The mineral phase reconstruction of copper slag as Fenton-like catalysts for catalytic oxidation of NO x and SO 2 : Variation in active site and radical formation pathway
Chemical Engineering Journal, ISSN: 1385-8947, Vol: 450, Page: 138101
2022
- 18Citations
- 7Captures
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Article Description
Herein, the copper slag through CaO-thermal treatment was used as a heterogeneous catalyst to activate H 2 O 2 into free radicals to remove NO x and SO 2. The NO x removal capacity of modified copper slag exhibited a volcano-type tendency with increased calcination temperatures. Because of the iron phase transformation and decrease in surface exposure Cu species by adjusting surface properties, the copper slag delivers a higher NO x capacity and H 2 O 2 utilization rate than raw copper slag and bare H 2 O 2. In addition, the interaction of multi-phases of modified copper slag was illustrated by simulation experiments. Moreover, the possible formation pathway of free radicals in the alkaline medium was proposed based on the electron paramagnetic resonance (EPR) as well as chemical quenching experiments. The surface-bound hydroxyl radical through ≡Fe 3+ sites is decisive for free radical formation in alkaline conditions. Our findings shed new light on the feasibility of SO 2 and NO x removal by metallurgical slag via mineral phase reconstruction as a novel heterogeneous catalyst.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1385894722035872; http://dx.doi.org/10.1016/j.cej.2022.138101; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85134463475&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1385894722035872; https://dx.doi.org/10.1016/j.cej.2022.138101
Elsevier BV
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