Table 1.
Preparation of catalyst.
Fig 1.
Experimental system for dry reforming of methane.
Fig 2.
TG of the catalysts (a) Pt/MgO (b) Pt/Mg0.85Ni0.15O(c) Pt/Mg0.97Ni0.03O (d) Pt/Mg0.93Ni0.07O.
Fig 3.
XPS narrow scan of the reduced catalyst.
(a) O1s (b) Pt4f (c) Ni2p (d) Mg2p.
Fig 4.
XRD results of catalysts (a) Pt/MgO(b) Pt/Mg0.97Ni0.0 (c) Pt/Mg0.93Ni0.07O (d) Pt/Mg0.85Ni0.15O.
Table 2.
The main textural properties of fresh catalysts.
Fig 5.
H2-TPR profiles o catalysts (reduced in a 5% H2/Ar stream at a temperature ramp of 10°C/min).
(a) Pt/Mg0.97Ni0.03O (b) Pt/Mg0.93Ni0.07O (c) Pt/Mg0.85Ni0.15O (d) Pt/MgO.
Fig 6.
FT-IR of (a) unreduced and (b) reduced catalysts.
Fig 7.
TEM image of catalysts(a) Pt/MgO(b) Pt/Mg0.97Ni0.03O(c) Pt/Mg0.93Ni0.07O (d) Pt/Mg0.85Ni0.15O.
Fig 8.
FESEM image of catalysts (a) Pt/MgO(b) Pt/Mg0.97Ni0.03O, (c) Pt/Mg0.93Ni0.07O (d) Pt/Mg0.85Ni0.15O.
Fig 9.
Effect of catalyst type on CH4, CO2 and H2/CO conversion with CO2/CH4 = 1:2 at 900°C; (a) Support(MgO); b) Support with promoter (Mg0.85Ni0.15O) and c) Catalyst (Pt/Mg0.85Ni0.15O)
Fig 10.
Effect of CH4/CO2 ratio on the on CH4, CO2 and H2/CO conversion at 900°C; (a) 2:1; b) 1:1.
Fig 11.
Effect of catalyst concentration on H4, CO2 and H2/CO conversion with CO2/CH4 = 1:2, at 900°C; (a) Pt/MgO b) Pt/Mg0.97Ni0.03O c) Pt/Mg0.93Ni0.07O d) Pt/Mg0.85Ni0.15
Fig 12.
Effect of temperature on H4, CO2 and H2/CO conversion for Pt/Mg0.85Ni0.15O catalyst with CO2/CH4 = 1:2; (a) 700°C (b)800°C (c) 900°C
Fig 13.
Stability tests of Pt / Mg0.85Ni0.15O fresh catalysts (a) and recycled catalysts at 900°C for 200 h (GHSV = 15000 ml cat-1h-1, atmospheric pressure).
Fig 14.
TPO curves of a) Mg0.85Ni0.15O b) Pt/Mg0.85Ni0.15O catalysts after 200h reaction with CO2/CH4 = 1:2 at 900°C.
Fig 15.
TEM analysis of (a) Pt/Mg0.85Ni0.15O catalyst; (b) Mg0.85Ni0.15O and respective Pt size distribution after reaction with CO2/CH4 = 1:2 at 900°C.
Fig 16.
DRM reaction of the Pt/Mg0.85Ni0.15O catalyst under 900°C with 1.25% O2.