Improved gel synthesis enables routes to Al-rich chabazite
| Autor: | Grant C. Kester, Charles G. Coe, Chris Bongo, Roger Dean Whitley, William Jack Casteel, Garret Chi-Ho Lau, Anthony Vallace |
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| Rok vydání: | 2021 |
| Předmět: |
Alkaline earth metal
Chabazite Chemistry Nucleation 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Alkali metal 01 natural sciences 0104 chemical sciences Adsorption Chemical engineering Mechanics of Materials Phase (matter) General Materials Science Composition (visual arts) Solubility 0210 nano-technology |
| Zdroj: | Microporous and Mesoporous Materials. 312:110755 |
| ISSN: | 1387-1811 |
| Popis: | Phase pure Al-rich CHA(1.6–2.0) was prepared both from seed-assisted and non-seeded gel routes. Two different gel composition spaces were explored and both cation composition and the addition of seeds had a large effect on the product phase. A working hypothesis that guided the initial synthesis work is that the product phase and SAR is a strong function of the SiO2 solubility for the given gel system and addition of a seed would nucleate a CHA phase. Adsorption studies on pure and mixed alkali/alkaline earth CHA(2.0) showed homogeneous isosteric heats and low N2 Henry's constants for the pure Na and Li forms as well as Ca2Li8CHA(2.0); whereas a heterogenous heat and significant increase in Henry's constant were observed for higher Ca loadings in this mixed Ca/Li system. This behavior strongly suggests that in the dehydrated form |
| Databáze: | OpenAIRE |
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