Modelling the thermal stability of precursor nanoparticles in zeolite synthesis

Miguel Jorge, Scott M. Auerbach, Peter A. Monson

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We have modelled the thermal stability of silica nanoparticles commonly observed as precursors in the synthesis of zeolites. We performed canonical Monte Carlo and parallel tempering simulations on a lattice model that describes the self-assembly of nanoparticles under conditions at which they are observed experimentally. The effect of heating on the relative stability of the phases of the model was analysed by running simulations at various temperatures. At low temperature, the model yields a metastable multi-particle phase with a characteristic size distribution, which is separated by an energy barrier from the true equilibrium phase, a dense silica solid. As temperature increases, the system enters a transition region and eventually reaches the bulk phase. This transition is reminiscent of the experimentally observed transition from nanoparticles to zeolite. The transition temperature scales with the inverse of the system volume, approaching an asymptotic value for large system sizes. This indicates the transition temperature is a reproducible macroscopic property of the system. The transition temperature in the model is within the range of temperatures at which nanoparticles form zeolite crystals in experiments.

LanguageEnglish
Pages3513-3522
Number of pages10
JournalMolecular Physics
Volume104
Issue number22-24
DOIs
Publication statusPublished - 2006

Fingerprint

Zeolites
Nanoparticles
Transition Temperature
Thermodynamic stability
thermal stability
Hot Temperature
nanoparticles
Temperature
transition temperature
synthesis
Silicon Dioxide
silicon dioxide
Temperature scales
temperature scales
tempering
Energy barriers
Tempering
zeolites
Phase equilibria
Heating

Keywords

  • silica nanoparticles
  • zeolites
  • zeolite crystals
  • temperature scales

Cite this

Jorge, Miguel ; Auerbach, Scott M. ; Monson, Peter A. / Modelling the thermal stability of precursor nanoparticles in zeolite synthesis. In: Molecular Physics. 2006 ; Vol. 104, No. 22-24. pp. 3513-3522.
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Modelling the thermal stability of precursor nanoparticles in zeolite synthesis. / Jorge, Miguel; Auerbach, Scott M.; Monson, Peter A.

In: Molecular Physics, Vol. 104, No. 22-24, 2006, p. 3513-3522.

Research output: Contribution to journalArticle

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T1 - Modelling the thermal stability of precursor nanoparticles in zeolite synthesis

AU - Jorge, Miguel

AU - Auerbach, Scott M.

AU - Monson, Peter A.

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AB - We have modelled the thermal stability of silica nanoparticles commonly observed as precursors in the synthesis of zeolites. We performed canonical Monte Carlo and parallel tempering simulations on a lattice model that describes the self-assembly of nanoparticles under conditions at which they are observed experimentally. The effect of heating on the relative stability of the phases of the model was analysed by running simulations at various temperatures. At low temperature, the model yields a metastable multi-particle phase with a characteristic size distribution, which is separated by an energy barrier from the true equilibrium phase, a dense silica solid. As temperature increases, the system enters a transition region and eventually reaches the bulk phase. This transition is reminiscent of the experimentally observed transition from nanoparticles to zeolite. The transition temperature scales with the inverse of the system volume, approaching an asymptotic value for large system sizes. This indicates the transition temperature is a reproducible macroscopic property of the system. The transition temperature in the model is within the range of temperatures at which nanoparticles form zeolite crystals in experiments.

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