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2 2008

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CO Transformation on Gold Catalysts – a Comparison with the Reaction on Pt/NbMCM-41

Klimas W., Sobczak I., Marie O., Bazin P., Daturi M., Ziolek M.

Polish Journal of Chemistry

2008

Vol. 82, nr 9

1695-1695

Silicate and niobosilicate MCM-41 were used as su ports for gold introduced by post synthesis impregnation or by co-precipitation during the synthesis. The latter sample (AuMCM-41) exhibited unique properties for the WGS reaction, as revealed by in situ FTIR and FTIR/MS OPERANDO techniques. AuMCM-41 is activated by CO through the formation of oxygen vacancies in volved in oxygen adsorption and activation for the further reaction. This behaviour is not characteristic for Pt/MCM-41 catalysts and appears only after the introduction of niobium into the mesoporous matrix (Pt/NbMCM-41).

Nanosorbents for selective removal of odours

Ziolek M., Sobczak I., Dudzik A., Konwicki Ł., Kujawa J.

Materials Science Poland

2008

Vol. 26, No. 2

425--431

Y type zeolites modified with Cu, Ni, Mn as well as mesoporous hexagonally ordered silicates and niobosilicates of MCM-41 type with gold dispersed as an active component were studied in odour adsorption. Dibutyl sulfide and butyl amine were used as odour components and they were adsorbed separately and in the presence of high moisture content. The attractiveness of Au/MCM-41 samples for the selective adsorption of both odour compounds (much higher for the sulfide) and their possible further oxidation during the recovery of sorbents has been proved. The highest resistance for moisture adsorption was found for Au/NbMCM-41.