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- W2014433744 abstract "Abstract An experimental design was applied to the hydrothermal synthesis of VAPO-11 molecular sieve (AEL structure) from a VOSO4·5H2O·Al(iPrO)3·Pr2NH·H2O gel. The influence of five synthesis parameters (synthesis temperature, synthesis time, vanadium content, water content and template content) on the crystallinity and physicochemical properties of the as-synthesized materials was studied. The obtained materials were characterized by electron spin resonance (ESR), diffuse reflectance spectroscopy (DRS), X-ray diffraction, thermal analysis measurements, scanning electron microscopy and in situ Fourier transform infrared (FTIR) spectroscopy. The AEL structure appears either as a single phase or as a physical mixture together with the AFO structure (VAPO-41). A statistical model is proposed, which relates the synthesis variables with the crystallinity allowing to indicate the optimal synthesis conditions for VAPO-11. Highly crystalline single-phase VAPO-11 can be best prepared at 170°C from a synthesis gel with a low vanadium content (0.02 mol) and a high water content (25 mol). The co-ordination of vanadium in these materials is discussed on the basis of the ESR and DRS spectra. The spectroscopic data are explained by the presence of a vanadium species in distorted octahedral co-ordination, composed of two V–O–T bonds with the framework, one bond with the vanadyl oxygen and three water molecules as ligands." @default.
- W2014433744 created "2016-06-24" @default.
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- W2014433744 date "2000-10-01" @default.
- W2014433744 modified "2023-10-18" @default.
- W2014433744 title "On the synthesis of vanadium containing molecular sieves by experimental design from a VOSO4·5H2O·Al(iPrO)3·Pr2NH·H2O gel: occurrence of VAPO-41 as a secondary structure in the synthesis of VAPO-11" @default.
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- W2014433744 doi "https://doi.org/10.1016/s1387-1811(00)00225-0" @default.
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