Abstract

Wavy nickel nanowires (NiNWs) were immobilized on mesoporous silica (SiO₂) aerogels by the sol−gel method. The catalytic activity of pure NiNWs and NiNW−SiO₂ aerogel composites toward the CO₂ hydration reaction (CHR) when they are in water was measured. Dynamic Vapor Sorption (DVS Vacuum) analysis was performed at levels of 50% CO₂ and 50% H₂O vapor for SiO₂ aerogels, immobilized nickel nanoparticles (NiNPs) on silica aerogel and NiNW−SiO₂ aerogel composites, in order to determine catalytic activity for CHR in the gaseous phase. The results from DVS Vacuum analysis (gaseous phase) and CHR (aqueous phase) showed that NiNW−SiO₂ aerogel composites are good heterogeneous catalysts for CHR in both gaseous and aqueous phases but they are less active than NiNP−SiO₂ aerogel composites

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