Deactivation mechanisms of iron-exchanged zeolites for NH3-SCR applications
Artikel i vetenskaplig tidskrift, 2015

Emissions of nitrogen oxides (NOX) from internal combustion engines are a major contributor to global air pollution, and with more stringent environmental legislations, the need for more efficient and durable NOX emission control systems increases. In the present paper, experimental results of hydrothermal deactivation and regeneration using hydrogen, and chemical deactivation due to phosphorous and potassium exposure of Fe-BEA as NH3-SCR catalyst are summarized. Based on the experimental results, a multi-site kinetic model is developed to predict deactivation of Fe-BEA. The kinetic model predicts deactivation well by decreasing the number of active sites in the model representing loss of active iron sites due to migration or chemical blockage of the sites. It is discussed that by performing a systematic study of different deactivation mechanisms, a deactivation expression for the active sites could be formulated.

Zeolite

Iron

Mechanisms

Regeneration

Deactivation

NH3-SCR

Författare

Soran Shwan

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Jonas Jansson

Volvo

Louise Olsson

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk reaktionsteknik

Kompetenscentrum katalys (KCK)

Magnus Skoglundh

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Catalysis Today

0920-5861 (ISSN)

Vol. 258 432-440

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Energi

Materialvetenskap

Ämneskategorier

Fysikalisk kemi

Kemiska processer

Kemiteknik

DOI

10.1016/j.cattod.2015.01.003