Mechanism of sulfidation of small zinc oxide nanoparticles

摘要: ZnO has industrial utility as a solid sorbent for the removal of polluting sulfur compounds from petroleum-based fuels. Small nanoparticles may be more effective in terms sorption capacity and ease sulfidation compared to bulk ZnO. Motivated by this promise, here, we study NPs uncover solid-state mechanism process crystallographic optical absorbance characterization. The wurtzite-structure undergo complete yield ZnS with drastically different zincblende structure. However, early stages, NP lattice undergoes only substitutional doping sulfur, while retaining its wurtzite Above threshold sulfur-doping level 30 mol%, separate grains nucleate, which grow at expense NPs, finally yielding NPs. Thus, full oxide sulfide transformation cannot viewed simply topotactic place-exchange anions. product formed nucleation-growth share neither structure nor size initial reaction inform future design nanostructured sorbents.