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Effect of TiO2 on crystallization kinetics^ microstructure and properties of building glass-ceramics based on granite tailings
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Stereoselective synthesis of oxiranes as a source of isoserine analogues using d-glucosamine and d-glucose derivatives as chiral templates
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Unexpected relationship between specific PML isoforms and the nucleolus
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경도인지장애 노인에게 적용한 웃음요법병합 인지강화 프로그램의 효과
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Catalytic hydrocracking reactions of tetralin as aromatic biomass tar model compound to benzene/toluene/xylenes (BTX) over zeolites under ambient pressure conditions
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Y-doped BaZrO₃ 을 이용한 저온형 박막 연료전지 연구
- 검색키워드
- 저자 : David Bajec (검색결과 2 건)
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Andrii Kostyniuk,David Bajec,Blaž Likozar 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.96 No.-
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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Andrii Kostyniuk,David Bajec,Anze Prašnikar,Blaz Likozar 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.101 No.-
Producing bio-based aromatic substrates is becoming increasingly of (industrial) interest. In this mechanisticwork, the gas phase conversion of the biomass tar chemical model compounds (5 wt% naphthalene/95 wt% 1-methylnaphthalene) over the different pristine/metal-modified zeolites in acontinuous flow fixed bed reactor was investigated. Bifunctional redox acid process catalysts were synthesizedby wet impregnation method. The effect of the W (/Ni) metal formulation additives to the pristineH-beta, H-USY, H-Y, and H-ZSM-5 in the hydrocracking, hydrogenation, and isomerizationtransformation reactions of the mixture under applied ambient pressure was firstly studied. Structure,texture, morphology, acidity, composition and properties were determined by various analytical techniques. Results showed that the highest catalytic activity with a comparison to others was establishedover the 20 wt% W-beta with 96.0 mol% of the selectivity to 2-methylnaphthalene, the 93.3 mol% reactedtotal reactant after the 24 h time on stream, where ethylene/propane were predominating (80.5 wt%), andfacile manufacturing scalability. Detailed characterization methodologies have revealed that after theloading of W onto H-beta_support, a uniform functional distribution of particles, the dealumination offramework and strong interaction phenomena were observed, which led to an increase in the amountof Brønsted/Lewis/reduction surface sites, and hence, increase stability of the catalyst. In addition,equilibrium coke formation was detected, decreasing all estimated rates, undergoing also consequentexternal deactivation, blocking pores, and its burning-off regeneration being needed. While both spentW-modified (20 wt%)/unmodified H-beta/ZSM-5 exhibited the lowest carbon quantity, the same freshmaterials possessed the uppermost hierarchy factors.
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