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P-Site Structural Diversity and Evolution in a Zeosil Catalyst.

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  • 1Department of Chemistry & Biochemistry, University of California, Santa Barbara, California 93106, United States.

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Phosphorus-modified zeolites (P-zeosils) are key catalysts for biomass conversion. This study reveals diverse phosphorus sites and their structural changes under hydrolysis, crucial for optimizing catalytic activity.

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Area of Science:

  • Materials Science
  • Catalysis
  • Solid-state Chemistry

Background:

  • Phosphorus-modified zeolites (P-zeosils) are effective catalysts for converting biomass derivatives into valuable platform chemicals like p-xylene and 1,3-butadiene.
  • Water generated during catalysis significantly impacts P-zeosil activity, but the precise effects of hydrolysis on active site structure, acidity, and distribution remain poorly understood.

Purpose of the Study:

  • To identify and characterize phosphorus sites (P-sites) in an all-silica self-pillared pentasil (P-SPP) zeolite with low phosphorus loading (Si/P = 27).
  • To investigate the structural and chemical evolution of these P-sites upon exposure to water/humidity.
  • To correlate the observed structural changes with alterations in catalytic acidity.

Main Methods:

  • Solid-state 31P Nuclear Magnetic Resonance (NMR) spectroscopy with frequency-selective detection was employed to identify and distinguish various P-sites.
  • Dynamic Nuclear Polarization (DNP) enhanced the sensitivity for 29Si-filtered 31P detection and 31P-31P correlation experiments.
  • Distinguished between P-O-Si (covalently bound) and P-O-P (oligomeric) linkages, and inferred acidity from calculated Lowest Unoccupied Molecular Orbital (LUMO) energies.

Main Results:

  • A diverse range of P-sites was identified, including surface-bound oligomers, mononuclear, and dinuclear sites with [Si-O-P-O-P-O-Si] motifs in dry P-zeosils.
  • Exposure to humidity rapidly altered the fully-condensed P-sites, even at room temperature.
  • Hydrolysis led to an evolving mixture of P-sites with varying acidities, initially increasing due to P-O-Si cleavage and subsequently decreasing as P-sites converted to phosphoric acid (H3PO4) via P-O-P cleavage.

Conclusions:

  • The study reveals a complex speciation of P-sites in P-zeosils and their dynamic structural and chemical transformations under hydrolytic conditions.
  • Understanding the structure, distribution, and stability of these acidic sites is crucial for controlling the water content and optimizing the performance of P-zeosil catalysts in biomass conversion.
  • The applied NMR techniques provide powerful tools for detailed characterization of active sites in heterogeneous catalysts.