Acidity adjustment of HZSM-5 zeolites by dealumination and realumination with steaming and citric acid treatments

Article Abstract:

A method for acidity adjustment of HZSM-5 zeolites with steaming and citric acid treatments, is described and the realumination effects of citric acid on HZSM-5 zeolites dealuminated by steaming is studied. The realumination effect of the citric acid treatment on the streamed HZSM-5 zeolite, can nearly recover the pore structure of the steamed zeolite to that of parent HZSM-5 zeolite and appropriately tailor the amount and strength of different acid sites.

Zeolites, Citric Acid, Structure, Chemical properties

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Characterization of covalent linkages in organically functionalized MCM-41 mesoporous materials by solid-state NMR and theoretical calculations

Article Abstract:

Solid-state nuclear magnetic resonance spectroscopy (NMR) and density functional theory (DFT) calculations are used to investigate the covalent linkages formed in organically functionalized MCM-41mesoporous silica materials. The results have shown that state-of-art spectroscopic and theoretical methods can be used together to refine the complex structures of inorganic-organic hybrid materials.

Molecular Sieves, Industrial sand, Silica & Silica Sand, Industrial Sand Mining, Silicon Dioxide, Analysis, Silica, Nuclear magnetic resonance spectroscopy, Spectra, Density functionals, Density functional theory, Mechanical properties

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