Issue 12, 2019

Enhancing low-temperature SCR de-NOx and alkali metal poisoning resistance of a 3Mn10Fe/Ni catalyst by adding Co

Abstract

Alkaline K poisoned and Co-modified catalysts were prepared using Fe and Mn as active components, nickel foam as a carrier, and Co as a trace additive. The de-NOx performance of the 3Mn10Fe/Ni catalyst under alkaline K poisoning conditions and the effect of Co modification on K resistance were studied. The results show that after the addition of K, the synergistic effect between Ni and Mn/Fe weakens, and the redox capability decreases, due to the decrease in NiO/Ni, Fe3+, Mn4+, lattice oxygen ratio, unsaturated Ni atom content on the catalyst surface and structure defects of Ni–Mn/Fe composite oxides. Brønsted acid sites decrease significantly, which decreases the low temperature de-NOx activity of the catalyst. The NiO/Ni ratio, Fe3+, Mn4+, and lattice oxygen content increase after Co modified the 0.3K3Mn10Fe/Ni catalyst. The synergistic effect between Ni and Mn/Fe increases, and the redox capability is also promoted. Owing to the significant increase in Brønsted acid sites, the K poisoning resistance of the 3Mn10Fe/Ni catalyst also increases dramatically. When the Co addition amount is 0.2%, the optimal K resistance property of the 3Mn10Fe/Ni catalyst was achieved, and its de-NOx activity reached 98% at 220 °C.

Graphical abstract: Enhancing low-temperature SCR de-NOx and alkali metal poisoning resistance of a 3Mn10Fe/Ni catalyst by adding Co

Article information

Article type
Paper
Submitted
01 Apr 2019
Accepted
18 May 2019
First published
20 May 2019

Catal. Sci. Technol., 2019,9, 3214-3225

Enhancing low-temperature SCR de-NOx and alkali metal poisoning resistance of a 3Mn10Fe/Ni catalyst by adding Co

B. Zhu, Z. Zi, Y. Sun, Q. Fang, J. Xu, W. Song, H. Yu and E. Liu, Catal. Sci. Technol., 2019, 9, 3214 DOI: 10.1039/C9CY00599D

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