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Zeolite Beta Format...
Zeolite Beta Formation from Clear Sols : Silicate Speciation, Particle Formation and Crystallization Monitored by Complementary Analysis Methods
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- Castro, Maria (författare)
- Max Planck Institute for Coal Research
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- Haouas, Mohamed (författare)
- Versailles Saint-Quentin-en-Yvelines University
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- Lim, Ivy (författare)
- Max Planck Institute for Coal Research
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- Bongard, Hans J. (författare)
- Max Planck Institute for Coal Research
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- Schüth, Ferdi (författare)
- Max Planck Institute for Coal Research
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- Taulelle, Francis (författare)
- Versailles Saint-Quentin-en-Yvelines University,Catholic University of Leuven
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- Karlsson, Gunnel (författare)
- Lund University,Lunds universitet,Centrum för analys och syntes,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Centre for Analysis and Synthesis,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Alfredsson, Viveka (författare)
- Lund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Breyneart, Eric (författare)
- Catholic University of Leuven
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- Kirschhock, Christine E A (författare)
- Catholic University of Leuven
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- Schmidt, Wolfgang (författare)
- Max Planck Institute for Coal Research
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(creator_code:org_t)
- 2016-09-07
- 2016
- Engelska 13 s.
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Ingår i: Chemistry - A European Journal. - : Wiley. - 0947-6539. ; 22:43, s. 15307-15319
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The formation of silicate nanoaggregates (NAs) at the very early stages of precursor sols and zeolite beta crystallization from silicate nanoparticles (NPs) are investigated in detail using a combination of different analysis methods, including liquid-state 29Si, 27Al, 14N, and 1H NMR spectroscopy, mass spectrometry (MS), small-angle X-ray scattering (SAXS), X-ray diffraction (XRD), and transmission electron microscopy at cryogenic temperatures (cryo-TEM). Prior to hydrothermal treatment, silicate NAs are observed if the Si/OH ratio in the reaction mixture is greater than 1. Condensation of oligomers within the NAs then generates NPs. Aluminum doped into the synthesis mixtures is located exclusively in the NPs, and is found exclusively in a state that is fourfold connected to silicate, favoring their condensation and aggregation. These results are in agreement with general trends observed for other systems. Silicate NAs are essential intermediates for zeolite formation and are generated by the aggregation of hydrated oligomers, aluminate, and templating cations. Subsequent further intra-nanoaggregate silicate condensation results in the formation of NPs. 1H and 14N liquid NMR as well as diffusion ordered spectroscopy (DOSY) experiments provide evidence for weakly restricted rotational and translational mobility of the organic template within NAs as a consequence of specific silicate–template interactions. NAs thus appear as key species in clear sols, and their presence in the precursor sol favors silicate condensation and further crystallization, promoted either by increasing the Si/OH ratio or by heating.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- clear sols
- crystal growth
- mass spectrometry
- nanoparticles
- NMR spectroscopy
- oligomers
- small angle scattering
- transmission electron microscopy
- zeolites
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Castro, Maria
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Haouas, Mohamed
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Lim, Ivy
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Bongard, Hans J.
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Schüth, Ferdi
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Taulelle, Franci ...
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visa fler...
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Karlsson, Gunnel
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Alfredsson, Vive ...
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Breyneart, Eric
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Kirschhock, Chri ...
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Schmidt, Wolfgan ...
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- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
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och Materialkemi
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Chemistry - A Eu ...
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Lunds universitet