Synthesis of nanostructured fcc/hcp hollow Ni particles by ultrasonic spray pyrolysis and its dry reforming catalytic properties

Nickel Nanoparticles for Liquid Phase Toluene Oxidation – Phenomenon, Opportunities and Challenges

“…[28,30] The different crystalline phases of Ni NPs display significant differences in their physico-chemical properties, enabling their versatile utilisations in many different fields of material science. [31][32][33][34] These differences considering the crystal phases of Ni NPs are largely untested in catalytic liquid phase trans-formations. In sharp contrast, a well-defined structure-activity relationship has been identified in a few examples in gas phases reactions.…”

“…In sharp contrast, a well-defined structure-activity relationship has been identified in a few examples in gas phases reactions. [33] This study focuses on the crystalline phase-activity-selectivity-stability relationships in the catalytic, liquid phase oxidation of the toluene promoted by nickel nanocrystals. The above detailed trends and caveats motivated us to study and determine the role of phase transition/phase purity of nickel nanocrystals as catalysts during the oxidation reaction.…”

“…Moreover, it became evident that direct transformation of fcc Ni NPs into its hcp counterpart can occur over 350 °C because of high stacking‐fault energy (SFE) of fcc Ni NPs (450 mJ m −2 ) [28,30] . The different crystalline phases of Ni NPs display significant differences in their physico‐chemical properties, enabling their versatile utilisations in many different fields of material science [31–34] . These differences considering the crystal phases of Ni NPs are largely untested in catalytic liquid phase transformations.…”

Facile Synthesis of a Library of Hollow Metallic Particles through the Galvanic Replacement of Liquid Gallium

“…First, the synthesis methods are divided into nonsolvent and solution-mediated. − The nonsolvent methods, for instance, include a spray-drying pyrolysis method when a precursor solution is sprayed on the heated surface, followed by the formation of the particles during solvent evaporation . With the following method, hollow Ni nanoparticles can be produced from nickel nitrate precursor and used for CH 4 dry reforming . Solution-mediated methods, in turn, are divided into template (seed-mediated) and template-free (seedless) methods .…”

“…9 With the following method, hollow Ni nanoparticles can be produced from nickel nitrate precursor and used for CH 4 dry reforming. 10 Solutionmediated methods, in turn, are divided into template (seedmediated) and template-free (seedless) methods. 6 The seedmediated technique involves depositing the metals on the surface of a template made up of polymer or silica spheres followed by an etching procedure, aimed to remove the template.…”