INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Synthesis and characterization of catalytic PtNaA-PdAu membranes for hydrogen production
Autor/es:
YOHANA MARTÍNEZ GALEANO; LAURA M. CORNAGLIA; AGUSTINA DALLAFONTANA; ANA M. TARDITI
Lugar:
Pittsburgh
Reunión:
Congreso; North American Membrane Society 28th Annual Meeting; 2019
Institución organizadora:
North American Membrane Society
Resumen:
Hydrogen is one of the most promising energy carriers because of being a zero-emission fuel and presents high efficiency. In this actual scenario, Pd-based membranes play an important role in hydrogen production and purification due to their excellent permeability and selectivity. Zeolites have been widely applied in catalysis, due to their small pore size capable of carrying out selective catalysis. We have reported the use of PtNaA zeolite as an efficient catalyst for the water gas shift reaction [1]. Considering that, the aim of this work was to develop catalytic PtNaA-PdAu membranes for hydrogen production, especially in water-gas shift membrane reactors.PdAu alloys were deposited by means of sequential electroless plating, as was previously described [2]. The PtNaA zeolite synthesis was performed on top of the PdAu alloys employing the encapsulated method reported in a previous publication [1]. Different synthesis variables were considered: suface modification with APTES and the number of the hydrothermal synthesis (HS). The samples were characterized by SEM-EDS, XRD, and XPS and evaluated in streams containing H2, CO, and H2O.A compact and homogeneous zeolite coverage was successfully obtained by previous functionalization of the PdAu surface with APTES. XRD diffraction patterns of the PtNaA-zeolite deposited on the PdAu membrane showed the characteristic reflections associated with the NaA zeolite phase. Upon exposure to CO, the membrane showed a reduction in the hydrogen permeance, although the recovery was almost 100% after hydrogen exposure at the same evaluated temperature. Likewise, no nitrogen permeation flux was detected, indicating that the PdAu membrane continues to be H2 selective.Uniform and homogeneous PtNaA-PdAu membranes were obtained employing an optimized synthesis protocol. The membranes showed good stability and resistance to streams with contaminant gases and present themselves as promising materials for hydrogen production.[1] Martínez Galeano, Y., Negri, F., Moreno, M.S., Múnera, J., Cornaglia, L., Tarditi, A.M., Appl. Catal., A 572 (2019) 176-184.[2] Tarditi, A., Gerboni, C., Cornaglia, L., J. Membr. Sci. 428 (2013) 1-10.