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MWW-type catalysts for gas phase glycerol dehydration to acrolein

2015; Elsevier BV; Volume: 334; Linguagem: Inglês

10.1016/j.jcat.2015.11.010

1090-2694

Camila Santana Carriço, Fernanda T. Cruz, Maurício B. dos Santos, Daniel Souza de Oliveira, Heloise O. Pastore, Heloysa Martins Carvalho Andrade, Artur J.S. Mascarenhas,

Mesoporous Materials and Catalysis

The materials derived from MWW layered precursor (MCM-22, MCM-36 and ITQ-2) were synthesized with molar ratio SiO2/Al2O3 = 30, characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetry (TG), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), textural analysis by N2 physisorption, temperature programmed desorption of ammonia (NH3-TPD) and diffuse reflectance infrared spectroscopy (DRIFTS) of adsorbed pyridine and evaluated in gas phase glycerol dehydration to acrolein. The delaminated material (ITQ-2) has presented better catalytic performance than MCM-22 zeolite or MCM-36 pillared material, in both glycerol conversion and acrolein selectivity. These results were interpreted based on the textural properties and acidity changes. ITQ-2 excellent performance is due to higher accessibility and improved acidity when compared to pillared MCM-36 or parent MCM-22 zeolite. Long-term stability under either nitrogen or air co-feeding was investigated for ITQ-2.