Promoting effects of SO42− on a NiMo/γ-Al2O3 hydrodesulfurization catalyst

Liu, Zhiwei; Han, Wei; Hu, Dawei; Nie, Hong; Wang, Zhen; Sun, Shi‐Gang; Deng, Zhonghuo; Yang, Qi

doi:10.1039/d0cy01004a

Cited by 21 publications

(10 citation statements)

References 67 publications

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“…For the Ni 2p 3/2 spectra, a peak around 856.7 eV attributed to Ni 2+ in NiO 33,34 and a peak around 862.4 eV attributed to shakeup satellite line of Ni 2+ are present in all samples. 35 However, an additional peak at 855.9 eV attributed to Ni 2+ in NiAl 2 O 4 is solely observed in QT-500C.…”

Section: N 2 Ads−desorptionmentioning

confidence: 85%

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Effect of Liquid Passivation on the Oxidation Resistance and Hydrodesulfurization Activity of the NiMoS_x/Al₂O₃ Catalyst

Wen,

He,

et al. 2024

Energy Fuels

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Toluene and rapeseed oil were, respectively, used to passivate a commercial oxidic NiMo/Al 2 O 3 hydrotreating catalyst to prevent the sulfurized catalyst from oxidation and reduce the activity loss. The passivation at 400 and 500 °C by rapeseed oil can form carbon deposits with an amorphous-like graphite structure on the catalyst; however, passivation at 300 °C forms less carbon deposits. The high temperature facilitates carbon deposits with bigger size and more defects. After sulfurization and air exposure for 7 days, the oxidation degrees of Mo and Ni sulfides in the catalyst determined by TG are, respectively, decreased by 82.7 and 59.3% and 83.8 and 79.1% after 400 and 500 °C passivation. The rate constants of dibenzothiophene hydrodesulfurization of the initial sulfurized catalysts without passivation and passivated at 400 and 500 °C are 1.46, 1.49, and 0.83 mmol g −1 h −1 , respectively. The enhanced activity at 400 °C is ascribed to shorter MoS 2 slabs and the formation of Mo 2 C. However, the inert NiAl 2 O 4 formed at 500 °C causes significantly decreased activity. After 7 days of air exposure, the rate constants of catalysts without passivation and passivated at 400 °C are 1.15 and 1.40 mmol g −1 h −1 , respectively. The carbon deposits produced by passivation with rapeseed oil at 400 °C could effectively inhibit oxidation and reduce the activity loss, which is promising for ex situ sulfurized hydrotreating catalysts.

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Section: N 2 Ads−desorptionmentioning

confidence: 85%

“…For the Ni 2p 3/2 spectra, a peak around 854.2 eV is attributed to Ni 2+ in NiMoS, 33,34 while two peaks around 856.8 and 862.2 eV are, respectively, assigned to Ni 2+ in NiSO 4 and its shakeup satellite line. 42 After exposure to air for 7 days, the percentage of NiMoS decreases, while that of NiSO 4 increases.…”

Section: N 2 Ads−desorptionmentioning

confidence: 99%

Effect of Liquid Passivation on the Oxidation Resistance and Hydrodesulfurization Activity of the NiMoS_x/Al₂O₃ Catalyst

Wen,

He,

et al. 2024

Energy Fuels

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“…Liu et al studied the promoting effects that sulfate has on a NiMo/γ-Al 2 O 3 catalyst and the promotion effect of Chromium on the activity and SO 2 resistance of CeO 2 -TiO 2 catalysts for the NH 3 -SCR reaction. Induced evolved gas analysis showed the hydrodesulfurization activity and proved that the catalyst has high metal dispersion and good stability [ 88 , 89 ]. Chen and coworkers used UV Raman, TG-MS (TPO), and nitrogen physisorption characterization to characterize deactivated Mo/HZSM-5 catalysts [ 90 ].…”

Section: Applications To Catalystmentioning

confidence: 99%

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

et al. 2022

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Advances in on-line thermally induced evolved gas analysis (OLTI-EGA) have been systematically reported by our group to update their applications in several different fields and to provide useful starting references. The importance of an accurate interpretation of the thermally-induced reaction mechanism which involves the formation of gaseous species is necessary to obtain the characterization of the evolved products. In this review, applications of Evolved Gas Analysis (EGA) performed by on-line coupling heating devices to mass spectrometry (EGA-MS), are reported. Reported references clearly demonstrate that the characterization of the nature of volatile products released by a substance subjected to a controlled temperature program allows us to prove a supposed reaction or composition, either under isothermal or under heating conditions. Selected 2019, 2020, and 2021 references are collected and briefly described in this review.

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“…Therefore, reducing or even totally removing sulfur contents in fuel oils is an inevitable trend, which is also of great significance for improving the global environment and achieving sustainable development. , At present, fuel desulfurization technology can be divided into two categories: hydrodesulfurization (HDS) and non-HDS. Among them, HDS needs to be carried out under high-temperature and high-pressure conditions, making the cost of HDS relatively high. − Compared with other organic sulfur compounds, refractory sulfur (RS) compounds have larger steric hindrances and are more stable and difficult to remove in HDS. , Under this circumstance, researchers have conducted a series of studies on non-HDS approaches such as biological desulfurization, , extractive desulfurization, − adsorptive desulfurization, − oxidative desulfurization (ODS), − etc . Among all these non-HDS methods, ODS has been proved to be an efficient one, in which organic sulfides are oxidized to sulfoxides or sulfones with higher polarities under mild conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Density Functional Theory Approaches for Desulfurization of Dibenzothiophene from Diesel Fuel with Imidazole-Based Heteropolyacid Catalysts

et al. 2023

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Oxidative desulfurization (ODS) has been proved to be an efficient strategy for the removal of aromatic sulfur compounds from diesel oils, which are one of the main sources of air pollution. Heteropolyacid catalysts are highly active species for ODS, but the promotion of their catalytic activity and clarification of their catalytic mechanism remain an important issue. Herein, a series of novel imidazole-based heteropolyacid catalysts are prepared by a one-pot method for multiphase deep ODS of fuel with hydrogen peroxide as an oxidant. The experimental results show that the desulfurization performance of the prepared imidazole-based heteropolyacid catalysts is high up to 99.9% under mild conditions. The catalyst also possesses excellent recovery performance, and the desulfurization activity remains at 97.7% after being recycled seven times. Furthermore, density functional theory calculation is first employed to clarify the origin of the high desulfurization activity, and the results show that with the imidazole-based heteropolyacid (HPW-VIM) as the catalyst, the energy barrier is much lower than that with phosphotungstic acid (HPW) as the catalyst.

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Promoting effects of SO₄²⁻ on a NiMo/γ-Al₂O₃ hydrodesulfurization catalyst

Abstract: SO42− anchors to a NiMo/γ-Al2O3 catalyst, weakening the metal–support interactions, inhibiting MoS2 aggregation, increasing the number of Ni–Mo–S sites, and thus improving its activity and stability.

Cited by 21 publications

References 67 publications

Effect of Liquid Passivation on the Oxidation Resistance and Hydrodesulfurization Activity of the NiMoS_x/Al₂O₃ Catalyst

Effect of Liquid Passivation on the Oxidation Resistance and Hydrodesulfurization Activity of the NiMoS_x/Al₂O₃ Catalyst

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

Experimental and Theoretical Density Functional Theory Approaches for Desulfurization of Dibenzothiophene from Diesel Fuel with Imidazole-Based Heteropolyacid Catalysts

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Promoting effects of SO42− on a NiMo/γ-Al2O3 hydrodesulfurization catalyst

Abstract: SO42− anchors to a NiMo/γ-Al2O3 catalyst, weakening the metal–support interactions, inhibiting MoS2 aggregation, increasing the number of Ni–Mo–S sites, and thus improving its activity and stability.

Cited by 21 publications

References 67 publications

Effect of Liquid Passivation on the Oxidation Resistance and Hydrodesulfurization Activity of the NiMoSx/Al2O3 Catalyst

Effect of Liquid Passivation on the Oxidation Resistance and Hydrodesulfurization Activity of the NiMoSx/Al2O3 Catalyst

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

Experimental and Theoretical Density Functional Theory Approaches for Desulfurization of Dibenzothiophene from Diesel Fuel with Imidazole-Based Heteropolyacid Catalysts

Contact Info

Product

Resources

About

Promoting effects of SO₄²⁻ on a NiMo/γ-Al₂O₃ hydrodesulfurization catalyst

Effect of Liquid Passivation on the Oxidation Resistance and Hydrodesulfurization Activity of the NiMoS_x/Al₂O₃ Catalyst

Effect of Liquid Passivation on the Oxidation Resistance and Hydrodesulfurization Activity of the NiMoS_x/Al₂O₃ Catalyst