ZSM-5 structured catalysts coated with silicalite-1

Godkänd; 2004; 20060922 (bajo)
Alumina beads were coated with ZSM-5 films ranging from 150 nm to 2300 nm ill thickness. The ZSM-5 boated alumina beads were Subsequently hydrothermally treated in a silicalite-1 synthesis solution ill two steps Whereupon a dense silicalite-1 film was formed oil top of the ZSM-5 film. The materials were tested with two probe reactions and the reactivity was compared before and after coating with silicalite-1. As expected, the para-xylene (pX) isomerization reactivity showed no change for samples with and without the top layer of silicalite-1 for equal amounts Of zeolite. Surprisingly, the triisopropylbenzene (TIPB) conversion did not decrease after the silicalite-1 film was introduced. As measured by XPS, the aluminum concentration at the Surface of the uncalcined silicalite-1 film surface was lower compared to that at the Surface of the calcined ZSM-5 film. However, after calcination the concentration of aluminum was higher at the silicalite-1 film surface than at the ZSM-5 film Surface. These results Suggest that aluminum migrates from the ZSM-5 film into the silicalite-1 film during calcination and testing which results in all active top layer.

Hedlund, JonasLuleå tekniska universitet,Industriell miljö- och processteknik(Swepub:ltu)johe (author)
Msimang, V.Catalysis Research Unit, Department of Chemical Engineering, University of Cape Town (author)
Möller, V.Catalysis Research Unit, Department of Chemical Engineering, University of Cape Town (author)
Sterte, Johan (author)
Luleå tekniska universitetIndustriell miljö- och processteknik (creator_code:org_t)

In:Recent advances in the science and technology of zeolites and related materials. Part AAmsterdam : Elsevier, s. 677-6840444518274

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