Journal
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
Volume 643, Issue 16, Pages 1088-1095Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/zaac.201700141
Keywords
Catalyst promotion; Dry reforming of methane; Lanthanum nickelate; Perovskites; Reduction
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Funding
- Federal Ministry of Education and Research of Germany (BMBF) [FKZ 01RC1006]
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LaNiO3 perovskite is an interesting precursor for Ni/La2O3 catalysts for the dry reforming of methane at high temperatures. Precursors have been synthesized by co-precipitation without, with 2.5 at%, and with 5 at% Ru doping. The presence of Ru leads to a stabilization of the perovskite structure and hinders the decomposition into NiO and Ruddlesden-Popper mixed oxides Lan+1NinO3n+1, which was observed for the Ru-free sample upon calcination at 1000 degrees C (n = 3). Upon reduction in hydrogen, a mechanism involving at least two steps was observed and the first major step was identified as the partial reduction of the precursor leading to a LaNiO2.5-like intermediate. The second major step is the reduction to Ni metal supported on La2O3 independent of the Ru content of the catalyst. In the presence of Ru, indications for Ni-Ru alloy formation and for a higher dispersion of the metallic phase were found. The catalytic activity in DRM of the catalyst containing 2.5% Ru was superior to the catalysts with more or without Ru. Furthermore, the propensity of coke formation was reduced by the presence of Ru.
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