Abstract
The development of efficient catalysts with high activities and durabilities for use in the dry reforming of methane (DRM) is desirable but challenging. We report the development of a nanoporous nickel composite (nanoporous Ni/Y2O3) via a facile one-step dealloying technique, for use in the DRM. Focusing on the low-temperature DRM, our composite possessed remarkable activity and durability against coking compared with conventional particle-based Ni catalysts. This was attributed to the aluminum oxides present on the Ni surface, which suppress pore coarsening. In addition, the inert bundled Y2O3 nanowires are suitable for use as substrates for nanoporous Ni.
Highlights
As the major components of natural and greenhouse gases, methane (CH4) and carbon dioxide (CO2) are key to achieving a more sustainable society
We focus on the low-temperature dry reforming of methane (DRM) (450 °C) where carbon coking tends to be significant for Ni catalysts and we wish to demonstrate that our nanoporous Ni composites exhibit structural durability and resistance to coking
The X-ray diffraction (XRD) patterns showed that changes in the crystal structure took place during dealloying, with conversion from the intermetallic Al4NiY precursor to the fcc Ni and Y(OH)[3] compounds being followed by the conversion of Y(OH)[3] to Y2O3 subsequent to the DRM reaction
Summary
As the major components of natural and greenhouse gases, methane (CH4) and carbon dioxide (CO2) are key to achieving a more sustainable society. The dry reforming of methane (DRM) into “syn gas”, which is represented by the transformation CH4 + CO2 → 2H2 + 2CO, could be a potential technological solution; this reaction requires high temperatures (550−1000 °C), which results in significant catalyst degradation due to material sintering and coke deposition.[1−3] To date, many heterogeneous (typically Ni-based) catalysts have been evaluated to determine their stabilities and performances and the modification of interactions between Ni and oxide supports[4−8] and/or the structural design of multicore−shell shaped species[9−22] have been proposed. We focus on the low-temperature DRM (450 °C) where carbon coking tends to be significant for Ni catalysts and we wish to demonstrate that our nanoporous Ni composites exhibit structural durability and resistance to coking. We expect that the nanoporous Ni composites reported will widen the application of nanoporous metals and inspire the design of novel DRM catalysts
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