Studies on the use of faujasite as a reagent to deliver silica and alumina in building new zeolite structures with organo-cations
| Autor: | Christopher M. Lew, Dan Xie, Joel E. Schmidt, Stacey I. Zones, Robert J. Saxton, Tracy M. Davis |
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| Rok vydání: | 2020 |
| Předmět: |
Silylation
Chemistry Nucleation 02 engineering and technology General Chemistry Faujasite engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Reaction rate Chemical kinetics Chemical engineering Mechanics of Materials Reagent engineering General Materials Science 0210 nano-technology Selectivity Zeolite |
| Zdroj: | Microporous and Mesoporous Materials. 300:110162 |
| ISSN: | 1387-1811 |
| Popis: | The use of zeolites, in particular faujasite (FAU), as synthesis reagents to make other zeolite types has steadily increased in the past several years. In this contribution, we survey some of these research programs and review Chevron's long history in this area. By using more open (lower framework density) zeolites as reagents in combination with organic SDAs, we discovered early on that this synthesis route provided a means to change the reaction kinetics and therefore reaction times while also influencing product selectivity. Critical to our understanding of this synthetic method was determining if ion-exchange into an open structure like FAU could lower activation barriers to nucleation. To answer this question, we studied the conversion of FAU into SSZ-13 (CHA) with variable acidity, a system in which we have significant experience and synthetic data for comparison. Here, we specifically considered the ion-exchange events themselves and the zeolite reaction rates. In addition, we altered some of the synthesis events by silylation of the FAU reagents. |
| Databáze: | OpenAIRE |
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