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- W2034376943 abstract "Abstract Microwave (MW) irradiation was used to synthesize aluminum-pillared clays (MW-Al-PILCs) by replacing the conventional calcination of Al-PILCs precursors (pre-Al-PILCs). X-ray diffraction (XRD) patterns and nitrogen adsorption/desorption isotherms showed that the MW-irradiated pre-Al-PILCs gave a series of MW-Al-PILC materials exhibiting some characteristics comparable to Al-PILCs obtained by conventional heating. However, differential thermal analysis (DTA), thermogravimetric analysis (TGA), impedance spectroscopy, 27 Al MAS NMR, and intercalative adsorption of methylene blue (MB), indicated that the MW-Al-PILC samples were intermediate between Al-pre-PILCs and conventional Al-PILCs. The 27 Al MAS NMR spectra showed that in MW-Al-PILCs obtained after 18 min of MW irradiation, the Al IV /Al VI ratio was 1/9, which is comparable to that in Al-pre-PILCs (8% Al IV ; 92% Al VI ) and significantly different from the typical values of conventional Al-PILCs (23% Al IV ; 77% Al VI ). It is assumed that the MW-induced calcination gives PILCs containing a fraction of residual, hydroxylated Al-polycations. The good thermal stability of the MW-Al-PILCs supports their possible use as acid catalysts." @default.
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- W2034376943 date "1999-03-01" @default.
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- W2034376943 title "Synthesis of pillared clays assisted by microwaves" @default.
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- W2034376943 doi "https://doi.org/10.1016/s0025-5408(99)00053-7" @default.
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