铁铈复合氧化物催化剂SCR脱硝的改性研究

熊志波; 路春美

铁铈复合氧化物催化剂SCR脱硝的改性研究

熊志波^1,2,
路春美^1,2,

1.
山东大学, 能源与动力工程学院, 山东济南 250061;
2.
山东大学, 燃煤污染物减排国家工程实验室, 山东济南 250061

基金项目: 国家自然科学基金(51276101);山东省自然科学基金(ZR2012EEM013)

详细信息

通讯作者:
路春美(1958- ),女,山东淄博人,博士,教授,研究方向为热能工程和环境工程,E-mail:cml@sdu.edu.cn。

中图分类号: TK16
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出版历程
- 收稿日期: 2012-08-05
- 修回日期: 2012-10-29
- 刊出日期: 2013-03-30

Study on the modification of iron-cerium mixed oxide catalyst for selective catalytic reduction of NO

XIONG Zhi-bo^1,2,
LU Chun-mei^{1,2
,}

1.
School of Energy and Power Engineering, Shandong University, Jinan 250061, China;
2.
National Engineering Laboratory for Coal-Burning Pollutants Emission Reduction, Shandong University, Jinan 250061, China

摘要

摘要: 利用共沉淀法制备了铁铈催化剂,考察添加钛、锆、钨和钼对其SCR脱硝的改性规律。结果表明,钨和钼的添加提高了铁铈催化剂高温脱硝性能,却使其低温活性有所降低;钛的添加对铁铈催化剂脱硝性能具有促进作用,尤其提高了其低温活性,并拓宽了其完全转化温度窗口,为最佳改性物。当钛的物质的量比逐渐由0.10增至0.40,铁铈钛催化剂低温脱硝效率先增大后减小,但其高温脱硝效率逐渐增大至100%,钛的最佳物质的量比为0.15。XRD和N₂吸附分析结果表明,钛能优化铁铈催化剂的孔隙结构,增大其比表面积和比孔容,细化其孔径,并与催化剂中铁、铈氧化物形成良好的固溶体,从而提高了铁铈催化剂的SCR脱硝性能。Fe_0.8Ce_0.05Ti_0.15O_z催化剂在150～400℃取得了高于90%的NO_x转化率。
- 铁铈复合氧化物催化剂 /
- 选择性催化还原脱硝 /
- NO_x /
- 钛 /
- 改性
Abstract: A series of iron-cerium mixed oxide catalysts modified titanium, zirconium, tungsten and molybdenum were prepared by co-precipitation. The selective catalytic reduction of NO_x with NH₃(NH₃-SCR) activity of the catalysts were carried out in a fixed-bed quartz tube reactor. The research results indicated that the addition of tungsten and molybdenum could increase the high-temperature NH₃-SCR activity of the iron-cerium mixed oxide catalysts, but decreased its low-temperature NH₃-SCR activity. Titanium could improve the NH₃-SCR activity of the iron-cerium mixed oxide catalyst within the range of reaction temperature, especially at low-temperature. Titanium was the most suitable assistant. When increasing the molar fraction of titanium from 0.10 to 0.40, the low-temperature NH₃-SCR activity of iron-cerium-titanium mixed oxide catalysts firstly increased and then decreased while the high-temperature activity gradually increased to 100%, and the optimum molar fraction of titanium was 0.15. The results of X-ray diffraction(XRD) and N₂ adsorption isotherms showed that the addition of titanium could optimize the pore structure of iron-cerium mixed oxide catalyst, and increased the BET surface and the pore volume of the iron-cerium mixed oxide catalyst, meanwhile refined its pore size. At the some cases, titanium could react with iron oxide and cerium oxide within the iron-cerium mixed oxide catalyst to form the solid solution. Therefore, the addition of titanium could enhance the NH₃-SCR activity of iron-cerium mixed oxide catalyst. Under the condition of the test, more than 90% of NO_x conversion could be achieved over Fe_0.8Ce_0.05Ti_0.15O_z catalyst at the temperature range of 150～400℃.
- iron-cerium mixed oxide catalyst /
- selective catalytic reduction(SCR) of NO /
- NO_x /
- titanium /
- modification

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