โ Scribed by Massimiliano Comotti; Cristina Della Pina; Michele Rossi
No coin nor oath required. For personal study only.
Mono-and bimetallic catalysts (Au, Pt, Pd and Rh) in form of supported particles or colloidal dispersions were tested in the aerobic oxidation of d-glucose to d-gluconic acid in water solution under mild conditions. Whereas the activity of single metals under acidic conditions was weak in the case of Au and Pt (TOF = 51-60 h -1 ) and very low in the case of Rh and Pd (TOF < 2), the activity of the bimetallic particles resulted enhanced by combining Au with Pd and Pt. In the latter case high TOFs (max 924 h -1 ) allow a new route to the synthesis of gluconic acid.
In the presence of alkali at pH 9.5, the oxidation of glucose to gluconate resulted remarkably improved either in the case of monometallic gold or bimetallic catalysts, but no evident synergetic effects among metals have been detected.
๐ SIMILAR VOLUMES
A catalyst was made by entrapping glucose oxidase in a polymeric film deposited on an electrode surface. Its efficiency was studied by measuring the transformation of glucose by oxygen into gluconic acid. A numerical model was elaborated and validated with respect to experimental data. The electroch
The higher stability of the picket-fence porphyrin derivatives relative to those obtained with other porphyrins (H,TPP, H,TPFPP, H,TMPf2. 3 , 'I) indicates that the 0x0 group of the Mn=O moiety of 2 probably lies in the hydrophobic cavity formed by the four pivalamide pickets of this porphyrin.