Uniform dispersion of cobalt nanoparticles over nonporous TiO2 with low activation energy for magnesium sulfate recovery in a novel magnesia-based desulfurization process

Lidong Wang, Tieyue Qi, Juan Wang, Shihan Zhang, Huining Xiao, Yongliang Ma

Research output: Contribution to journalArticle

Abstract

The forced oxidation of magnesium sulfite (MgSO3) aims to not only reclaim the by-product in the magnesia desulfurization, but also lower the risk of secondary pollution. The non-porous titanium dioxide nanoparticle was used as a support to prepare the cobalt catalyst (Co-TiO2) in order to expedite the oxidation rate. This fabricated Co-TiO2 was characterized by inductively coupled plasma optical emission spectroscopy (ICP-OES), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and energy dispersive spectroscopy (EDS) to figure out its catalytic mechanism. The results revealed that the cobalt nanoparticles were uniformly dispersed on the surface of the TiO2 in forms of Co3O4 and Co2O3. The kinetics of the MgSO3 oxidation catalyzed by the prepared Co-TiO2 was investigated in a bubbling tank reactor, indicating that the oxidation rate was dependent on the catalyst concentration, oxygen partial pressure, pH value, and the reaction temperature. Compared with the reported porous catalyst (Co-CNTs), the activation energy with the Co-TiO2 (17.29 kJ mol−1) decreased by 50.9%, resulting in a good catalytic performance in sulfite oxidation. The findings will help advance the industrial application of the novel magnesia desulfurization process.

Original languageEnglish (US)
Pages (from-to)579-588
Number of pages10
JournalJournal of Hazardous Materials
Volume342
DOIs
StatePublished - Jan 15 2018

Fingerprint

Magnesium Oxide
Magnesium Sulfate
Sulfites
Cobalt
Nanoparticles
Spectrum Analysis
Oxidation
Avian Leukosis
oxidation
Magnesia
Desulfurization
Catalysts
Afferent Loop Syndrome
Myosins
cobalt
catalyst
Photoelectron Spectroscopy
Partial Pressure
Titanium
Transmission Electron Microscopy

Keywords

  • Kinetics
  • Magnesium sulfite
  • Oxidation
  • Supported catalyst
  • TiO

ASJC Scopus subject areas

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

Cite this

Uniform dispersion of cobalt nanoparticles over nonporous TiO2 with low activation energy for magnesium sulfate recovery in a novel magnesia-based desulfurization process. / Wang, Lidong; Qi, Tieyue; Wang, Juan; Zhang, Shihan; Xiao, Huining; Ma, Yongliang.

In: Journal of Hazardous Materials, Vol. 342, 15.01.2018, p. 579-588.

Research output: Contribution to journalArticle

Wang, Lidong; Qi, Tieyue; Wang, Juan; Zhang, Shihan; Xiao, Huining; Ma, Yongliang / Uniform dispersion of cobalt nanoparticles over nonporous TiO2 with low activation energy for magnesium sulfate recovery in a novel magnesia-based desulfurization process.

In: Journal of Hazardous Materials, Vol. 342, 15.01.2018, p. 579-588.

Research output: Contribution to journalArticle

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