Effect of molybdenum on mercury oxidized by V2O5-MoO3/TiO2 catalysts

被引：39

作者：

Zhao, Bo ^{[1
]}

Liu, Xiaowei ^{[1
]}

Zhou, Zijian ^{[1
]}

Shao, Haizhong ^{[1
]}

Wang, Chao ^{[1
]}

Si, Junping ^{[1
]}

Xu, Minghou ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2014年 / 253卷

基金：

中国国家自然科学基金;

关键词：

Mercury; SCR; V2O5-MoO3/TiO2; Mars-Maessen mechanism; VANADIA-TITANIA CATALYSTS; ELEMENTAL MERCURY; COAL-COMBUSTION; REDUCTION SCR; HYDROCHLORIC-ACID; PILOT-SCALE; OXIDATION; CONVERSION; REMOVAL; NO;

D O I：

10.1016/j.cej.2014.05.071

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A detail process of sol-gel method was introduced to prepare V2O5-MoO3/TiO2 catalyst powders containing different quantities of vanadium pentoxide and molybdenum trioxide in this study. Powder for the application in these SCR catalysts for mercury oxidation was tested in laboratory for the first time. The results indicated that titanium-vanadium-molybdenum catalysts are of higher mercury oxidation efficiency than titanium-vanadium catalysts. Especially the V2O5-MoO3/TiO2 catalyst contained 5 wt% vanadium pentoxide and 5 wt% molybdenum trioxide (TV5M5), even with only the present of 6% O-2, it still performed a strong mercury oxidation ability. Elemental mercury oxidized by V2O5-MoO3/TiO2 catalysts was found to follow the Mars-Maessen mechanism. Molybdenum trioxide could not directly oxidize Hg-0, but molybdenum in high valence could assist to oxidize vanadium in low valence to increase the number of lattice oxygen for mercury oxidation according to the X-ray photoelectron spectroscopy results. In addition, HCl exhibited a promotional effect on mercury oxidation across TV5M5, the concentration of oxidized mercury escaped from the catalyst surface increased as the content of HCl introduced into the 6% O-2/N-2 atmosphere increasing. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：508 / 517

页数：10

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