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NOx removal by selective catalytic reduction with ammonia over hydrotalcite-derived NiTi mixed oxide

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Abstract

Herein, a series of NiTi-LDHs were synthesized, calcined and tested in the removal of NOx by selective catalytic reduction with NH3 (NH3-SCR). Appropriate calcination temperatures as well as Ni/Ti molar ratios of LDH precursors were systematically identified to achieve optimal catalysis; the results pronouncedly affirmed that the catalytic performances of the as-acquired catalysts were vulnerable to the calcination temperature and Ni/Ti molar ratios, where the Ni4Ti1-400 catalyst presented optimal DeNOx activity (over 90% NOx conversion with nearly 95% N2 selectivity in the region of 240–360 °C), SO2 resistance and stability. Multiple characterization techniques revealed that the excellent catalytic performance of Ni4Ti1-400 could be attributed to the favorable interaction between the Ni and Ti species, consequently resulting in higher specific surface area, enhanced acidity, increased content of the surface Ni3+ species, and improved cycle reactions of NH3-SCR.

Graphical abstract: NOx removal by selective catalytic reduction with ammonia over hydrotalcite-derived NiTi mixed oxide

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Publication details

The article was received on 17 Oct 2018, accepted on 06 Jan 2019 and first published on 07 Jan 2019


Article type: Paper
DOI: 10.1039/C8NJ05280H
Citation: New J. Chem., 2019, Advance Article
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    NOx removal by selective catalytic reduction with ammonia over hydrotalcite-derived NiTi mixed oxide

    X. Wu, R. Wang, Y. Du, X. Li, H. Meng and X. Xie, New J. Chem., 2019, Advance Article , DOI: 10.1039/C8NJ05280H

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