Zeolites are a group of minerals made up of aluminum and silicon compounds with unique structures.hy zeolite They are used in industry as catalysts and abrasives, as well as for water and air purification and in pharmaceuticals.hy zeolite They are also marketed as dietary supplements to treat cancer, diarrhea, herpes, and hangover, and to balance pH levels and remove heavy metals from the body.hy zeolite However, there is no clinical evidence to support these claims.
Zeolite Y (faujasite-type) is an effective catalyst for gas-phase glycerol dehydration to acrolein, showing high conversion and catalytic stability under normal conditions.hy zeolite The effect of varying the SiO2/Al2O3 molar ratio on the surface acidity and textural properties of the zeolite was studied by X-ray crystallography, N2 physisorption, SEM-EDXS, FTIR-pyridine, and catalytic testing under hydrocracking conditions.hy zeolite The results showed that the optimum composition of the zeolite was obtained at a SiO2/Al2O3 ration of 3.hy zeolite 5, in which the Mo cluster size was retained after impregnation of hexanuclear molecular halide complex 1 and subsequent H2-treatment. The angstrom-size Mo clusters were highly dispersed on the HY micropores and efficiently supported by the zeolite matrix. Moreover, the chloride ligands were completely removed from the surface by the H2-treatment, as confirmed by elemental analyses.
The hydrated zeolite was found to have an average silica content of 42%, with a mean framework aluminum atom (FAA) of 5.hy zeolite 9
The hydrates were further characterized using 27Al MQ MAS NMR experiments, which showed that the zeolite had five-coordinated and four-coordinated extra-framework aluminum species.hy zeolite The analysis also showed that these aluminum species were distributed as a single site in the pore channels.hy zeolite These results were consistent with those of previous studies on zeolite Y and clinoptilolite, which also contained large amounts of extra-framework aluminium.
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