Table 1.

Selective hydrogenation results of CALD over the different catalysts^a

Entry	Catalysts	Conversion (%) (CALD)	Selectivity (%)
			(CALC)	(HALD)	(HALC)
1	TiO2/Pt	93.1	16.2	62.5	21.7
2	CoOx/TiO2	0.9	–	–	–
3	CoOxPt/TiO2	92.4	82.1	14.5	3.3
4	CoOx/TiO2/Pt	91.3	81.5	13.9	4.3
5	CoOx/TiO2(900)/Ptb	89.8	80.3	14.3	4.7
6	CoOx/TiO2/Pt/TiO2	8.8	52.1	47.4	–
7	Al2O3/CoOx/TiO2/Ptc	90.2	77.8	15.9	5.8
8	Al2O3/Ptd	31.8	–	100	–
9	CoOx/Al2O3/Pt	18.5	39.1	60.7	–
10	CoOxPt/Al2O3	27.4	69.4	30.2	–
11	CoOx/Al2O3	0.2	–	–	–

^aReaction conditions: 30 mL of 0.8 mmol cinnamaldehyde in ethanol and 2 MPa H₂ were placed in 50 mL stainless-steel autoclave (65 °C for 1.5 h)

^bThe cycle number of TiO₂ is 900 for the catalysts. For all other catalysts, the cycle number of TiO₂ is 300

^cDense Al₂O₃ layer is used to guarantee the complete covering of CoO_x species

^dThe cycle number of Al₂O₃ is 100 for the Al₂O₃-based catalysts (Entries 8–11)