Table 2. Summary of Catalysts Discussed Here for the Hydrogenation of CO₂ to Methanol.

catalyst	catalyst type	reaction conditions	TOF;a activity;b selectivity	ref
Cu/ZnO/Al2O3 (CZA)	commercial	T = 513 K; p = 2 MPa; H2:CO2 = 3; GHSV = 6000 h–1	activity = 3.17; selectivity for MeOH = 35%	(205)
CuZn/SiC	BMNP	T = 523 K; p = 0.1 MPa; CO2:H2 = 1:9 v/v	activity = 0.03; selectivity for MeOH = 5%	(200)
PdZn/SiC			activity = 0.23; selectivity for MeOH = 21%
PdCu/SiC			activity = 0; selectivity for MeOH = 0%
12.5PdCuZn/SiC	TMNP		activity = 0.07; selectivity for MeOH = 23%
25PdCuZn/SiC			activity = 0.14; selectivity for MeOH = 40%
37.5PdCuZn/SiC			activity = 0.30; selectivity for MeOH = 50%
Ni–Ga	BMNP	T = 533 K; p = 1 MPa; H2:CO2 = 3	TOF = 2880; activity = 1.2; selectivity for MeOH + DME = 43% (DME selectivity < 1%)	(203)
Au–Ni–Ga	TMNP		TOF = 11160; activity = 1.1; selectivity for MeOH + DME = 51% (DME selectivity < 1%)
Cu–Ni–Ga			TOF = 5040; activity = 1.8; selectivity for MeOH + DME = 56% (DME selectivity < 1%)
Co–Ni–Ga			TOF = 1800; activity = 1.3; selectivity for MeOH + DME = 55% (DME selectivity < 1%)

^aTOF (h^–1);

^bSpecific activity toward MeOH formation (mol_MeOH kg_cat^–1 h^–1).