Mechanochemical activation of titanium slag for effective selective catalytic reduction of nitric oxide

The Science of the Total Environment
Hao HouJia Zhang

Abstract

Ti-bearing blast furnace slag was usually recycled by acid leaching. For the first time, a catalyst was synthesized from the slag by wet ball-milling. During this process, no waste was produced. When the activated slag was used in selective catalytic reduction of nitric oxide (NO), 80.5 ± 1.2% of NO (990 ppm) was removed at 350 °C. The catalyst steadily removed 91.0 ± 1.3% of NO for 900 min at 400 °C. On the contrary, the slag without activation showed almost no catalytic activity at these temperatures. The enhanced activity was mainly attributed to the following characterizations. After wet ball-milling, specific surface area of the slag was increased from 2.595 to 26.497 m2/g; surface acid sites were amplified by 15 times; Fe/Ti ratio on surface was enhanced from 0.20 to 1.10. At the same time, surface Fe2+/Fe3+ was regulated from 0.43 to 0.53. The above enhanced properties were attributed to the mechanochemical activation, which dissolved and re-deposited active species on particle surface as well as reinforced the effect between Fe and Ti species. The main result of this work put forward a green method for the direct utilization of industrial waste without generating by-products.

References

Oct 9, 2009·Waste Management·Xiuying GuoPeng Mou
Apr 6, 2013·Chemical Society Reviews·Peter BalážKrystyna Wieczorek-Ciurowa
Oct 8, 2014·Journal of Environmental Sciences (China)·Kai ChengAijun Duan
Nov 13, 2018·Angewandte Chemie·Carsten Bolm, José G Hernández
Nov 24, 2019·The Science of the Total Environment·Zhiliang ChenJianhua Yan
Jan 29, 2020·The Science of the Total Environment·Fatemeh GholamiMohammadtaghi Vakili

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