Table 2. Catalytic performance for various catalysts.

Catalyst	S BET (m2 g–1)	r a (μmol g–1 h–1)		TOF b (s–1)		E a (kJ mol–1)	Ref.
		340 °C	400 °C	340 °C	400 °C
LaRuSi before EDTA	1.4	840	1810	0.028	0.060	40	This work
LaRuSi after EDTA	4.2	3020	5340	0.033	0.059	48	This work
CeRuSi before EDTA	1.6	770	1680	0.022	0.047	47	This work
CeRuSi after EDTA	4.0	2650	5480	0.030	0.062	52	This work
PrRuSi before EDTA	1.5	560	1180	0.017	0.035	45	This work
PrRuSi after EDTA	2.0	1010	2370	0.023	0.053	52	This work
NdRuSi before EDTA	1.5	280	670	0.008	0.020	51	This work
NdRuSi after EDTA	2.2	1230	3000	0.025	0.061	55	This work
Ru (1.2 wt%)/C12A7:e– c	1–2	1160	2760	0.083	0.197	49	9
Ru (1.8 wt%)/C12A7:e–	1.0	2020		0.068		51	14
Cs–Ru (1.0 wt%)/MgO c	12		2260		0.013	86	9
Cs–Ru (2.0 wt%)/MgO	12	3200		0.009		120	14
Ru	3.1		23		0.00009		This work
Ru d	3.1		12		0.00005		26
YRu2 c	0.7		490		0.014	73	26
YRu2	6.4		3320		0.011		26
Co3Mo3N	8.5		800		0.0012	57	21
LaCoSi	1.8		1250		0.031	42	21
Fe–K2O–Al2O3 e	14		330			56	31

^aOperation condition: 0.1 g of catalyst at 0.1 MPa with H₂/N₂ = 45/15 mL min^–1 flow. The ammonia formation rates were measured after holding at 400 °C for 24 h.

^bCO is not easily adsorbed on the bulk catalysts; therefore, the estimation was conducted using the surface area (S_BET) and the covalent radii of active atoms, and the Wigner–Seitz radii as the averaged radii for the bulk compounds.

^c0.2 g of catalyst.

^d0.5 g of catalyst.

^e0.4 g of catalyst.