Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 309, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2022.122942
Keywords
Hierarchical zeolites; Indanols; Selective dehydration; Indene; Acid sites
Funding
- National Research Foundation of Ukraine [2020.02/0335]
- Verkhovna Rada of Ukraine
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Hierarchical zeolites with different topology and morphology were evaluated for the dehydration of a series of substituted 4-bromo-2-alkyl-2,3-dihydro-1H-indan-1-ols. Optimal acid sites strength was found to be crucial for high conversion and selectivity, while stronger or weaker acidity led to undesired by-products or low conversion rates. Medium strength acid sites were identified as preferable for selective dehydration of the substrates.
Hierarchical zeolites of different topology and morphology (Al-, Ga- and B-silicate zeolites of MOR, BEA, MFI and MTW structural types with the morphology of aggregated nanosheets, nanorods, or close to spherical nanoparticles) were evaluated in the dehydration of a homologous series of substituted 4-bromo-2-alkyl-2,3-dihydro1H-indan-1-ols. The optimal strength of the catalyst's acid sites providing both high indanols conversion and selectivity towards indenes (up to 99%) was found for each of the studied substrates. Stronger acid sites than optimal ones resulted in the formation of by-products of self-alkylation of the initial indanols by the formed indenes or alkylation of benzene used as a solvent. Weak acidity of the catalysts led to low substrate conversion and the presence of the corresponding ether. A correlation between the catalyst acidity and the yield of the desired product was found. Medium strength acid sites were discovered to be preferable for the selective dehydration of substituted 4-bromo-2,3-dihydro-1H-indan-1-ol.
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