Assembly of ε-Keggin Polyoxometalate from Molecular Crystal to Zeolitic Octahedral Metal Oxide

Zeolitic octahedral metal oxides are inorganic crystalline microporous materials with adsorption and redox properties. New E-Keggin nickel molybdate-based zeolitic octahedral metal oxides have been synthesized. P-31 NMR spectroscopy shows that reduction of Mo vi -based molybdates forms an epsilon-Keggin polyoxometalate that immediately transfers to the solid phase. Investigation of the formation process indicates that a low Ni concentration, insoluble reducing agent, and long synthesis time are the critical factors for obtaining the zeolite octahedral metal oxides rather than the epsilon-Keggin polyoxometalate molecule. The synthesized zeolitic nickel molybdate with Na+ is used as the adsorbent, which effectively separates C-2 hydrocarbon mixtures.

Automated summary

Zeolitic octahedral metal oxides are inorganic crystalline microporous materials with adsorption and redox properties. New E-Keggin nickel molybdate-based zeolitic octahedral metal oxides have been synthesized, and the formation process is influenced by the concentration of nickel, the nature of the reducing agent, and the reaction time. The synthesized zeolitic nickel molybdate can be used as an adsorbent to effectively separate C-2 hydrocarbon mixtures.