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Phosphatation of zeolite H-ZSM-5: A combined microscopy and spectroscopy study

Sammendrag

A variety of phosphated zeolite H-ZSM-5 samples are investigated by using a combination of Fourier transfer infrared (FTIR) spectroscopy, single pulse 27Al, 29Si, 31P, 1H-31P cross polarization (CP), 27Al-31P CP, and 27Al 3Q magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, scanning transmission X-ray microscopy (STXM) and N2 physisorption. This approach leads to insights into the physicochemical processes that take place during phosphatation. Direct phosphatation of H-ZSM-5 promotes zeolite aggregation, as phosphorus does not penetrate deep into the zeolite material and is mostly found on and close to the outer surface of the zeolite, acting as a glue. Phosphatation of pre-steamed H-ZSM-5 gives rise to the formation of a crystalline tridymite AlPO4 phase, which is found in the mesopores of dealuminated H-ZSM-5. Framework aluminum species interacting with phosphorus are not affected by hydrothermal treatment. Dealuminated H-ZSM-5, containing AlPO4, retains relatively more framework Al atoms and acid sites during hydrothermal treatment than directly phosphated H-ZSM-5.

Kategori

Vitenskapelig artikkel

Språk

Engelsk

Forfatter(e)

  • HE van der Bij
  • Luis R Aramburo
  • Bjørnar Arstad
  • JJ Dynes
  • J Wang
  • BM Weckhuysen

Institusjon(er)

  • Nederland
  • SINTEF Industri / Prosessteknologi
  • Canada

År

2014

Publisert i

ChemPhysChem

ISSN

1439-4235

Forlag

Wiley-VCH

Årgang

15

Hefte nr.

2

Side(r)

283 - 292

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