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Adsorption

, Volume 11, Issue 5–6, pp 577–580 | Cite as

Surface P and Al Distribution in P-modified ZSM-5 Zeolites

  • Mauri José Baldini Cardoso
  • Danielle De Oliveira RosasEmail author
  • Lam Yiu Lau
Article

Abstract

The surface composition of two commercial ZSM-5 zeolites with and without PO4 modification was examined by X-ray photoelectron spectroscopy. Both zeolites were slightly enriched in aluminum on the surface. The surface silica/alumina ratio (SAR) was about half of that of the bulk. Calcination at 600C decreased slightly this enrichment. After drying with H3PO4 followed by calcination, both zeolites showed surface enrichment of PO4. The surface of the zeolite with large crystal was more enriched. Steaming resulted in enrichment of aluminum on the surface, in agreement with migration of extra-framework alumina. Increasing phosphate content decreased this enrichment.

Keywords

synthesis techniques characterization of structure properties measurement methods 

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • Mauri José Baldini Cardoso
    • 1
  • Danielle De Oliveira Rosas
    • 1
    Email author
  • Lam Yiu Lau
    • 1
  1. 1.Petrobras, Centro de Pesquisas e DesenvolvimentoIlha do FundãoRio de JaneiroBrasil

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