E3S Web Conf.
Volume 266, 2021Topical Issues of Rational Use of Natural Resources 2021
|Number of page(s)||12|
|Section||Technologies of Complex Processing of Mineral Raw Materials|
|Published online||04 June 2021|
Comparison of novel Ni doped exsolution perovskites as methane dry reforming catalysts
1 Technische Universität Wien, Institute of Materials Chemistry, Vienna, Austria
2 Technische Universität Wien, Institute of Chemical Technologies and Analytics, Vienna, Austria
Three perovskite-type materials with a different amount of B-site Ni doping have been tested for their catalytic performance during me-thane dry reforming (MDR) followed by characterization with X-ray dif-fraction (XRD) and scanning electron microscopy (SEM). They could be activated via a reductive treatment (either during a pre-reduction step or di-rectly in reducing reaction atmosphere), the main activating mechanism be-ing the formation of Ni nanoparticles on the surface by exsolution. The catalytic activity increased with the particle size and density. The particle distribution properties could be improved by increasing the amount of Ni doping from 3 % to 10 %, by using an A-site sub-stoichiometric perovskite and by choosing a higher annealing temperature during material prepara-tion. A deactivation over time was observed, due to segregation of CaCO3 on the surface, but no coking or particle sintering occurred
© The Authors, published by EDP Sciences, 2021
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