An MAS NMR study on the Mo-modified phosphoric rare earth (HZRP-1) penta-sil zeolite catalyst

Article Abstract:

An attempt was made to characterize in-situ an Mo modified phosphoric rare earth-containing penta-sil zeolite catalyst using high-resolution solid-state MAS NMR, equipped with a newly designed device for conducting catalytic reactions. It shows good activity for methane dehydro-aromatization in the absence of oxygen.

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Study on the external surface acidity of MCM-22 zeolite: theoretical calculation and (super 31)P MAS NMR

Article Abstract:

In the present work, the external surface acidity of MCM-22 zeolite was characterized by triphenylphosphine (PPh3) adsorption followed by a (super 31) P MAS NMR spectrum. Molecular mechanical simulations revealed that the probe molecules were too large to completely enter into the 12-MR pocket of the MCM-22 zeolite.

Industrial Gas Manufacturing, Industrial gases, Phosphine, Nuclear magnetic resonance spectroscopy, Mechanical properties

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M0/HMCM-22 catalysts for methane dehydroaromatization: a multinuclear MAS NMR study

Article Abstract:

A multinuclear MAS NMR study was conducted for examining the fresh and coked Mo/HMCM-22 catalysts for methane dehydroaromatization. Results suggest that the bad catalytic performance could be attributed to the destruction of the zeolite lattice.

Observations, Spectra, Optical properties

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