期刊
CHEMICAL ENGINEERING JOURNAL
卷 407, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127210
关键词
Wet desulfuration; Sulfite oxidation; Lattice confinement; Free radicals; Reaction mechanism
资金
- National Key Research and Development Program of China [2016YFC0204100]
- Natural Science Foundation of Hebei Province [2019502199]
- Fundamental Research Funds for the Central Universities [2019MS108]
In this study, a lattice confined Co-based catalyst was constructed through the in situ growth of Co active sites in MCM-48 molecular sieves to enhance the oxidation of magnesium sulfite. The anchoring of separated Co sites in MCM-48 matrix favored to inhibit the leaching of Co element and promote the generation of (SO5-)-S-center dot radical for the fastened oxidation of MgSO3.
Magnesium sulfite oxidation is a crucial process in wet desulfurization which inhibits the re-emission of SO2 efficiently, and the development of catalyst with high activity and stability is still a challenge. In this study, a lattice confined Co-based catalyst was constructed through the in situ growth of Co active sites in MCM-48 molecular sieves (Co-MCM-48). The anchoring of separated Co sites in MCM-48 matrix favored to enhance the MgSO3 oxidation and inhibit the leaching of Co element. From the atom-level, the sulfite adsorption was enhanced on the isolated and defected Co sites, and the (SO3-)-S-center dot intermediate was considerably easy to generate due to the enhanced loss of electrons in sulfite. Meanwhile, the adsorption of O-2 was improved by Co-MCM-48, and the adsorbed O-2 (O-2(ad) ) accelerated the production of (SO5-)-S-center dot radical by the process of (SO3-)-S-center dot + O-2(ad) -> (SO5-)-S-center dot, which play key roles for the fastened oxidation of MgSO3.
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