Figure 8.

Reusability test of the 2Pt/ZrO₂-550-R250 catalyst for the conversion of glycerol and transfer hydrogenation: (A) Catalytic performance upon recycling; the solid catalyst was recovered by filtration, washed with water and ethanol, and dried at 100 °C after each run. (B) TEM picture of the catalyst after 5 recycles; average particle size of Pt: 4.6 nm. Reaction conditions: aqueous glycerol solution: 10 mmol (0.5 M, 20 mL); cyclohexene: 20 mmol; nominal Pt/glycerol ratio = 1/1950; NaOH: 15 mmol; temperature: 160 °C; reaction time: 4.5 h; N₂ pressure: 20 bar.