Electron spin resonance and electron spin-echo modulation evidence for the isomorphous substitution of titanium in titanium aluminophosphate molecular sieves

Article Abstract:

Research was conducted to examine the environment of Ti in the aluminophosphate framework of a series of titanium aluminophosphate molecular sieves with four different structure types including TAPO-5, TAPO-31, TAPO-11 and TAPO-36. Some Ti(IV) ions were reduced to paramagnetic Tii(III) either by gamma-irradiation before ESR analysis at 77 K or by reaction with CO gas. 27al and 31P electron spin-echo modulation of Ti(III) demonstrate titanium substitution into a tetrahedral phosphorus site of the aluminophosphate framework in all four structures.

Usage, Titanium

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Location and adsorbate interactions of vanadium in VAPO-5 molecular sieve studied by electron spin resonance and electron spin echo modulation spectroscopies

Article Abstract:

The location and adsorbate reactions of vanadium in VAPO-5 molecular sieve have been investigated using electron spin resonance and electron spin echo modulation spectroscopic techniques. To this end, VAPO-5 molecular sieve was synthesized hydrothermally using triethylamine as an organic template. Experimental results show that adsorption of deuterated methanol on dehydrated VAPO-5 yields a new vanadium species, VO(CD(sub 3)OH)(sub 2)(super 2+) complex. Other vanadium complexes have been generated from adsorption of different chemicals.

Phosphates, Vanadium, Adsorption, Aluminum compounds

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Electron spin resonance evidence for isomorphous substitution of titanium into titanosilicate TiMCM-41 mesoporous molecular sieve

Article Abstract:

Results of a study that used electron spin resonance spectroscopy on TiMCM-41 molecular sieve offers further confirmation of the isomorphous substitution of Ti(IV) into this material. This research compared synthesized TiMCM-41 material, where Ti is thought to be in a framework tetrahedral site, with Ti ion-exchanged Ti-AlMCM-41 material, where Ti is in an ion-exchangeable extra-framework site. The discoveries made in this study are discussed.

Titanium compounds

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