Comparative ESR studies on the reducibility and adsorbate interactions of paramagnetic Ni(I) in synthetic ferrierite and mordenite

Article Abstract:

Comparative electron spin resonance (ESR) spectroscopy studies were used for examining the formation of monovalent nickel in NiNaK-ferrierite, its interaction with several adsorbates between NiNak-ferrierite and in NiNak-mordenite, reducibility of Ni(II) and the location of Ni(I). The reducibility of Ni(II) in NiNaK-ferrierite is higher than the reducibility observed in NiNaK-mordenite, when it is subjected to thermal and hydrogen reduction, which can be attributed to lesser negative charge of the ferrierite framework.

Thermal properties, Chemistry, Physical and theoretical, Physical chemistry

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Electron spin resonance and electron spin echo modulation studies on the formation and adsorbate interactions of Ni(I) in synthetic clinoptilolite

Article Abstract:

Research was conducted to examine the formation of Ni(I) by several reduction methods and various adsorbate interactions of Ni(I) in synthetic clinoptilolite using electron spin resonance and electron spin echo modulation spectroscopies. The incorporation of Ni(II) was obtained by ion exchange into extraframework sites. The adsorption of NO on dehydrated Ni(II)NaK-Clino yields two Ni(I)-NO+ complexes that are indicated to be located near M2 sites within the clioptilolite structure.

Nitrogen (Chemical element), Ion exchange, Nitrogen

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Catalytic study of ethylene dimerization on Ni(II)-exchanged clinoptilolite

Article Abstract:

An investigation of the catalytic activity and selectivity for the ethylene dimerization on Ni(II)-exchanged clinoptilolite using a static reactor and gas chromatography is presented. Adsorption of ethylene on reduced Ni(I) -clinoptilolite at 298 K leads to the formation of Ni(0) clusters without forming any Ni(I) complexes with ethylene or butene.

Cyclic Crude and Intermediate Manufacturing, Ethylene, Butylenes, Butylene

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