Zinc-Modified ZSM-5 Nanozeolites Synthesized by the Seed-Induced Method: Interrelation of Their Textural, Acidic, and Catalytic Properties in DME Conversion to Hydrocarbons
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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.
Keywordszeolite nanocrystals zeolite catalyst dimethyl ether liquid hydrocarbons
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- 3.G. A. Mills, Chem. Tech. (Leipzig) 29, 418 (1977).Google Scholar
- 4.S. N. Khadzhiev, N. V. Kolesnichenko, N. A. Markova, et al., RU Patent No. 2442767 (2010).Google Scholar
- 5.Haldor Topsøe A/S, Selective Hydrocarbon Synthesis: Demonstration Project (EUR 11808) (Office for Official Publications of the European Communities, Luxembourg, 1988).Google Scholar
- 7.S. A. Skornikova, B. N. Bazhenov, and M. I. Tselyutina, RU Patent No. 2322294 (2008).Google Scholar
- 8.S. Lee, M. R. Gogate, K. L. Fullerton, and C. J. Kulik, US Patent No. 5459166 (1995).Google Scholar
- 9.A. Ya. Rozovskii, Khim. Interes. Ustoich. Razv. 13, 701 (2005).Google Scholar
- 11.Ya. S. Yakh”yaev, L. G. Agabalyan, N. S. Khashagul’gova, and S. N. Khadzhiev, in Proceedings of III All-Union Conferences on Mechanisms of Catalytic Reactions (Novosibirsk, 1982), Part 1, p. 126 [in Russian].Google Scholar
- 12.A. L. Lapidus and A. A. Dergachev, in Proceedings of DGMK-Conference (Munich, 2004), p. 193.Google Scholar
- 16.Z. M. Kolesnichenko, L. E. Bukina, S. A. Kitaev, et al., Pet. Chem. 56, 829 (2016).Google Scholar
- 24.S. N. Khadzhiev, N. V. Kolesnichenko, N. A. Markova, et al., RU Patent No. 2442650 (2010).Google Scholar