Nanodispersed Suspensions of Zeolite Catalysts for Converting Dimethyl Ether into Olefins
| Autor: | G. N. Bondarenko, N. V. Kolesnichenko, N. N. Ezhova, S. N. Khadzhiev, O. V. Yashina |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science 010405 organic chemistry 010402 general chemistry 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Hydrocarbon Adsorption chemistry Chemical engineering Specific surface area Dimethyl ether Particle size Superacid Physical and Theoretical Chemistry Zeolite |
| Zdroj: | Russian Journal of Physical Chemistry A. 92:118-123 |
| ISSN: | 1531-863X 0036-0244 |
| DOI: | 10.1134/s0036024418010120 |
| Popis: | Nanodispersed suspensions that are effective in DME conversion and stable in the reaction zone in a three-phase system (slurry reactor) are obtained from MFI zeolite commercial samples (TsVM, IK-17-1, and CBV) in liquid media via ultrasonic treatment (UST). It is found that the dispersion medium, in which ultrasound affects zeolite commercial sample, has a large influence on particle size in the suspension. UST in the aqueous medium produces zeolite nanoparticles smaller than 50 nm, while larger particles of MFI zeolite samples form in silicone or hydrocarbon oils. Spectral and adsorption data show that when zeolites undergo UST in an aqueous medium, the acid sites are redistributed on the zeolite surface and the specific surface area of the mesopores increases. Preliminary UST in aqueous media of zeolite commercial samples (TsVM, IK-17-1, and CBV) affects the catalytic properties of MFI zeolite nanodispersed suspensions. The selectivity of samples when paraffins and olefins form is largely due to superacid sites consisting of OH groups of hydroxonium ion H3O+. |
| Databáze: | OpenAIRE |
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