A lot of valuable products can be obtained by glycerol oxidation. Therefore one of the most important aspect is the selectivity of the process which is mainly determined by the nature of the catalyst employed. Au-Ag/Al2O3 catalysts have been here investigated using two different synthetic procedures (sol immobilization [SOL] and solvated metal atom dispersion [SMAD]). The catalyst characterization suggested a different distribution of the metals. In particular SOL derived catalysts appeared mostly alloyed structure whereas SMAD seems to provide mainly core-shell nanoparticles. The two systems presented a strongly different selectivity: the first allowing the production of tartronic acid whereas the second not able to go beyond the glyceric acid step. To be noted that tartronic acid is not formed nor with Ag or Au monometallic systems.
Gold-Silver catalysts: effect of catalyst structure in the selectivity of glycerol oxidation
Claudio Evangelisti;
2017
Abstract
A lot of valuable products can be obtained by glycerol oxidation. Therefore one of the most important aspect is the selectivity of the process which is mainly determined by the nature of the catalyst employed. Au-Ag/Al2O3 catalysts have been here investigated using two different synthetic procedures (sol immobilization [SOL] and solvated metal atom dispersion [SMAD]). The catalyst characterization suggested a different distribution of the metals. In particular SOL derived catalysts appeared mostly alloyed structure whereas SMAD seems to provide mainly core-shell nanoparticles. The two systems presented a strongly different selectivity: the first allowing the production of tartronic acid whereas the second not able to go beyond the glyceric acid step. To be noted that tartronic acid is not formed nor with Ag or Au monometallic systems.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
