Density functional theory calculation and X-ray absorption spectroscopy studies of structure of vanadium-containing aluminophosphate VAPO-5

Article Abstract:

New research uses density functional B3LYP correlation-exchange to investigate the structure of the vanadium-containing aluminophosphate-5 molecular sieve VAPO-5.

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Controlled reduction of the acid site density of SAPO-34 molecular sieve by means of silanation and disilanation

Article Abstract:

The silanation and disilanation of a TEAOH-templated SAPO-34 was investigated and the physical and chemical properties of these modified catalysts were compared with the parent sample. The spectroscopic data show a gradual decrease in the Bronsted acid site density with increasing SiH4 or Si2H6 modification degrees.

Science & research, All Other Basic Organic Chemical Manufacturing, All Other Basic Inorganic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, All Other Miscellaneous Chemical Product and Preparation Manufacturing, Catalysts, Chemical preparations, not elsewhere classified, Molecular Sieves, Silicon & Inorganic Compounds, Silicon compounds, Atomic properties

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Synthesis and characterization of vanadium-substituted mesoporous molecular sieves

Article Abstract:

A series of vanadium-substituted mesoporous molecular sieves of the MCM-41 type has been synthesized and characterized using ultraviolet Raman, ultraviolet-visible, (super 51)V solid-state nuclear magnetic resonance and X-ray absorption spectroscopies. The synthetic approach involves systematically changing the pore size and metal loading and elucidating the local structure of incorporated vanadium. Results show that the vanadium is incorporated into the framework of hydrated and dehydrated samples, mostly occupying isolated tetrahedral sites.

Transition metals, Oxidation-reduction reaction, Oxidation-reduction reactions

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