Characterization of Pt/γ-Al2O3 catalysts deactivated by hexamethyldisiloxane

Arnby, Karl,1974Chalmers tekniska högskola,Chalmers University of Technology (författare)

The deactivation of alumina supported platinum and iron catalysts by hexamethyldisiloxane (HMDS) exposure has been investigated. Three catalysts (Pt/Al2O3, Fe/Al2O3 and Fe/Pt/Al2O3) were prepared and the influence of short- and long-term deactivation on the activity for oxidation of ethyl acetate was studied. The catalysts were characterized using BET, ICP-AES, XPS, SEM and CO chemisorption. The deactivation was found to proceed by deposition of silicon-species in form of silicate (SixOy) that block the active sites on the surface of the catalysts. The silicon seems to rather attach to platinum and iron sites than to the alumina surface. The Pt/Al2O3 catalyst was moderately deactivated by HMDS even though the silicate was blocking almost the entire platinum surface. Adding iron to the catalyst increased the tolerance towards HMDS as fewer Pt sites were blocked for the Fe/Pt/Al2O3 sample. The deactivation of the two platinum containing samples was reversible since the silicate could partly be removed from the Pt sites by regeneration whereby most of the activity was restored. However, for the Fe/Al2O3 sample the deactivation was more severe and irreversible.

Rahmani, MohammadAmirkabir University of Technology (författare)
Sanati, MehriLund University,Lunds universitet,Ergonomi och aerosolteknologi,Institutionen för designvetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Ergonomics and Aerosol Technology,Department of Design Sciences,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)desi-msa (författare)
Cruise, NeilPerstorp Formox (författare)
Amberntsson Carlsson, AnnikaPerstorp Formox (författare)
Skoglundh, Magnus,1965Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)skoglund (författare)
Chalmers tekniska högskolaAmirkabir University of Technology (creator_code:org_t)

Ingår i:Applied Catalysis B: Environmental: Elsevier BV54:1, s. 1-70926-33731873-3883

Av författaren/redakt...: Arnby, Karl, 197 ...; Rahmani, Mohamma ...; Sanati, Mehri; Cruise, Neil; Amberntsson Carl ...; Skoglundh, Magnu ...

Om ämnet

NATURVETENSKAP: NATURVETENSKAP; och Geovetenskap och ...; och Miljövetenskap

TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Produktionstekni ...

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.