed Oxidation of Acrolein to Malonaldehyde Bls-(1,3-dloxan-2-yl]-acetal Followed by Hydrolysis/Hydrogenation to 1,3-Propanediol... 

Catalytic oxidation of vicinal diols to a-hydroxy carboxylates was performed by Prati and Rossi [82] in alkaline aqueous solution with gold-based catalysts prepared by deposition-precipitation with sodium carbonate from HAUCI4 solutions on active carbon suspension. The 1 % Au/C catalysts had remarkable properties compared with conventional Pt/C and Pd/C catalysts in terms of selectivity and stability. Thus, Table 1 shows that at pH 8,1,2-propanediol was very selectively oxidized to lactic acid, which indicates that gold was more selective than platinum and palladium in the oxidation of the primary alcohol function. The activity of gold catalysts was also very stable as a function of conversion or after several recycles, indicating that gold is less sensitive to over-oxidation and/or self-poisoning than platinum and palladium. 

Aqueous solutions of 1,3 propanediol were oxidized at pH 11 in the presence of palladium catalysts (2.8% Pd relative to 1,3-propanediol) the maximum yield of malonic acid was 86.1 % [99]. 

Figure 11.3 outlines our three-step route from acrolein to 1,3-propanediol based on the palladium-catalyzed aerobic oxidation as presented in Section 11.2.2. 

Dimitratos, N., Lopez-Sanchez, J., Meenakshisundaram, S., etal. (2009). Selective Formation of Lactate by Oxidation of 1,2-Propanediol Using Gold Palladium Alloy Supported Nanocrystals,... 

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