Activity and antitoxic properties of Cr-MnOx/TiO2-ZrO2 for low-temperature selective catalytic reduction of NO

被引：0

作者：

Li, Zhe ^{[1
]}

Wang, Li ^{[1
,2
]}

Yun, Li ^{[1
]}

Wang, Zhen-Nan ^{[1
]}

Li, Meng-Xia ^{[1
]}

Li, Xin ^{[1
]}

机构：

[1] School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing

[2] Key Laboratory of the Ministry of Education for High Efficient Mining and Safety in Metal Mines, University of Science and Technology Beijing, Beijing

来源：

Gongcheng Kexue Xuebao/Chinese Journal of Engineering | 2015年 / 37卷 / 08期

关键词：

Activity; Catalysts; Nitrogen oxide; Oxides; Selective catalytic reduction;

D O I：

10.13374/j.issn2095-9389.2015.08.012

中图分类号：

学科分类号：

摘要：

Using a sol-gel prepared TiO2-ZrO2 carrier, Cr-MnOx/TiO2-ZrO2 composite catalysts were synthesized by a critic acid solution impregnation method. The physical and chemical properties of the catalysts were characterized by X-ray diffraction, specific surface area determination (BET), scanning electron microscopy and X-ray photoelectron spectroscopy. Meanwhile, the low-temperature catalytic activity and the sulfur and water resistance were evaluated with selective catalytic reduction (SCR) of NO by NH3. The introduction of Cr element to MnOx yields a new CrMn1.5O4 active phase, in which Mn primarily exists as Mn3+ and Mn4+. The Cr5+ valence state facilitates the transformation of Mn3+ to high oxidation state Mn4+, which is beneficial to the low temperature SCR reaction. Because of lower first ionization energy and electronegativity, Cr preferentially reacts with SO42- and SO32- than Mn, thus protecting MnOx not to be sulphatized and resulting in the enhanced antitoxic performance of Cr-MnOx/TiO2-ZrO2. Among the prepared five catalysts with different molar ratios of Cr/(Cr+Mn), Cr(0.4)-MnOx/TiO2-ZrO2 demonstrates the best performance owing to the largest surface area and the best particle dispersion, and a 95.8% denitrification efficiency can be achieved at 180℃. When 5% H2O and 10-4 SO2 are simultaneously added, the denitrification efficiency decreases slowly and stabilizes at 73% after 8 h reaction. © Copyright.

引用

页码：1049 / 1056

页数：7

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