Influence of ammonia on CO and methanol oxidation over Pt/γ-Al2O3 catalysts modified by Mg
Artikel i vetenskaplig tidskrift, 2004

We have studied the effect of modifying Pt/γ-Al2O3 catalysts with magnesium on the oxidation of methanol and carbon monoxide in presence of ammonia. The purpose for adding magnesium to the catalysts was to enhance the low-temperature activity and to make catalysts more resistant towards ammonia inhibition. The catalysts were prepared by wet-impregnation using platinum nitrate and magnesium nitrate solutions. The platinum content was constant for all catalysts, while the magnesium content ranged from 0 to 5 wt.%. The catalysts were characterized by CO chemisorption, AAS, XRD, XPS and BET. The addition of magnesium resulted in the formation of both MgAl2O4 spinel and MgO, and did slightly improve the low-temperature activity for carbon monoxide oxidation, while the activity for methanol oxidation decreased compared to an unpromoted Pt/γ-Al2O3 catalyst. The inhibition by ammonia for carbon monoxide oxidation was low for all catalysts, while the methanol oxidation was substantially inhibited by ammonia. Adding magnesium to Pt/γ-Al2O3 catalysts did not make the catalysts more resistant to ammonia inhibition.

CO oxidation

Poisoning

Low-temperature

Methanol oxidation

Alumina

Magnesium

Platinum

NH3 inhibition

Catalytic activity

Författare

Karl Arnby

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

A. Torncrona

Perstorp Formox

Eka Chemicals AB

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Chalmers, Kemi- och bioteknik, Teknisk ytkemi

Applied Catalysis B: Environmental

0926-3373 (ISSN) 1873-3883 (eISSN)

Vol. 49 51-59

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Kemiteknik

Miljövetenskap

DOI

10.1016/j.apcatb.2003.11.016