LaMn1−xMgxO3·yMgO catalysts (x=0, 0.2, 0.5, y=2, 6, 17) were prepared, characterised (X-ray diffraction (XRD), BET, scanning electron microscopy (SEM)–energy dispersion spectroscopy (EDS), transmission electron microscopy (TEM), FTIR, chemical analysis and atomic absorption), tested for high-temperature methanecombustion and aged in presence of SO2 to investigate the effect of sulphur on their catalytic activity. Two important roles of MgO have been assessed: (i) MgO acts as promoter for the catalytic activity of fresh LaMn1−xMgxO3·yMgO catalysts up to a certain MgO excess (y=6); (ii) MgO slows down sulphurpoisoning of all LaMn1−xMgxO3·yMgO catalysts. LaMn1−xMgxO3·17MgO catalysts show the highest resistance to sulphurpoisoning and their deactivation is appreciable only after 32 days of exposure to 200 ppmv SO2 at 800°C. They, then, can be regenerated completely by aqueous NH3 washing. Sulphate formation on both perovskite and the MgO phase is proposed to be responsible of catalyst deactivation. An explanation of the nature of these sulphates, also based on FTIR investigation, is given.
Sulphur poisoning of LaMn1-xMgxO3.yMgO catalysts for methane combustion / Rosso, I; Garrone, Edoardo; Geobaldo, Francesco; Onida, Barbara; Saracco, Guido; Specchia, Vito. - In: APPLIED CATALYSIS. B, ENVIRONMENTAL. - ISSN 0926-3373. - 34:1(2001), pp. 29-41. [10.1016/S0926-3373(01)00196-5]
Sulphur poisoning of LaMn1-xMgxO3.yMgO catalysts for methane combustion
GARRONE, EDOARDO;GEOBALDO, FRANCESCO;ONIDA, BARBARA;SARACCO, GUIDO;SPECCHIA, Vito
2001
Abstract
LaMn1−xMgxO3·yMgO catalysts (x=0, 0.2, 0.5, y=2, 6, 17) were prepared, characterised (X-ray diffraction (XRD), BET, scanning electron microscopy (SEM)–energy dispersion spectroscopy (EDS), transmission electron microscopy (TEM), FTIR, chemical analysis and atomic absorption), tested for high-temperature methanecombustion and aged in presence of SO2 to investigate the effect of sulphur on their catalytic activity. Two important roles of MgO have been assessed: (i) MgO acts as promoter for the catalytic activity of fresh LaMn1−xMgxO3·yMgO catalysts up to a certain MgO excess (y=6); (ii) MgO slows down sulphurpoisoning of all LaMn1−xMgxO3·yMgO catalysts. LaMn1−xMgxO3·17MgO catalysts show the highest resistance to sulphurpoisoning and their deactivation is appreciable only after 32 days of exposure to 200 ppmv SO2 at 800°C. They, then, can be regenerated completely by aqueous NH3 washing. Sulphate formation on both perovskite and the MgO phase is proposed to be responsible of catalyst deactivation. An explanation of the nature of these sulphates, also based on FTIR investigation, is given.Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
https://hdl.handle.net/11583/1406143
Attenzione
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo