Synthesis, characterization, and catalytic performance of high-silica Y zeolites with different crystallite size
| Autor: | Huihua Pan, Lingjiang Kong, Zhongqing Liu, Minggang Li, Yuansheng Zhao, Li Wenle, Yusheng Zhao, Mingyuan He, Liu Yuandong |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Sodium aluminate Mineralogy General Chemistry Condensed Matter Physics Fluid catalytic cracking Catalysis law.invention chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials law General Materials Science Particle size Crystallite Crystallization Hydrate Zeolite |
| Zdroj: | Microporous and Mesoporous Materials. 167:102-108 |
| ISSN: | 1387-1811 |
| Popis: | High-silica NaY (SiO 2 /Al 2 O 3 > 6.0) was synthesized without organic template in a novel, cheap, and relatively fast way by using as structure directing agent (SDA) a mixture of water glass, sodium aluminate, and sodium hydrate, which had been aged at low temperature. Liquid 27 Al NMR characterization showed that the SDA nuclei aged at low temperature contained more silicon and were more stable than SDA prepared with the conventional method, thus inducing the formation of high-silica NaY during crystallization, as determined by XRD, XRF, and 29 Si NMR. Particle size had a great effect on the structural stability of zeolite Y and catalytic cracking ability even at a high SiO 2 /Al 2 O 3 ratio. In the cracking of vacuum gas oil, REY catalysts, made from high-silica NaY with crystallite size 300–500 nm, not only had higher cracking activity, but also higher gasoline and diesel yield and lower coke yield than a conventionally prepared sample. On the other hand, REY catalysts with crystallite size between 100 and 300 nm had a lower activity. |
| Databáze: | OpenAIRE |
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