Abstract
Nanoparticles of zinc oxide‐based materials (ZnO, ZnAl2O4) with various morphologies were synthesized in supercritical water (SCW) with a flow‐type apparatus and in sub‐ and supercritical water with a batch reactor. In the flow‐type apparatus, smaller particles were obtained. Depending on the precursors, the morphology of crystallites is rod, hexagonal, or rectangular shaped. ZnAl2O4 was synthesized with a high specific surface area (SBET) reaching 210 m2/g and nanocrystallite sizes ≤10 nm. The KOH concentration played a major role in the formation of ZnO and ZnAl2O4 phases. Then, the synthesized materials were used as catalysts for the biomass conversion by the oxidation process to produce hydrogen.
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