Incorporation of transition metal ions into MeAPO/MeAPSO molecular sieves

Article Abstract:

Electron spin resonance spectroscopy and electron spin-echo modulation spectroscopy are used to investigate the synthetic incorporation of transition meal ion into aluminophosphate and silicoaluminophosphate molecular sieve frameworks.

Research and Development in the Physical, Engineering, and Life Sciences, Chemistry, Analysis, Chemical research, Chemistry, Physical and theoretical, Physical chemistry

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Physicochemical characterization of chromium oxides immobilized in mesoporous MeMCM-41 (Me = Al, Ti, and Zr) molecular sieves

Article Abstract:

Research involving the hydrothermal synthesis of a series of mesoporous siliceous MCM-41 molecular sieves with silicon partially substituted by Ti, Al and Zr is presented. There is a strong interaction between chromium and surface titanium centres.

Chromium, Chromium (Metal)

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Electron spin resonance and electron spin echo modulation studies of ion-exchanged NiH-SAPO-17 and NiH-SAPO-35 molecular sieves: comparison with ion-exchanged NiH-SAPO-34 molecular sieve

Article Abstract:

Solid-state ion-exchange was used to incorporate nickel (Ni) ions into known extraframework sites wherein erionite-like silicoaluminophosphate molecular sieve SAPO-17 and levyne-like SAPO-35 were studied by electron spin resonance and electron spin echo modulation. An investigation was also conducted on Ni ion reducibility, location and interaction with several adsorbates. The results showed that upon dehydration, Ni ions in NiH-SAPO-17 migrated from the erionite supercage to the smaller cancrinite cage.

Nickel, Electron paramagnetic resonance, Electrometallurgy

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