Preparation of Mn, Fe and Co based perovskite catalysts using microemulsions
Artikel i vetenskaplig tidskrift, 2004

Mixed metal oxides with perovskite structure were prepared using microemulsions. The perovskite materials had the nominal composition La0.8Sr0.2M1-xRhxO3 (where M = Mn, Co, Fe and x = 0, 0.1). X-ray diffraction analysis showed that the perovskite phase was generally obtained at relatively low temperatures, ≤700C. When the calcination temperature was kept low, the surface areas were relatively high and the highest surface area (25m2/g) was observed for La0.8Sr0.2Mn0.9Rh0.1O3 after calcination at 500C. Microstructural analysis using TEM and SEM showed particles in the size range of microns consisting of smaller crystallites in the range of 30–50 nm. The materials were tested as catalysts for the selective reduction of NOx with NH3 (NH3-SCR) and the activity varied between samples with different transition metal. However, potassium, which originated from the technical surfactant used in the microemulsion, was detected by XRF analysis in various amounts in the samples and it was therefore not possible to conclude if the differences in catalytic performance were due to the different transition metals or to the potassium in the samples. Characterisation showed that it was possible to incorporate rhodium in the perovskite materials, which generally resulted in enhanced catalytic activities for the reduction of NOx with NH3.

Perovskite

SCR

NOx reduction

NH3

microemulsion

Författare

Mikaela Wallin

Chalmers, Institutionen för material- och ytkemi, Teknisk ytkemi

Kompetenscentrum katalys (KCK)

Neil Cruise

Chalmers University of Technology

Perstorp AB

Uta Klement

Chalmers, Institutionen för materialteknik

Anders Palmqvist

Kompetenscentrum katalys (KCK)

Chalmers, Institutionen för material- och ytkemi, Teknisk ytkemi

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Chalmers, Institutionen för material- och ytkemi, Teknisk ytkemi

Colloids and Surfaces A: Physicochemical and Engineering Aspects

0927-7757 (ISSN)

Vol. 238 27-35

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Materialteknik

Kemiteknik

Kemi

DOI

10.1016/j.colsurfa.2004.02.019