Natural manganese ore catalyst for low-temperature selective catalytic reduction of NO with NH3 in coke-oven flue gas
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Different types of manganese ore raw materials were prepared for use as catalysts, and the effects of different manganese ore raw materials and calcination temperature on the NO conversion were analyzed. The catalysts were characterized by XRF, XRD, BET, XPS, H2-TPR, NH3-TPD, and SEM techniques. The results showed that the NO conversion of calcined manganese ore with a Mn:Fe:Al:Si ratio of 1.51:1.26:0.34:1 at 450 °C reached 80% at 120 °C and 98% at 180~240 °C. The suitable proportions and better dispersibility of active ingredients, larger BET surface area, good reductibility, a lot of acid sites, contents of Mn4+ and Fe3+, and surface-adsorbed oxygen played important roles in improving the NO conversion.
KeywordsManganese ore Selective catalytic reduction Low temperature NO
We greatly appreciate the financial support provided by the National Natural Science Foundation of China (Nos. 51676001, 51376007, and U1660206), the Anhui Provincial Natural Science Foundation (No. 1608085ME104), and Key Projects of Anhui Province University Outstanding Youth Talent (Nos. gxyqZD2016074 and gxyqZD2017038).
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