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Application of Fenton sludge coupled selective acid leaching in selective catalytic reduction of NOx: Performance and mechanisms.
- Source :
-
Fuel . Oct2022, Vol. 326, pN.PAG-N.PAG. 1p. - Publication Year :
- 2022
-
Abstract
- [Display omitted] • Fenton sludge is used to prepare SCR iron-based catalyst. • Physical and chemical properties of the catalyst are characterized in detail. • An alternative method was provided to dispose Fenton sludge. • The optimum acid leaching conditions were explored in detail. • NO x conversion can reach 100% at 301–450 °C. Fenton sludge is a type of industrial hazardous waste produced after the Fenton reaction treats industrial wastewater that contains a large amount of iron oxide and other metallic elements. In this study, an efficient treatment method for preparing a selective catalytic reduction catalyst from Fenton sludge is proposed. Fenton sludge was treated using a selective acid leaching method, and the effects of four main factors were systematically studied. The experimental results showed that the dealkalization extent reached 94.8% and the retention extent of active components was 90.46% under the condition of the liquid-to-solid ratio of 6 mL/g, acid leaching temperature of 80 °C, acid leaching time of 60 min and acid dosage of 20%. The modified Fenton sludge catalyst (MFS) achieved 100% NO x conversion in the temperature range 301–450 °C, which is a wide reaction temperature range and excellent low-temperature catalytic activity. The selective dealkalization treatment can effectively inhibit the high-temperature sintering of the catalyst, increase the specific surface area and porosity of the catalyst and improve the redox performance of the catalyst. Moreover, the high O β concentration, Fe3+/Fe2+ ratio and number of oxygen vacancies contributed to the excellent catalytic performance of MFS. [ABSTRACT FROM AUTHOR]
- Subjects :
- *CATALYTIC reduction
*LEACHING
*METALS
*HAZARDOUS wastes
*SEWAGE
*CATALYTIC activity
Subjects
Details
- Language :
- English
- ISSN :
- 00162361
- Volume :
- 326
- Database :
- Academic Search Index
- Journal :
- Fuel
- Publication Type :
- Academic Journal
- Accession number :
- 158368892
- Full Text :
- https://doi.org/10.1016/j.fuel.2022.125058