Influence of tungsten on the activity of a Mn/Ce/W/Ti catalyst for the selective catalytic reduction of NO with NH3 at low temperatures

被引：113

作者：

Kwon, Dong Wook ^{[1
]}

Nam, Ki Bok ^{[1
]}

Hong, Sung Chang ^{[1
]}

机构：

[1] Kyonggi Univ, Grad Sch, Dept Environm Energy Engn, Suwon, Gyeonggi Do, South Korea

来源：

APPLIED CATALYSIS A-GENERAL | 2015年 / 497卷

关键词：

Low-temperature SCR; MnOx; CeO2; Tungsten effect; Mn/Ce/W/Ti; MANGANESE OXIDE CATALYSTS; DOPED CEO2-WO3 CATALYSTS; MIXED OXIDES; NITRIC-OXIDE; SCR; MN; CU; MNOX/TIO2; MN/TIO2; OXYGEN;

D O I：

10.1016/j.apcata.2015.01.013

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of tungsten in the Mn/Ce/W/Ti catalyst system on the activity and SO2 induced deactivation of the catalyst was evaluated. The properties of the catalyst were evaluated using physicochemical measurements, including Brunauer-Emmett-Teller (BET) surface area, X-ray photoelectron spectroscopy (XPS), NH3 temperature-programmed desorption (TPD), X-ray diffraction (XRD), and H-2 temperature-programmed reduction (H-2-TPR) analyses. The Mn4+ ratio increased with the addition of Ce and W to the Mn/Ti system. The Mn/Ce/W/Ti catalyst, prepared by controlling the Mn4+ ratio through the addition of Ce and W to Mn/Ti, exhibited excellent activity in the range of 120-200 degrees C. The catalyst efficiency was positively correlated with NH3 adsorption. The catalytic activity and surface area of the Mn/Ce/5W/Ti catalyst (containing 5 wt% tungsten) were optimal, but decreased at higher tungsten loadings. Increasing the Ce3+ ratio in Mn/Ce/W/Ti increased the selective catalytic reduction (SCR) activity. Mn/Ti and Mn/Ce/Ti were rapidly deactivated upon the injection of SO2 in the SCR reaction. However, the Mn/Ce/5W/Ti catalyst exhibited excellent resistance to SO2 induced deactivation. Thus, the addition of tungsten to Mn/Ce/Ti resulted in excellent NO conversion and SO2 resistance. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：160 / 166

页数：7

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