The properties of various samples as prepared, after reduction and reaction.
| Catalysts | Ni particle size (nm) | Ni particle size (nm) | Dispersione (%) | COL/COBf | Surface M/Ni atomic ratiog | ||
|---|---|---|---|---|---|---|---|
| XRDa | TEMb | XRDc | TEMd | ||||
| 20Ni/SiO2 | 14.3 | 13.5 | 16.8 | 18.6 | 11.7 | 0.73 | — |
| 20Ni/SiO2 (EG) | N.A. | 5.1 | N.A. | 5.4 | 28.3 | 1.32 | — |
| 20Ni–0.5Ru/SiO2 | 12.7 | 10.8 | 13.4 | 12.2 | 13.2 | 1.02 | 0.63 |
| 20Ni–0.5Ru/SiO2 (EG) | N.A. | 4.5 | N.A. | 4.3 | 30.1 | 1.40 | 0.26 |
| 20Ni–0.5Pt/SiO2 | 12.8 | 11.5 | 13.0 | 12.9 | 13.0 | 1.05 | 0.24 |
| 20Ni–0.5Pt/SiO2 (EG) | N.A. | 4.7 | N.A. | 5.5 | 29.5 | 1.37 | 0.18 |
| 20Ni–0.5Pd/SiO2 | 14.0 | 13.1 | 15.0 | 15.8 | 12.1 | 0.94 | 0.18 |
| 20Ni–0.5Pd/SiO2 (EG) | N.A. | 5.9 | N.A. | 6.3 | 25.6 | 1.23 | 0.05 |
a
Ni crystallite size as determined by X-ray diffraction of passivated samples.
b
Ni crystallite size as determined by TEM of passivated samples.
c
Ni crystallite size as determined by X-ray diffraction after CO methanation reaction.
d
Ni crystallite size as determined by TEM after CO methanation reaction.
e
Determined by hydrogen chemisorptions.
f
The ratio of linearly adsorbed CO to bridge adsorbed CO, calculated by CO adsorption peak area in DRIFTS.
g
Determined by XPS, the stoichiometric M/Ni atomic ratio of all catalysts is 0.025.