The Effect of Cr Addition on Hg^0 Oxidation and NO Reduction over V_2O_5/TiO_2 Catalyst

Hao Song ； Menglei Zhang ； Jinpin Yu ； Weihong Wu ； Ruiyang Qu ； Chenghang Zheng ； Xiang Gao

《Aerosol and Air Quality Research》 18卷3期 (2018/03) Pp. 803-810+ap1

https://doi.org/10.4209/aaqr.2017.10.0411

摘要

A series of V_2O_5-Cr_2O_3/TiO_2 catalysts with various chromium loadings prepared by the impregnation method were studied for Hg^0 oxidation and NO reduction. The results indicate that Cr_2O_3-modified V_2O_5/TiO_2 exhibited improved catalytic activity for both Hg^0 oxidation and NO reduction. In fact, with the addition of 5% Cr_2O_3 to the V/Ti catalyst, the mercury oxidation efficiency increased significantly from 6.5% to 97% in the presence of O_2 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 Hg^0 oxidation, a series of activity tests were conducted over 1% Cr-V/Ti at 350°C, and it was found that O_2 and HCl promote mercury oxidation, while SO_2 and H_2O exhibited a somewhat inhibitive influence. H_2-TPR and XPS results indicated that the enhanced catalytic performance of V_2O_5-Cr_2O_3/TiO_2 is attributable to the synergetic interactions between the two active phases.

關鍵字

Mercury oxidation ； NH_3-SCR ； V_2O_5/TiO_2 ； Cr_2O_3