Improving Ultra-Deep Desulfurization Efficiency by Catalyst Stacking Technology

Peng, Chong; Guo, Rong; Fang, Xiangchen

doi:10.1007/s10562-015-1675-4

Cited by 13 publications

(7 citation statements)

References 15 publications

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“…Although well-established in petrochemical industry, deep desulfurization is still a matter of R&D, particularly to meet future legislative regulations addressing the sulfur fraction of fuels. [1][2][3][4][5][6] Additionally, the reduction of sulfur is also considered for coke oven gases aiming sulfur contents below 10 mol ppm, whereas up to now no cost-efficient process exists. Coke oven gas is a by-product of the steel production and mainly consists of 60 vol% H 2 , 20 vol% CH 4 and 6 vol% CO.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Kamp

Thielert

Morstein

et al. 2020

Catal. Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Kamp

Thielert

Morstein

et al. 2020

Catal. Sci. Technol.

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“…In the hydrotreating of difficult gasoil feeds with high nitrogen content, stacked beds are frequently used 5,6 , i.e. one alternates a catalyst, which has a high HDS activity with a catalyst, which has a high HDN activity.…”

Section: Introductionmentioning

confidence: 99%

“…The nitrogen species are known to be strong inhibitors of hydrodesulfurization (HDS) reactions and hydrodearomatization. Improving the hydrodenitrogenation (HDN) activity, therefore, becomes an important issue. − In the hydrotreatment of difficult gas oil feeds with high nitrogen content, stacked beds are frequently used; , i.e., one alternates a catalyst that has high HDS activity with a catalyst that has high HDN activity. To optimize the synergy between HDS and HDN in a hydrotreatment process, it is crucial to understand the reactivity and inhibition effects of the numerous nitrogen species in a gas oil mixture.…”

Section: Introductionmentioning

confidence: 99%

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Molecular-Level Insights into Coker/Straight-Run Gas Oil Hydrodenitrogenation by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

et al. 2019

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This paper aims to understand the reactivity of different nitrogen species during the catalytic hydrodenitrogenation (HDN) of a mixture of straight-run gas oil and coker gas oil. Effluents at different HDN conversions were analyzed by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR/MS), with ElectroSpray Ionization (ESI). Positive ESI (ESI(+)) allows a selective ionization of basic nitrogen compounds, while negative ESI (ESI(-)) leads to a selective ionization of neutral nitrogen compounds. FT-ICR/MS in ESI(+) or (-) mode generates distributions of the nitrogen compounds in the basic and neutral class, respectively, according to their carbon number and Double Bond Equivalent (DBE), which is related to the degree of aromaticity and the number of rings. The evolution of the DBE distribution and the carbon number distribution as a function of HDN conversion gives rich information concerning the main reaction pathways and the reactivity of different nitrogen species. For the basic compounds a shift to lower DBE was observed, which was interpreted as the formation of partially hydrogenated or ring-opened intermediates. These intermediates were then slowly converted to the final HDN products. At intermediate conversion levels, especially light compounds were accumulated as intermediates, while the heavy compounds were directly converted to HDN products, probably due to preferential adsorption. The neutral compounds showed a very different behavior. At the early reaction stages, they were quickly converted to HDN products, but at high conversion, the conversion of residual carbazole and tetrahydrobenzocarbazole compounds was completely inhibited. The inhibition was probably provoked by the formation of partially hydrogenated basic intermediates, which were stronger inhibitors than the aromatic pyridine rings in the feed. The contribution of cracking reactions was weak, since the overall carbon number distribution of the nitrogen compounds did not change much during hydrotreating.

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“…Currently over 200 desulfurization techniques exist that can be divided into three kinds according to before, during, or after combustion (Vincent et al, 2012;Peng et al, 2016). Among these methods, wet desulfurization is mature, efficient, and relatively easy to operate.…”

Section: Introductionmentioning

confidence: 99%

Application of Gas Cyclone-Liquid Jet Absorption Separator for Flue-Gas Desulfurization

Wang

Yang

et al. 2017

Aerosol Air Qual. Res.

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A gas cyclone-liquid jet absorption separator integrates the functions of cyclone separation, liquid jet atomization, and absorption separation. This study employed this device to conduct a wet flue-gas desulfurization experiment on a gas mixture consisting of air in room temperature and sulfur dioxide (SO 2 ) to explore this device's prospect of tail gas purification. Sodium hydroxide (NaOH) and sodium carbonate (Na 2 CO 3 ) solutions at various concentrations were used as absorbents under room temperature. The changes in the SO 2 removal efficiency and air pressure drop were investigated with parameters including total gas flow, SO 2 concentration in the flue gas, and absorbent flow. The SO 2 removal efficiency increased to a certain extent as the absorbent concentration, total gas flow, and absorbent flow increased. The maximum SO 2 removal efficiencies of NaOH and Na 2 CO 3 were 85% and 77%, respectively. Under identical experimental conditions, the changes in SO 2 removal efficiencies of NaOH and Na 2 CO 3 exhibited essentially identical trends, in which NaOH exhibited a 5%-8% greater SO 2 removal efficiency than Na 2 CO 3 .

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Improving Ultra-Deep Desulfurization Efficiency by Catalyst Stacking Technology

Cited by 13 publications

References 15 publications

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Molecular-Level Insights into Coker/Straight-Run Gas Oil Hydrodenitrogenation by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Application of Gas Cyclone-Liquid Jet Absorption Separator for Flue-Gas Desulfurization

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Improving Ultra-Deep Desulfurization Efficiency by Catalyst Stacking Technology

Cited by 13 publications

References 15 publications

Investigation on the simultaneous removal of COS, CS2and O2from coke oven gas by hydrogenation on a Pd/Al2O3catalyst

Investigation on the simultaneous removal of COS, CS2and O2from coke oven gas by hydrogenation on a Pd/Al2O3catalyst

Molecular-Level Insights into Coker/Straight-Run Gas Oil Hydrodenitrogenation by Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Application of Gas Cyclone-Liquid Jet Absorption Separator for Flue-Gas Desulfurization

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Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst

Investigation on the simultaneous removal of COS, CS₂and O₂from coke oven gas by hydrogenation on a Pd/Al₂O₃catalyst