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The Effect of Cr Addition on Hg0 Oxidation and NO Reduction over V2O5/TiO2 Catalyst

Category: Control Techniques and Strategy

Volume: 18 | Issue: 3 | Pages: 803-810
DOI: 10.4209/aaqr.2017.10.0411
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Hao Song, Menglei Zhang, Jinpin Yu, Weihong Wu, Ruiyang Qu, Chenghang Zheng, Xiang Gao

  • State Key Laboratory of Clean Energy Utilization, State Environmental Protection Center for Coal-Fired Air Pollution Control, Zhejiang University, Hangzhou, Zhejiang 310027, China

Highlights

The V/Ti catalysts doped with Cr are prepared by impregnation method.
The catalysts show excellent activity on both Hg0 oxidation and NO conversion.
The performance of Hg0 oxidation with a low concentration of HCl is enhanced.


Abstract

A series of V2O5-Cr2O3/TiO2 catalysts with various chromium loadings prepared by the impregnation method were studied for Hg0 oxidation and NO reduction. The results indicate that Cr2O3-modified V2O5/TiO2 exhibited improved catalytic activity for both Hg0 oxidation and NO reduction. In fact, with the addition of 5% Cr2O3 to the V/Ti catalyst, the mercury oxidation efficiency increased significantly from 6.5% to 97% in the presence of O2 at 350°C, and its SCR performance also improved in the temperature range of 250°C to 400°C. To explore the effect of individual flue gas components on Hg0 oxidation, a series of activity tests were conducted over 1% Cr-V/Ti at 350°C, and it was found that O2 and HCl promote mercury oxidation, while SO2 and H2O exhibited a somewhat inhibitive influence. H2-TPR and XPS results indicated that the enhanced catalytic performance of V2O5-Cr2O3/TiO2 is attributable to the synergetic interactions between the two active phases.

Keywords

Mercury oxidation NH3-SCR V2O5/TiO2 Cr2O3


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