Effect of thermal ageing on the nature of iron species in Fe-BEA
Artikel i vetenskaplig tidskrift, 2013

The adsorption of NH3 and NO over fresh and thermally treated Fe-BEA catalysts were studied using in situ DRIFT spectroscopy to follow the evolution of different iron species before and after thermal treatment. Fe-BEA samples were prepared and thermally treated in air at 700 °C for 12, 24 and 48 h, and at 800 and 900 °C for 48 h. Compared to the fresh sample, the NH3 adsorption experiments indicate dealumination of the zeolite and iron oxide particle growth for the aged samples. Furthermore, the NO adsorption experiments show distinct absorption peaks which are assigned to isolated iron species, iron clusters and larger iron oxide particles. The thermally treated samples show migration of isolated iron species from the zeolite pores forming iron oxide particles. Further ageing results in a continuous migration and formation of larger iron oxide particles located on the external surface of the zeolite.

Zeolite BEA

Fe3O2

Catalyst deactivation

DRIFT spectroscopy

FTIR

NO

NH3

Författare

Soran Shwan

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Emma Adams

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Jonas Jansson

Volvo

Magnus Skoglundh

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Catalysis Letters

1011-372X (ISSN) 1572-879X (eISSN)

Vol. 143 43-48

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Fysikalisk kemi

Kemiska processer

Materialkemi

Fundament

Grundläggande vetenskaper

DOI

10.1007/s10562-012-0940-z