Fig. 7. Kinetic study for the hydrolysis of saha hdac by different solid acids. Reaction conditions: 30 mg cellulose, 30 mg solid catalysts, 3 mL H2O, at 150 °C (black line). Fe3O4-RGO-SO3H (blue line), Amberlyst-15 (red line), 0.0156 mol/L H2SO4, (■) glucose yield (●) degradation products yield. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)Figure optionsDownload full-size imageDownload as PowerPoint slide
In accordance with Eq. (1), the glucose-production rate is:equation(2)dCGdt=k1CC-k2CGwhich, integrated, lead to:equation(3)CG=CG0k1k1-k2[exp(-k2t)-exp(-k1t)]
The values of the kinetic constants k1 and k2 were obtained by the simplex method, and the values are presented in Table 4. As expected, the results once again proved that Fe3O4-RGO-SO3H exhibited much higher activity than Amberlyst-15 and 0.0156 mol/L H2SO4 for cellulose hydrolysis.
Experimental values of the kinetic constants k1 and k2.Catalystk1 × 103 (h−1)k2 × 103 (h−1)Fe3O4-RGO-SO3H144.32295.43Amberlyst-15124.89197.720.0156 mol/L H2SO414.845.9Full-size tableTable optionsView in workspaceDownload as CSV