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RISS 인기검색어
- 검색키워드
- 저자 : Blaž Likozar (검색결과 3 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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Luka Suhadolnik,Andrej Pohar,Uroš Novak,Blaž Likozar,Aleš Miheli9c,Miran Ceh 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
Reactive Red 106, a synthetic azo dye, was degraded by means of photocatalysis, electrocatalysis andphoto-electrocatalysis with an immobilized titanium dioxide nanotube catalyst. The plannedfirst part ofthe experiments was carried out inside a photo-electrocatalytic continuous-flow microreactor unit,which was used for the evaluation of the effective decomposition mechanisms, the assessment of theinvestigated degradation kinetics and the transport. The processes were described with a convection–diffusion–reaction mathematical model. Full degradation was achieved under photo-electrocatalyticoperation. The second half of the tests was executed inside a batch-vessel system, consisting of twoseparate compartments. In the anode device partition, an electrode, made of a nanometer-scaled TiO2tubefilm, was placed, whereas a Ti foil was positioned in the cathode’s electrical section. The separationof the electrolytes made it possible to analyze the conversion individually, monitoring the disintegrationof the textile pigment compound in each structural component separately, and studying the changingenvironmental phenomena for either the polarized positive or negative function. Water-based producedchemicals were determined with ultra-high-performance liquid chromatography (UHPLC), coupled withultraviolet–visible (UV–vis) or mass (MS) spectroscopy detectors. The solution was successfullydiscolored (100%) either under engineered microfluidic operation or inside a beaker’s enclosed volume. However, the rate inside the latter was faster, while there were unlike intermediate species formed ineither the anodic or cathodic electrochemical cell. The maximum conversion achieved on the anode sidewas 80% of the initial concentration of the dye, whereas 63% of the dye was degraded on the cathode side. Finally, a scaled-up input configuration was designed for treating larger feedstock capacities.
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Marko Herga,Aleš Gaspari9,Marko Bitenc,Andrej Pohar,Blaž Likozar 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-
An industrial-scale stereo-selective enzymatic oxidation process for the conversion of pyrmetazole toesomeprazole was developed and optimized. Slurry-to-slurry stages are highly demanding syntheticoperations due to several deteriorating factors: competing equilibria, mass transfer limitations and longtermbio-catalytic activity. Challenging characteristics of this bio-oxidation included foaming, thickening,continuous dynamic changes in viscosity, mass transport, and bio-catalyst inactivation. By screening pH,optimization of reactant loading ratios, and modification of control, crucial production attributes ofmaterials, such as substrate particle size, were controlled and better batch-to-batch stability and scale-upwas achieved.
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