Table 2. Catalytic Conversion of Glycerol to Lactic Acid Using a Pt/ZrO₂ Prepared with Different Reduction Methods^a.

					Selectivity in the conversion of glycerol (%)				Yield in the conversion of cyclohexene (%)b
Entry	Catalyst	Conv.GLY (%)	YLA (%)	S(transfer-H) (%)	Lactic acid	Glyceric acid	Glycolic acid	Propanediol	Cyclohexane	Benzene
1	2Pt/ZrO2-550	57	55	35	97	0.9	0.5	1.8	8.9	0.5
2	2Pt/ZrO2-550-R100	56	54	27	97	1.2	0.6	1.0	7.7	0
3	2Pt/ZrO2-550-R250	96	95	36	99	0.5	0.2	0.7	17	0
4	2Pt/ZrO2-550-R400	88	85	41	97	0.9	0.5	1.4	18	0
5	2Pt/ZrO2-DR250	71	69	15	97	1.0	0.0	1.6	5.1	0

^aReaction 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.

^bUnder the employed reaction conditions (mol_glycerol:mol_cyclohexene = 1:2) the maximum theoretical yield of cyclohexane is 50%.