Catalytic hydrocracking reactions of tetralin as aromatic biomass tar model compound to benzene/toluene/xylenes (BTX) over zeolites under ambient pressure conditions

다국어 초록 (Multilingual Abstract)

The gas phase selective hydrocracking process of tetralin (biomass tar model chemical compound) intobenzene, toluene and xylenes (BTX) was carried out over the H-Beta, H-Mordenite, H-USY, H-Y, and HZSM-5 zeolite catalysts in a packed bed reactor under applied atmospheric pressure. To the best of ourscientific knowledge, this performed work presents thefirst systematic investigation, focused on tetralin,cracking to BTX under ambient 1 bar. The highest catalytic activity and carbon deposition resistance wereestablished over the H-ZSM-5 (SiO2/Al2O3 = 30) with the selectivity to the BTX of 52.2 mol.% inintermediates’ liquid phase, 88.7 mol.% of total conversion yield after the 4 h time on stream, 370 C andgas hourly space velocity (GHSV) = 530 h–1, and limited site deactivation. The gas phase was analyzed andethylene, propane, ethane and methane were identified as main gas products in the product mixture atdifferent reaction conditions. All catalysts were characterized by BET, ICP-AES, XRD, HRSEM, NH3-TPD,and pyridine-DRIFT technique. This high catalytic performance of the H-ZSM-5 catalyst is attributed tothe presence the high mesopore volume and mesopore surface area, the mild acidity and the highestBrönsted to Lewis acid sites ratio (BAS/LAS) comparing with other studied zeolite catalysts. Based on theexperimental results, the reaction pathway of tetralin transformation into BTX was proposed.
Hydrocracking, ring opening, ring contraction, dehydrogenation/hydrogenation, alkylation/dealkylation,isomerization, and overcracking reactions were involved. Results were consistent with the occurrence ofthe monomolecular reaction mechanism.

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