Downsizing the K-CHA zeolite by a postmilling-recrystallization method for enhanced base-catalytic performance
| Autor: | Toru Wakihara, Tatsuya Okubo, Sae Okamura, Satoshi Inagaki, Yoshihiro Kubota, Takeshi Kaneda, Taiji Matsumoto, Hiroki Sakurai, Chokkalingam Anand, Kyosuke Sodeyama |
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| Rok vydání: | 2016 |
| Předmět: |
Chabazite
Chemistry Recrystallization (metallurgy) 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences Benzaldehyde Crystallinity chemistry.chemical_compound Chemical engineering Nanocrystal Materials Chemistry Organic chemistry Knoevenagel condensation 0210 nano-technology Zeolite |
| Zdroj: | New Journal of Chemistry. 40:492-496 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/c5nj02052b |
| Popis: | Herein, we report the preparation of potassium chabazite (K-CHA) zeolite nanocrystals with enhanced base-catalytic performance using a bead-milling and postmilling-recrystallization technique. Particles as small as 60 nm were produced by this approach. The surface area of the downsized K-CHA samples showed a significant improvement, increasing from 11 m2 g−1 to 65 m2 g−1. The catalytic activity of the K-CHA nanocrystals in the Knoevenagel condensation of benzaldehyde with ethyl cyanoacetate was found to be twofold higher than that of the raw and the milled samples, achieving 80% product yield within a reaction time of 60 min. In addition, the enhanced catalytic behavior of the K-CHA nanocrystals, despite possessing low surface area relative to the intermediate milled sample, is attributable to the postmilling-recrystallization step, which played a pivotal role in restoring the crystallinity to around 80%. |
| Databáze: | OpenAIRE |
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