Journal of Materials Science

, Volume 53, Issue 13, pp 9674–9689 | Cite as

Study of the alkali metal poisoning resistance of a Co-modified Mn/Ni foam catalyst in low-temperature flue gas SCR DeNO x

Energy materials
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Abstract

A Co–Mn/Ni foam catalyst and alkali metal K-poisoned catalyst were prepared by an impregnation method using foamed Ni metal as a carrier. Mn was the active component, and Co was a trace auxiliary. The effects of different levels of alkali metal K poisoning and different concentrations of Co auxiliaries on the K poisoning resistance of the catalyst were studied. The results showed that the number of Brønsted acid sites on the surface of the catalyst, the reduction capacity and the number of unsaturated Ni atoms decreased after the addition of K. The interaction between the active Mn and the metallic Ni decreased, and the activity of the catalyst decreased. As the addition amount of added K increased, the catalyst alkali metal poisoning phenomenon became more significant. The kinetic studies showed that the activation energy increased after the addition of K, whereas the activation energy of K0.3Co0.5/Fresh catalyst decreased after Co modification. The amounts of Brønsted acid and Lewis acid sites on the surface of the K-poisoned catalyst were improved dramatically by Co modification of the Mn/Ni foam catalyst. K destroys the extremely important Brønsted acid sites that adsorb and activate NH3, reducing the performance to less than half. Additionally, NH3-TPD and in situ DRIFT analyses showed that Co, K, Mn and Ni synergistically improved the acid sites. The number of Brønsted acid sites and Lewis acid sites on the catalyst surface were greatly increased in the K0.3Co0.5/Fresh catalyst, whose reduction performance increased substantially compared with the K0.3/Fresh catalyst.

Notes

Acknowledgments

This work was supported 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 the Anhui province university outstanding youth talent support program (Nos. gxyqZD2016074 and gxyqZD2017038), the Funding Projects of Back-up Candidates (No. 2017H131) and the Anhui Provincial Education Foundation (No. KJ2016A090).

Compliance with ethical standards

Conflict of interest

The authors declare no competing financial interest.

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Authors and Affiliations

  1. 1.School of Energy and EnvironmentAnhui University of TechnologyMaanshanPeople’s Republic of China

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