ZSM-5 structured catalysts coated with silicalite-1

Öhrman, Olov (författare)

Hedlund, Jonas (författare): Luleå tekniska universitet,Industriell miljö- och processteknik

Msimang, V. (författare): Catalysis Research Unit, Department of Chemical Engineering, University of Cape Town

Möller, V. (författare): Catalysis Research Unit, Department of Chemical Engineering, University of Cape Town

Sterte, Johan (författare)

(creator_code:org_t)

Amsterdam : Elsevier, 2004
2004
Engelska.
Ingår i: Recent advances in the science and technology of zeolites and related materials. Part A. - Amsterdam : Elsevier. - 0444518274 ; , s. 677-684

Abstract Ämnesord

Stäng

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.

Om ämnet

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