Research on the catalytic oxidation of Hg<sup>0</sup> by modified SCR catalysts

ZHAO Li; HE Qing-song; LI Lin; LU Qiang; DONG Chang-qing; YANG Yong-ping

Volume 43 Issue 05

May 2015

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Article Navigation > Journal of Fuel Chemistry and Technology > 2015 > 43(05): 628-634

ZHAO Li, HE Qing-song, LI Lin, LU Qiang, DONG Chang-qing, YANG Yong-ping. Research on the catalytic oxidation of Hg0 by modified SCR catalysts[J]. Journal of Fuel Chemistry and Technology, 2015, 43(05): 628-634.

Citation:

ZHAO Li, HE Qing-song, LI Lin, LU Qiang, DONG Chang-qing, YANG Yong-ping. Research on the catalytic oxidation of Hg⁰ by modified SCR catalysts[J]. Journal of Fuel Chemistry and Technology, 2015, 43(05): 628-634.

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Research on the catalytic oxidation of Hg⁰ by modified SCR catalysts

National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China

Received Date: 2015-01-08
Publish Date: 2015-05-30

Abstract

Abstract

A series of metal oxides were employed to modify the commercial SCR catalyst, and the Ce modified SCR catalyst was selected and then subjected to detailed catalytic oxidation of Hg⁰ by using the simulated flue gas. The results indicated that the catalytic activity of the catalyst was increased remarkably after the Ce modification, and the highest catalytic oxidation of Hg⁰ was obtained from the modified SCR catalyst with 9% Ce loading, being 40% higher than that of the non-modified SCR catalyst. The BET and XRD analysis indicated that the surface area of the 1%~9% Ce modified SCR catalyst was no significant change compared with the non-modified SCR catalyst, and the CeO₂ was well dispersed on the catalyst surface, without any aggregation. The flue gas condition had great effects on the Hg⁰ conversion. The catalytic oxidation of Hg⁰ would be significantly increased by HCl, and also increased as the increasing of the temperature in a certain range. The highest catalytic oxidation efficiency reached 95.11% at the optimal space velocity, temperature and flue gas components. In addition, the CeO₂ doping did not affect the denitration efficiency of the SCR catalyst.
- modified SCR catalyst,
- Hg⁰,
- catalytic oxidation

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References

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