Figure 5

Effect of reaction time on HDA conversion, yield of dicarbamate and selectivity for reaction products. Reaction conditions: HDA, 200 mmol; ZnAlPO4, 1.0 g; DMC/HDA, 8; temperature, 353 K. (Legend: (□) HDA conversion; (○) yield of dicarbamate; (■), (●) and (▲), selectivity for selectivity for dicarbamate, monocarbamate and N-methylated-carbamate, respectively.)