首页|Tuning the selectivity on the furan-propylene Diels-Alder condensation over acid catalysts: Role of pore topology and surface acidity
Tuning the selectivity on the furan-propylene Diels-Alder condensation over acid catalysts: Role of pore topology and surface acidity
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NSTL
Elsevier
This work is focused on obtaining aromatics from renewable resources by propylene-furan Diels-Alder condensation. Several acid catalysts with different pore topology and SiO2/Al2O3 ratios were considered to gain further understanding of the molecular sieve and acidity effects on the selectivity towards different fractions and the catalytic stability. Experiments were performed in a fixed bed reactor at 500 degrees C, WHSV = 17.4 h(-1) and 3:1 propylene:furan molar ratio. Small pore-size materials (CHA, FER, MOR) are mainly selective to alkenes following cracking and oligomerization pathways, whereas materials with a larger pore size (FAU, MCM-41) produce polycyclic compounds and coke precursors. BEA and mainly MFI zeolites have the optimum topology to produce aromatics, mainly toluene. Experimental results suggest a competition between condensation and alkylation, the first one being promoted by the strongest acidic sites. These data provide the basis of a comprehensive reaction mechanism that allows anticipating the product distribution as a function of the catalytic properties of the considered material.
NSTL
Elsevier
