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Issue 16, 2016
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Hydroisomerization and hydrocracking activity enhancement of a hierarchical ZSM-5 zeolite catalyst via atomic layer deposition of aluminium

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Abstract

Desilication of a ZSM-5 zeolite in basic medium creates intracrystalline mesoporosity advantageous for catalysis, but a decrease in acidity often limits the gain by improved accessibility of sites. Atomic layer deposition of aluminium (Al-ALD) using cycles of reaction and hydrolysis of trimethylaluminum was applied to desilicated ZSM-5 samples to enhance acidity. Framework as well as extra-framework aluminium species were introduced. Removal of extra-framework aluminium via mild acid leaching was beneficial to the acidity. The Al-ALD modified ZSM-5 specimen showed improved dispersion of platinum introduced via impregnation of a Pt(NH3)4Cl2 precursor followed by oxidation and reduction. Hydroisomerization and hydrocracking performance was very sensitive to the ZSM-5 zeolite modification with Al-ALD. The hierarchical sample from which the excess of deposited aluminium was removed showed the best penetration of platinum to the interior and was most active. It outperformed the original ZSM-5 zeolite in activity and hydroisomerization selectivity. Alumina deposited by Al-ALD on the external surface of the ZSM-5 zeolite particles is a preferential location for platinum deposition. Such a catalyst with externally positioned Pt was most selective for hydroisomerization.

Graphical abstract: Hydroisomerization and hydrocracking activity enhancement of a hierarchical ZSM-5 zeolite catalyst via atomic layer deposition of aluminium

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Publication details

The article was received on 08 Apr 2016, accepted on 06 May 2016 and first published on 09 May 2016


Article type: Paper
DOI: 10.1039/C6CY00780E
Citation: Catal. Sci. Technol., 2016,6, 6177-6186
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    Hydroisomerization and hydrocracking activity enhancement of a hierarchical ZSM-5 zeolite catalyst via atomic layer deposition of aluminium

    S. P. Sree, J. Dendooven, P. C. M. M. Magusin, K. Thomas, J. Gilson, F. Taulelle, C. Detavernier and J. A. Martens, Catal. Sci. Technol., 2016, 6, 6177
    DOI: 10.1039/C6CY00780E

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