Co-site substitution by Mn supported on biomass-derived active carbon for enhancing magnesia desulfurization

Jie Liu, Su Lu, Lidong Wang, Tieyue Qi, Dan Qi, Xinyu Xing, Yaoyu Zhang, Huining Xiao, Shihan Zhang

Research output: Contribution to journalArticle

Abstract

Oxidation of magnesium sulfite (MgSO3) is a crucial step for reclaiming the product in wet magnesia desulfurization processes. Here, for enhancing this reaction, a bimetallic catalyst was developed by loading CoOx and MnOx species on a biomass-derived active carbon (AC) support to minimize the costs and potential environmental risks during catalyst application. The substitution effect of Mn to Co sites was investigated, and a comparison of the catalyst with plain cobalt suggested that the ratio of Co/Mn must be greater than 3. A series of catalyst characterizations was performed to reveal the synergistic effect of Co and Mn in the bimetallic catalyst. The introduction of Mn species not only improved the dispersion of CoOx–MnOx mixed oxide but also generated abundant Co3+ species and surface-adsorbed oxygen, both of which acted as the main active sites for sulfite oxidation. Notably, in the bimetallic catalyst, the presence of Mn4+ species assisted regeneration of Co2+ to Co3+ species, further accelerating sulfite oxidation. Besides, the partial substitution of Co sites by Mn also suppressed the losing of Co species during reaction, favoring to decrease the environmental risk, as well as to save the cost of catalyst.

Original languageEnglish (US)
Pages (from-to)531-537
Number of pages7
JournalJournal of Hazardous Materials
Volume365
DOIs
StatePublished - Mar 5 2019
Externally publishedYes

Fingerprint

Magnesium Oxide
Sulfites
Magnesia
Desulfurization
Biomass
substitution
Substitution reactions
Carbon
catalyst
Catalysts
carbon
biomass
sulfite
Costs and Cost Analysis
Cobalt
Oxides
Magnesium
Regeneration
environmental risk
Catalytic Domain

Keywords

  • Catalytic oxidation
  • Cobalt-sites substitution
  • Magnesium sulfite
  • Redox cycle
  • Synergistic effect

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

Cite this

Co-site substitution by Mn supported on biomass-derived active carbon for enhancing magnesia desulfurization. / Liu, Jie; Lu, Su; Wang, Lidong; Qi, Tieyue; Qi, Dan; Xing, Xinyu; Zhang, Yaoyu; Xiao, Huining; Zhang, Shihan.

In: Journal of Hazardous Materials, Vol. 365, 05.03.2019, p. 531-537.

Research output: Contribution to journalArticle

Liu, Jie ; Lu, Su ; Wang, Lidong ; Qi, Tieyue ; Qi, Dan ; Xing, Xinyu ; Zhang, Yaoyu ; Xiao, Huining ; Zhang, Shihan. / Co-site substitution by Mn supported on biomass-derived active carbon for enhancing magnesia desulfurization. In: Journal of Hazardous Materials. 2019 ; Vol. 365. pp. 531-537.
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AU - Lu, Su

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AU - Qi, Dan

AU - Xing, Xinyu

AU - Zhang, Yaoyu

AU - Xiao, Huining

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AB - Oxidation of magnesium sulfite (MgSO3) is a crucial step for reclaiming the product in wet magnesia desulfurization processes. Here, for enhancing this reaction, a bimetallic catalyst was developed by loading CoOx and MnOx species on a biomass-derived active carbon (AC) support to minimize the costs and potential environmental risks during catalyst application. The substitution effect of Mn to Co sites was investigated, and a comparison of the catalyst with plain cobalt suggested that the ratio of Co/Mn must be greater than 3. A series of catalyst characterizations was performed to reveal the synergistic effect of Co and Mn in the bimetallic catalyst. The introduction of Mn species not only improved the dispersion of CoOx–MnOx mixed oxide but also generated abundant Co3+ species and surface-adsorbed oxygen, both of which acted as the main active sites for sulfite oxidation. Notably, in the bimetallic catalyst, the presence of Mn4+ species assisted regeneration of Co2+ to Co3+ species, further accelerating sulfite oxidation. Besides, the partial substitution of Co sites by Mn also suppressed the losing of Co species during reaction, favoring to decrease the environmental risk, as well as to save the cost of catalyst.

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