Selective hydrocracking of tetralin for light aromatic hydrocarbons

Lee, Jihye; Choi, Yong-Sung; Shin, Jaeuk; Lee, Jeong Kyu

doi:10.1016/j.cattod.2015.09.046

Cited by 51 publications

(46 citation statements)

References 26 publications

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“…It is worth remembering that although the aromatic hydrogenation is reversible, exothermic, and thermodynamically favorable at 200-250 °C and 3-5 MPa with hydrogenation equilibrium constants below the unit at 350 °C [1] according to Boucenaur et al [4] at 500 °C, only 8 min on stream were required for 30% of tetralin conversion and as the temperature increased, the naphthalene presence linearly increased above other thermal cracked products like 1-methylindane and n-butylbenzene. Therefore, the result indicates that naphthalene can be formed either by the thermodynamic equilibrium [1,16] and/or as a thermal cracking by-product [4]. The low observed BTX amount was the result of the lack of strong acidic functions in the catalyst [11,18].…”

Section: Effect Of the Experimental Conditions On The Tetralin Convermentioning

confidence: 94%

“…The BTX yield was never above 10 wt%, being the high HYD/DEHYD value due mostly to the presence of naphthalene and just a small amount of decalin derivatives. The naphthalene presence may not be only caused by the thermodynamic equilibrium that favors the tetralin dehydrogenation reaction [1,16], but also by the thermal cracking as a result of the extremely severe experimental conditions used (450-500 °C, 3.9-4.9 MPa and H 2 /feed volume ratio of 178-267 m 3 /m 3 ) [4,23]. It is worth remembering that although the aromatic hydrogenation is reversible, exothermic, and thermodynamically favorable at 200-250 °C and 3-5 MPa with hydrogenation equilibrium constants below the unit at 350 °C [1] according to Boucenaur et al [4] at 500 °C, only 8 min on stream were required for 30% of tetralin conversion and as the temperature increased, the naphthalene presence linearly increased above other thermal cracked products like 1-methylindane and n-butylbenzene.…”

Section: Effect Of the Experimental Conditions On The Tetralin Convermentioning

confidence: 99%

“…However, naphthalene was also observed at both 450 and 500 °C. As it was noted, the naphthalene formation may be due to either tetralin/naphthalene thermodynamic equilibrium [1,16] and/or thermal cracking processes [4,22]. It is quite important to remember that ZSM-5 is a zeolite with relatively small pore size and it has been found that the size of the pores may vary the product distribution.…”

Section: Effect Of the Experimental Conditions On Tetralin Conversionmentioning

confidence: 99%

“…More specifically, ZSM-5, in its hydrogen form, has Brönsted and Lewis acidity with acid OH groups at channel intersections. The presence of acid sites explains the cracking activity displayed by ZSM-5, which shows unique shapeselectivity properties due to the presence of medium-size pores [16,20]. In addition, the hydrogenation power of a metallic function is necessary to minimize excessive cracking and polymerization reactions that can poison the acid sites and finally can lead to catalyst deactivation [15,19,20].…”

Section: Introductionmentioning

confidence: 99%

“…In order to avoid the interference of the metal moieties on the acidic zeolite structure, as Sato et al [18] reported, it was used a mechanical mixture of NiMo/Al 2 O 3 and ZSM-5. This mixture was chosen taking into account the adequate hydrogenation activity of the NiMo metals mixture and the acidic properties of the ZSM-5 zeolite, with high dealkylation activity [16,20]. The study was carried out in a trickle-bed reactor at 450-500 °C, 3.9-5.9 MPa, 1.3/h (liquid hourly space velocity, LHSV) and 117-267, H 2 /feed volume ratio m 3 /m 3 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of the catalytic system and operating conditions on BTX formation using tetralin as a model molecule

et al. 2019

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Light cycle oil (LCO) is an inexpensive feedstock for the production of high-added-commercial-value-mono-aromatic compounds such as benzene, toluene and xylenes (BTX). To extend the knowledge on the processing of LCO for BTX production, the hydrocracking reaction was studied using a commercial NiMo/Al 2 O 3 catalyst, ZSM-5 zeolite and their mechanical mixtures (20/80, 30/70 and 50/50) for processing tetralin as model feedstock in a bench-scale-trickle-bed reactor at 450-500 °C, 3.9-5.9 MPa, 1.3 1/h and H 2 /feed volume ratio of 168-267 m 3 /m 3. Accessible, well-dispersed and strong Brönsted acid sites eased the hydrocracking of tetralin to BTX and the metallic hydrogenation functions from nickel-molybdenum catalysts were also required to minimize deactivation. To achieve suitable tetralin conversions (86-95 wt%), high BTX selectivity in the liquid phase (44-70 wt%) and suitable catalytic activities for coke precursor hydrogenation (to reduce deactivation), NiMo/Al 2 O 3 //ZSM-5 mixtures (50-80 ZSM-5) were employed, which probed to be effective.

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Section: Effect Of the Experimental Conditions On The Tetralin Convermentioning

confidence: 94%

Section: Effect Of the Experimental Conditions On The Tetralin Convermentioning

confidence: 99%

Section: Effect Of the Experimental Conditions On Tetralin Conversionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the catalytic system and operating conditions on BTX formation using tetralin as a model molecule

et al. 2019

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Sustainable Liquid‐Organic‐Hydrogen‐Carrier‐Based Hydrogen‐Storage Technology Using Crude or Waste Feedstock/Hydrogen

Kim,

Yoon,

Kim

et al. 2024

Adv Energy and Sustain Res

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For liquid organic hydrogen carrier (LOHC) technology to be competitive with other H2‐storage methods, it is crucial to reduce the cost of LOHC materials occupying the high proportion of the embodied energy required for system implementation. Promising approaches are to convert crude or waste feedstock into LOHC materials and to utilize crude hydrogen sources obtained from various routes. Thus, in this review, the state‐of‐the‐art advances in sustainable LOHC‐based hydrogen storage using crude or waste feedstock, associated with their conversion into LOHC materials, and coupling crude hydrogen with LOHC system to obtain high‐purity H2 without separation and purification are highlighted. Petroleum sources like light cycle oil and pyrolysis fuel oil are used after liquid–liquid extraction, combined distillation/hydroprocessing, and one‐pot hydrotreating–hydrocracking. In case of converting renewable resources (e.g., biomass and plastic waste), depolymerization followed by hydrodeoxygenation is an effective approach. To utilize crude hydrogen sources for hydrogen storage, catalysts should be designed and synthesized toward activating LOHC hydrogenation reaction at lower temperatures, along with high CO resistance. Consequently, this context provides guidance for the development of LOHC technology to accelerate its commercialization.

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Selective C−C Hydrogenolysis of Alkylbenzenes to Methylbenzenes with Suppression of Ring Hydrogenation

et al. 2018

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Selective reduction of alkylbenzenes, which are supplied by refining heavy hydrocarbons, to methylbenzenes by selective CÀC hydrogenolysis was accomplished by Ru/CeO 2 catalyst. Hydrogenolysis of ethylbenzene was carried out with gas-phase fixed-bed flow reactor and various noble metal catalysts. The catalyst with high Ru loading (4 wt%) on CeO 2 support precalcined at high temperature (1073 K; Ru(4)/CeO 2 1073 catalyst) showed both good activity and selectivity to toluene. The yield of toluene reached 65 %-C in the conditions of 533 K and H 2 partial pressure of 0.075 MPa. Hydrogenolysis of other alkylbenzenes including p-ethyltoluene, propylbenzene and cumene was also carried out. Hydrogenolysis of C aryl -C alkyl bond and hydrogenation of benzene ring was slow in all substrate cases. Hydrogenolysis of p-ethyltoluene can give p-xylene as the main product (highest yield: 53 %-C). These high yields of methylbenzenes make a marked contrast to the traditional bifunctional hydrocracking systems which preferably dissociate C aryl -C alkyl bond in alkylbenzenes. Characterization of Ru catalysts suggests that the block-shaped Ru particles with small size (< 2 nm) in Ru(4)/CeO 2 1073 give good catalytic performance. Too strong interaction between Ru species and CeO 2 support induced by decreasing the loading amount rather gives ring-hydrogenation activity and decreases methylbenzenes selectivity.[a] S.

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Selective hydrocracking of tetralin for light aromatic hydrocarbons

Cited by 51 publications

References 26 publications

Effect of the catalytic system and operating conditions on BTX formation using tetralin as a model molecule

Effect of the catalytic system and operating conditions on BTX formation using tetralin as a model molecule

Sustainable Liquid‐Organic‐Hydrogen‐Carrier‐Based Hydrogen‐Storage Technology Using Crude or Waste Feedstock/Hydrogen

Selective C−C Hydrogenolysis of Alkylbenzenes to Methylbenzenes with Suppression of Ring Hydrogenation

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