Zinc-Modified ZSM-5 Nanozeolites Synthesized by the Seed-Induced Method: Interrelation of Their Textural, Acidic, and Catalytic Properties in DME Conversion to Hydrocarbons
| Autor: | Z. M. Bukina, N. V. Kolesnichenko, Wei Wu, S. A. Kurumov, Yu. M. Snatenkova, S. N. Khadzhiev, Xiaofang Su, Ke Zhang |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Ion exchange 010405 organic chemistry General Chemical Engineering Energy Engineering and Power Technology chemistry.chemical_element General Chemistry Zinc 010402 general chemistry 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Fuel Technology Hydrocarbon chemistry Geochemistry and Petrology Methanol ZSM-5 Zeolite Selectivity Nuclear chemistry |
| Zdroj: | Petroleum Chemistry. 57:1036-1042 |
| ISSN: | 1555-6239 0965-5441 |
| Popis: | The effect of the method of introduction of zinc cations and the zinc content in a nanocrystalline zeolite of the ZSM-5 type on the physicochemical and catalytic properties of the material in DME conversion to a mixture of liquid synthetic hydrocarbons has been studied. Zinc is introduced into the catalysts both during the zeolite synthesis and the ion exchange (Zn n Al m NZ5 and ZnNZ5, respectively). The use of nanocrystalline Zn n Al m NZ5 zeolites provides the formation of a mixture of liquid hydrocarbons with a high selectivity of no less than 90%; the liquid hydrocarbons contain more than 70% of isoparaffins and a small amount of aromatic compounds. An increase in the zinc loading of the Zn n Al m NZ5 zeolite from 0.9 to ~3% leads to an increase in the methanol content in the aqueous phase of the liquid product, an increase in the selectivity for liquid hydrocarbons, and a slight increase in the concentration of aromatic and unsaturated hydrocarbons in the mixture. In the presence of the ZnNZ5/Al2O3 catalyst with Zn introduced by ion exchange, the methanol content in the aqueous phase and the aromatics content in the liquid hydrocarbon mixture are significantly higher. The Zn n Al m NZ5 nanozeolites are characterized by a more developed external surface, a higher concentration of mesopores, and higher acidity. |
| Databáze: | OpenAIRE |
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