Nucleation of ITQ-21 Studied by ESI-MS

Schaack, Bernd Bastian; Schrader, Wolfgang; Corma, Avelino; Schüth, Ferdi

doi:10.1021/cm901051u

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Nucleation of ITQ-21 Studied by ESI-MS

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Schaack, Bernd Bastian
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schrader, Wolfgang
Service Department Schrader (MS), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth, Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Schaack, B. B., Schrader, W., Corma, A., & Schüth, F. (2009). Nucleation of ITQ-21 Studied by ESI-MS. Chemistry of Materials, 21(19), 4448-4453. doi:10.1021/cm901051u.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-8E7B-6

Abstract

The nucleation pathway of zeolite ITQ-21 was studied by using electrospray ionization mass spectrometry (ESI-MS). The syntheses were performed with different silicon to germanium ratios and with different mineralizing agents. Silicate species with structural characteristics of the obtained material were found to occur already in solution, immediately before nucleation. In addition, by using fluoride (F⁻) or hydroxide ions (OH⁻) as mineralizing agents, it was possible to determine their influence on the nucleation pathway. In particular, a reaction-rate-accelerating rather than a structure-directing effect was determined for F⁻.