Surface and bulk investigation of ZSM5 and Al-MCM-41 using synchrotron XPS, XANES, and hexane cracking

P. A. Jalil, M. S. Kariapper, M. Faiz, N. Tabet, N. M. Hamdan, J. Diaz, Z. Hussain

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4 Citations (Scopus)

Abstract

We present a comparative study of ZSM5 and Al-MCM-41 catalysts using spectroscopic and chemical techniques. The analysis of conventional and synchrotron XPS spectra of these catalysts reveals the presence of a topmost surface-related Si peak in addition to the bulk peak. XANES results suggest structural modification upon heating Al-MCM-41 at 500 °C. Depth-resolved XPS data show Al depletion from the surface of Al-MCM-41 in contrast to surface enrichment of Al in ZSM5. These surface modifications could be one of the reasons for the weak acidity of Al-MCM-41 in chemical reactions such as hexane cracking at different temperatures.

Original languageEnglish
Pages (from-to)159-165
Number of pages7
JournalApplied Catalysis A: General
Volume290
Issue number1-2
DOIs
Publication statusPublished - 18 Aug 2005

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Keywords

  • Al-MCM-41
  • XANES
  • ZSM5

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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