Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 15-21 |
| Seitenumfang | 7 |
| Fachzeitschrift | Reaction Kinetics and Catalysis Letters |
| Jahrgang | 69 |
| Ausgabenummer | 1 |
| Publikationsstatus | Veröffentlicht - Jan. 2000 |
Abstract
Investigations on the formation of nitrate enclathrated cancrinite were performed under low temperature hydrothermal conditions (353 K, autogeneous pressure). The alkaline transformation of kaolinite in the presence of sodium nitrate was selected as the preferred method of synthesis. All experiments were carried out at high alkalinity, using a 16 molar NaOH solution as well as at low NaOH concentrations (2 molar NaOH). Qualitative phase analysis was performed by X-ray-powder diffraction and IR-spectroscopy. Besides cancrinite formation no further intermediate phases were formed. Quantitative data of the educt conversion into cancrinite was determined by 27Al MAS NMR spectroscopy and integration of the resonance signals of four- and six-coordinated aluminium. Whereas full conversion could be found already after 24 h of reaction under highly alkaline conditions, only an insufficient progress of the reaction resulted in the case of low alkalinity.
ASJC Scopus Sachgebiete
- Chemische Verfahrenstechnik (insg.)
- Katalyse
- Chemie (insg.)
- Physikalische und Theoretische Chemie
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in: Reaction Kinetics and Catalysis Letters, Jahrgang 69, Nr. 1, 01.2000, S. 15-21.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - The crystallisation kinetics of nitrate cancrinite Na7.6[AlSiO4]6(NO3)1.6 (H2O)2 under low temperature hydrothermal conditions
AU - Buhl, Josef Christian
AU - Taake, Claudia
AU - Stief, F.
AU - Fechtelkord, M.
PY - 2000/1
Y1 - 2000/1
N2 - Investigations on the formation of nitrate enclathrated cancrinite were performed under low temperature hydrothermal conditions (353 K, autogeneous pressure). The alkaline transformation of kaolinite in the presence of sodium nitrate was selected as the preferred method of synthesis. All experiments were carried out at high alkalinity, using a 16 molar NaOH solution as well as at low NaOH concentrations (2 molar NaOH). Qualitative phase analysis was performed by X-ray-powder diffraction and IR-spectroscopy. Besides cancrinite formation no further intermediate phases were formed. Quantitative data of the educt conversion into cancrinite was determined by 27Al MAS NMR spectroscopy and integration of the resonance signals of four- and six-coordinated aluminium. Whereas full conversion could be found already after 24 h of reaction under highly alkaline conditions, only an insufficient progress of the reaction resulted in the case of low alkalinity.
AB - Investigations on the formation of nitrate enclathrated cancrinite were performed under low temperature hydrothermal conditions (353 K, autogeneous pressure). The alkaline transformation of kaolinite in the presence of sodium nitrate was selected as the preferred method of synthesis. All experiments were carried out at high alkalinity, using a 16 molar NaOH solution as well as at low NaOH concentrations (2 molar NaOH). Qualitative phase analysis was performed by X-ray-powder diffraction and IR-spectroscopy. Besides cancrinite formation no further intermediate phases were formed. Quantitative data of the educt conversion into cancrinite was determined by 27Al MAS NMR spectroscopy and integration of the resonance signals of four- and six-coordinated aluminium. Whereas full conversion could be found already after 24 h of reaction under highly alkaline conditions, only an insufficient progress of the reaction resulted in the case of low alkalinity.
KW - Cancrinites
KW - Crystallization kinetics
KW - IR-spectroscopy
KW - MAS NMR
KW - XRD
KW - Zeolites A and X
UR - http://www.scopus.com/inward/record.url?scp=0007601423&partnerID=8YFLogxK
U2 - 10.1023/A:1005676322206
DO - 10.1023/A:1005676322206
M3 - Article
AN - SCOPUS:0007601423
VL - 69
SP - 15
EP - 21
JO - Reaction Kinetics and Catalysis Letters
JF - Reaction Kinetics and Catalysis Letters
SN - 0133-1736
IS - 1
ER -