Monitoring the ambient oxidation of a NiMoSx/Al2O3 hydrotreating catalyst by a thermogravimetric method

Wang, Hao; He, Shiang; Li, Yang; Qin, Haihang; Wu, Yan

doi:10.1016/j.tca.2022.179381

Cited by 2 publications

(4 citation statements)

References 43 publications

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“…The results are listed in Figure . As reported previously, when LHT is exposed to air for 7 days, the percentages of Mo 4+ and Ni 2+ in NiMoS as well as S 2– in metal sulfides significantly decrease. However, for LHT-400C and LHT-500C, the decrease in these species is remarkably inhibited, particularly at a passivation temperature of 500 °C.…”

Section: Resultssupporting

confidence: 85%

“…The oxidation of Mo and Ni sulfides could reach an equilibrium state, leading to the nearly constant mass loss of zones II and IV after a long exposure time. As reported previously, 11 the unpassivated catalyst reached the stable stage after 15 days exposure.…”

Section: N 2 Ads−desorptionsupporting

confidence: 86%

“…As reported previously, thermal analysis in air can monitor the oxidation of the sulfurized catalyst. The TG, DTG, and DTA curves of LHT-300C, LHT-400C, and LHT-500C exposed to ambient air for different periods are shown in Figures and S4.…”

Section: Resultsmentioning

confidence: 78%

“…In previous research, 11 our group developed a thermogravimetric (TG) method to monitor the oxidation of a commercial NiMoS x /γ-Al 2 O 3 HT catalyst exposed to ambient air for different periods. The different mass loss stages of the sulfurized catalyst were related to the decomposition of specific oxidation products.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultssupporting

confidence: 85%

Section: N 2 Ads−desorptionsupporting

confidence: 86%

Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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The impact of the water phase in the gasoil fraction on the CoMo hydrotreating catalyst's performance

Bykova,

Nadeina,

Vatutina

et al. 2024

Fuel

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Monitoring the ambient oxidation of a NiMoSx/Al2O3 hydrotreating catalyst by a thermogravimetric method

Cited by 2 publications

References 43 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

The impact of the water phase in the gasoil fraction on the CoMo hydrotreating catalyst's performance

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Monitoring the ambient oxidation of a NiMoSx/Al2O3 hydrotreating catalyst by a thermogravimetric method

Cited by 2 publications

References 43 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

The impact of the water phase in the gasoil fraction on the CoMo hydrotreating catalyst's performance

Contact Info

Product

Resources

About

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