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Bi-reforming of met...
Abstract
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- A Ni-based pyrochlore catalyst was synthesized using the modified Pechini method. In this method, 1 wt% Ni was doped into the La2Zr2O7 pyrochlore structure. The catalyst was characterized by H2-TPR, TPO, XRD, and EXAFS, and tested for its methane reforming activity under bi-reforming reaction conditions; i.e.; in the presence of CO2 and steam: 3CH4+CO2+2H2O⇌4CO+8H2 Repeated TPR/TPO cycles showed that the two consecutive TPR spectra do not change, showing that the catalyst is stable at high temperatures, and that the nickel oxidation/reduction process is reversible. The catalyst showed constant activity with time at all temperatures in the range of 700-950 °C over a cumulative period of 170 h. After this series of bi-reforming tests, TPO of the spent catalyst was carried out, which showed detectable but unquantifiable carbon deposition. The presence of steam in bi-reforming greatly limits carbon deposition compared to directly related dry-reforming tests on this same catalyst.
Subject headings
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Keyword
- Bi-reforming
- Dry-reforming
- Methane activation
- Pyrochlore
- Reforming
- Syngas
- Carbon dioxide
- Catalyst activity
- Catalysts
- Deposition
- Methane
- Nickel
- Reforming reactions
- Dry reforming
- Modified Pechini method
- Pyrochlore structures
- Pyrochlores
- Reaction conditions
- Reforming of methane
- Syn-gas
- Steam reforming
Publication and Content Type
- ref (subject category)
- art (subject category)
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