Pt encapsulated into NaA zeolite as catalyst for the WGS reaction

MARTÍNEZ GALEANO, YOHANA; NEGRI, FLORENCIA; MORENO, M. SERGIO; MÚNERA, JOHN; CORNAGLIA, LAURA; TARDITI, ANA M.

APPLIED CATALYSIS A-GENERAL

ELSEVIER SCIENCE BV

Año: 2019 vol. 572 p. 176 - 184

0926-860X

Pt catalysts were prepared byencapsulating the active metal in the NaA zeolite structure. The catalysts wereprepared by hydrothermal synthesis usingtwo heating sources, conventional heating through a thermal bath andmicrowave radiation. The synthesis timewas significantly reduced using microwave radiationwithout affectingthe crystallinity or metallic content ofthe solids obtained. By X-ray diffraction thepresence of the pure NaAzeolite phase was confirmed in all the samples. XRD, XPS andTEM results suggested the presence of Pt particlespreferentially located inside thecrystalline structure.Pt_NaA catalysts were active andselective for the water gas shift reaction at 673 K. No methane formation wasdetected in any of the samples under thereaction conditions studied. The Pt_NaA catalyst with low Pt content(0.6% wt.) achieveda high conversion of CO (ca. 70%).