Gas phase dehydration of glycerol to acrolein over WO 3 -based catalysts prepared by non-hydrolytic sol-gel synthesis.
L NadjiA MassóD DelgadoR IssaadiE Rodriguez-AguadoEnrique Rodríguez CastellónJosé Manuel López NietoPublished in: RSC advances (2018)
Solid acid catalysts based on WO 3 -SiO 2 and WO 3 -ZrO 2 -SiO 2 were prepared by one-pot non-hydrolytic sol-gel method and tested in the gas phase glycerol dehydration to acrolein. Their structural and textural characteristics were determined by X-ray diffraction (XRD), N 2 adsorption, X-ray energy dispersive spectroscopy (XEDS), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). Their acid characteristics were studied by both temperature programmed desorption of ammonia (NH 3 -TPD) and FTIR of adsorbed pyridine. Under our operating conditions, all the catalysts were active and selective in the transformation of glycerol to acrolein, which was always the main reaction product. The high selectivity to acrolein is achieved on catalysts presenting a higher proportion of Brønsted acid sites. In addition, the role of oxygen in the feed on catalytic performance of these catalysts is also discussed.
Keyphrases
- highly efficient
- high resolution
- transition metal
- raman spectroscopy
- metal organic framework
- dual energy
- electron microscopy
- single molecule
- room temperature
- computed tomography
- magnetic resonance imaging
- ionic liquid
- magnetic resonance
- hyaluronic acid
- mass spectrometry
- case report
- solid state
- anaerobic digestion
- gas chromatography