Abstract
Three different alumina-based Ni, Cu, Co oxide catalysts with metal loading of 10 wt %, and labeled 10Ni–Al, 10Co–Al and 10Cu–Al, were prepared by microwave-assisted solution combustion. Their morphological, structural and surface properties were deeply investigated by complementary physico-chemical techniques. Finally, the three materials were tested in CO oxidation used as test reaction for comparing their catalytic performance. The 10Cu–Al catalyst was constituted of copper oxide phase, while the 10Ni–Al and 10Co–Al catalysts showed the presence of “spinels” phases on the surface. The well-crystallized copper oxide phase in the 10Cu–Al catalyst, obtained by microwave synthesis, allowed for obtaining very high catalytic activity. With a CO conversion of 100% at 225 °C, the copper containing catalyst showed a much higher activity than that usually measured for catalytic materials of similar composition, thus representing a promising alternative for oxidation processes.
Highlights
Different synthetic methods, such as co-precipitation, impregnation, sol-gel and homogeneous deposition precipitation have been widely used for catalytic materials preparation
Alumina-based Ni, Cu, Co-oxide catalysts prepared through microwave-assisted solution combustion were fully characterized and tested in CO oxidation
10Ni–Al and 10Co–Alcatalysts, Ni and Co were mainly present as metal-aluminate surface spinels that are very low active species in CO oxidation
Summary
Different synthetic methods, such as co-precipitation, impregnation, sol-gel and homogeneous deposition precipitation have been widely used for catalytic materials preparation. These methods generally require numerous synthetic steps, specific equipment and energy intensive protocols, which pushed researchers to look for alternative methods. The properties of the materials obtained by solution combustion strongly depend on the processing parameters and can be tuned by varying the combustion conditions. The success of this process is closely linked to the choice of the redox mixture and the most suitable precursors. Metal nitrates are chosen as metal precursors due to their high water solubility, Materials 2019, 12, 910; doi:10.3390/ma12060910 www.mdpi.com/journal/materials
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