Table 2. Relative conversion rates of ST and NB in their hydrogenation over Rh-based catalysts.

Mode	Catalyst	r ST/rNB	r NB/(rNB + rST) a	Sel. b
Alone	Rh/SiO2	9.5	—	—
	RhZn/SiO2	4.8	—	—
	RhIn/SiO2	1.9	—	—
Together	Rh/SiO2	13	0.07	0.03
	RhZn/SiO2	1.1	0.48	0.50
	RhIn/SiO2	0.04	0.96	0.97

^aNitro hydrogenation selectivity (1 + r_ST/r_NB)^–1.

^bAS selectivity at 50% conversion in NS hydrogenation.