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- Title
Metal-Containing Granulated Yh Zeolites with Hierarchic Structure in Isophorone Aromatization.
- Authors
Grigor'eva, N. G.; Kirsanov, V. Yu.; Korzhova, L. F.; Karchevskii, S. G.; Khazipova, A. N.; Bubennov, S. V.; Bikbaeva, V. R.; Serebrennikov, D. V.; Kutepov, B. I.
- Abstract
The physicochemical properties of a series of catalysts based on granulated Na-Yh zeolite with the hierarchic (micro–meso–macro) pore structure (Na-Yh, HNa-Yh, MgO/Na-Yh, La2O3/Na-Yh, TiO2/Na-Yh) and the activity and selectivity of these catalysts in isophorone aromatization were studied. MgO/Na-Yh and La2O3/Na-Yh zeolites with high content of basic sites and low content of Brønsted acid sites are the most effective in the synthesis of 3,5-dimethylphenol: The 3,5-dimethylphenol formation selectivity reaches 63–69% at 87–94% isophorone conversion. In the presence of Na-Yh zeolite containing both acid and base sites, the prevalent reactions are isophorone isomerization and synthesis of trimethylbenzenes. The modification of Na-Yh with titanium oxide leads to an increase in the content of acid sites on the TiO2/Na-Yh surface and to the prevalence of the aromatization to form trimethylbenzenes. In the presence of HNa-Yh containing a set of the strongest Brønsted and Lewis acid sites, isophorone transforms into a mixture of polymethylbenzenes.
- Subjects
ISOPHORONE; AROMATIZATION; ZEOLITES; CATALYST selectivity; AROMATIZATION catalysts; BRONSTED acids
- Publication
Petroleum Chemistry, 2024, Vol 64, Issue 2, p267
- ISSN
0965-5441
- Publication type
Article
- DOI
10.1134/S0965544124020038