Lewis–Brønsted induction acidity in SBA-15 modified with Zr and P
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In this work, we present the synthesis of SBA-15 materials modified with 6 and 9 mol.%25 of Zr and P, respectively. Si-lanol SBA-15 groups were detected by Fourier transform infrared spectroscopy. X-ray diffractograms revealed that the typical hexagonal arrangement of SBA-15 was preserved after Zr and P introduction, and the structure was confirmed by transmission electron microscopy. After the Zr introduction, the morphology of SBA-15 changed from fibrous particles to a semi-spherical shape according to scanning electron microscopy, while nitrogen physisorption revealed the stability of the textural materials after the P introduction. The infrared spectra of pyridine adsorption indicated that the Zr and P incorporation into SBA-15 generated adequate Lewis and Brønsted acidities to carry out methanol dehydration and direct the selectivity towards dimethyl ether, with medium-strong acid sites being responsible for obtaining up to 99 %25 selectivity towards dimethyl ether. © Carl Hanser Verlag GmbH %26 Co. KG.
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Dimethyl ether; Methanol; PO43–; SBA-15; ZrO2 Acidity; Ethers; Fourier transform infrared spectroscopy; Fuels; High resolution transmission electron microscopy; Methanol; Scanning electron microscopy; Transmission electron microscopy; Zirconia; Dimethyl ethers; Hexagonal arrangements; Methanol dehydration; Nitrogen physisorption; Pyridine adsorption; SBA-15; X-ray diffractograms; ZrO2; Zirconium
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