Table 1. The effect of Na content on the chemoselective hydrogenation of 3-nitrostyrene.

Catalyst	Na/Pt ratio a	Time (min)	Conv. (%)	Sel. (%)
2.16% Pt/FeO x	0	36	98.7	66.4
0.74% Na–2.16% Pt/FeO x	2.9	35	95.3	67.5
1.75% Na–2.16% Pt/FeO x	6.9	28	96.9	85.6
2.64% Na–2.16% Pt/FeO x	10.4	29	94.9	90.5
3.30% Na–2.16% Pt/FeO x	13.0	26	95.5	96.7
5.03% Na–2.16% Pt/FeO x	19.8	32	95.1	97.5
7.60% Na–2.16% Pt/FeO x	30	300	94.2	97.4

^aAtomic ratio. Pretreatment conditions: 5 ml toluene, 1 MPa H₂, 40 °C, 1 h. Reaction conditions: Pt/substrate = 0.22 mol%, 5 ml reaction mixture, 0.5 mmol substrate, toluene as solvent, o-xylene as internal standard.