Effect of activation atmosphere in the Fischer?Tropsch Synthesis using a ??quasi-model? catalyst of c-Fe2O3 nanoparticles supported on SBA-15

SILVANA J. STEWART; JOSÉ F. BENGOA; IGNACIO O PÉREZ DE BERTI; SERGIO G. MARCHETTI; GINA PECCHI; MARÍA V. CAGNOLI

JOURNAL OF CATALYSIS

ACADEMIC PRESS INC ELSEVIER SCIENCE

Lugar: Amsterdam; Año: 2016 vol. 335 p. 36 - 46

0021-9517

The effect of different activation atmospheres (CO:H2 or pure H2) on activity and selectivity of iron nanoparticles supported on SBA-15 in Fischer?Tropsch Synthesis, has been studied. To achieve this aim a new preparation method, using monodisperse pre-synthesized c-Fe2O3 nanoparticles of 3 nm size, supported on SBA-15, was used. These catalysts have structural properties between real and model catalysts. Therefore, they were named ??quasi-model? catalysts. Nanoparticles and catalysts were characterized with several techniques: XRD, N2 adsorption at 77 K, magnetic measurements, electron transmission microscopy, Mössbauer spectroscopy between 298 and 13 K in air and controlledatmosphere and thermal gravimetric analysis. Catalytic tests showed clearly that activation with pure H2 leads to a catalyst more active and less selective to methane than that activated with CO:H2. To explain these results, different reduction steps were proposed. These different sequences would produce a diverse number of active sites.