铁铈复合氧化物催化剂SCR脱硝的改性研究

引用本文: 熊志波, 路春美. 铁铈复合氧化物催化剂SCR脱硝的改性研究[J]. 燃料化学学报, 2013, 41(3): 361-367. shu

Citation: XIONG Zhi-bo, LU Chun-mei. Study on the modification of iron-cerium mixed oxide catalyst for selective catalytic reduction of NO[J]. Journal of Fuel Chemistry and Technology, 2013, 41(3): 361-367. shu

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,
,}

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。

基金项目:
国家自然科学基金(51276101) (51276101)

山东省自然科学基金(ZR2012EEM013) (ZR2012EEM013)

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。

关键词:

English

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.
1. School of Energy and Power Engineering, Shandong University, Jinan 250061, China;

Corresponding author: 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。

Received Date: 05 August 2012
Fund Project:
国家自然科学基金(51276101)

山东省自然科学基金(ZR2012EEM013)

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℃.

Key words:

iron-cerium mixed oxide catalyst
/ selective catalytic reduction(SCR) of NO
/ NO_x
/ titanium
/ modification

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

铁铈复合氧化物催化剂SCR脱硝的改性研究

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。

English

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

Corresponding author: 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。

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

铁铈复合氧化物催化剂SCR脱硝的改性研究

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。

English

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

Corresponding author: 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。

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

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