Preparation and performance of modified sintering dust catalysts for selective catalytic reduction of NOx with NH3
Abstract
Pretreated sintering dust catalysts were prepared by water washing or different acid (HCl, HNO3, H2SO4) solution washing method with the sintering dust as raw material. Different metal oxides (Mn, W, Cu, Ni, Co) were loaded on the sintering dust, which was washed with HNO3 by impregnation method. Then the supported sintering dust catalysts were obtained. The effects of different modified methods on the properties of the sintering dust catalysts were investigated by XRF, XRD, TG and BET, as well as the activity evaluation of NH3-SCR. The results show that sintering dust is a feasible material as the SCR catalyst. Acid washing cannot only remove the KCl and some carbonates impurity in the sintering dust and dredge the pore structure of the catalyst, but also stimulate the activity of iron oxide in the sintering dust, which can improve the NO conversions greatly. The catalyst pretreated by HNO3 washing exhibits the best catalytic activities, and the NO conversion can reach 60% at 320 °C. The loading of Mn can significantly enhance the activity of the sintering dust catalyst at the low temperatures and broaden its active temperature window under the same conditions. Specifically, the NO conversion of Mn supported catalyst exceeded 60% in the temperature range from 200 °C to 300 °C, and reached 75% at 240 °C when the Mn content was 10 wt%.
- Publication:
-
Materials Research Express
- Pub Date:
- July 2019
- DOI:
- 10.1088/2053-1591/ab10a3
- Bibcode:
- 2019MRE.....6g5502C
- Keywords:
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- sintering dust;
- pretreatment;
- supported catalyst;
- denitrification