xCeO2-yWO3-TiO2脱硝催化剂的制备与性能

doi:10.12068/j.issn.1005-3026.2019.12.009

东北大学学报:自然科学版 ›› 2019, Vol. 40 ›› Issue (12): 1716-1720.DOI: 10.12068/j.issn.1005-3026.2019.12.009

xCeO₂-yWO₃-TiO₂脱硝催化剂的制备与性能

边雪，胡吕，彭朋，刘思洋

(东北大学冶金学院，辽宁沈阳110819)

收稿日期:2019-01-30 修回日期:2019-01-30 出版日期:2019-12-15 发布日期:2019-12-12
通讯作者: 边雪
作者简介:边雪(1980-)，男，辽宁沈阳人，东北大学副教授，博士.
基金资助:
国家自然科学基金资助项目(51774070).

Preparation and Properties of xCeO₂-yWO₃-TiO₂ Denitration Catalyst

BIAN Xue， HU Lyu， PENG Peng， LIU Si-yang

School of Metallurgy， Northeastern University， Shenyang 110819， China.

Received:2019-01-30 Revised:2019-01-30 Online:2019-12-15 Published:2019-12-12
Contact: BIAN Xue
About author:-
Supported by:
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摘要/Abstract

摘要： 我国面临着大气污染物氮氧化物排放限制要求，以及商业催化剂(V₂O₅-WO₃/TiO₂)危废处理困难等问题.以工业偏钛酸为钛源，采用共沉淀法制备了xCeO₂-yWO₃/TiO₂催化剂，研究了活性组分Ce，W含量对催化剂脱硝效率的影响，其中30Ce4W催化剂脱硝率90%和95%的温度区间最宽分别达到了310℃和285℃.采用XRD，XPS，BET，NH₃-TPD，H₂-TPR等测试方法对催化剂结构及脱硝性能机理进行表征.结果表明，30Ce4W催化剂表面较高的Ce⁴⁺占比和化学吸附氧含量、较高的比表面积有利于提高脱硝性能，且该催化剂表面氧化物更容易被还原并对NH₃的吸附能力较大，因此其脱硝效果最佳.

关键词: NH₃-SCR, CeO₂-WO₃/TiO₂, 烟气脱硝, 偏钛酸, 共沉淀法

Abstract: Our country is facing the emission limitation of nitrogen oxide and the difficulty in handling dangerous waste of commercial catalyst (V₂O₅-WO₃/TiO₂). We propose a novel method of preparing xCeO₂-yWO₃/TiO₂ catalysts by impregnation-thermal decomposition. The effects of active component contents Ce and W on denitration efficiency were studied. Catalyst 30Ce4W reaches the widest temperature range 310℃ and 285℃， with a denitration efficiency 90% and 95%， respectively. The structure and mechanism of the catalysts were characterized by XRD， XPS， BET， NH₃-TPD and H₂-TPR. The results showed that for catalyst 30Ce4W， the higher ratio of Ce⁴⁺ and chemisorbed oxygen content on the surface and the higher specific surface area were conducive to improving the denitration performances. The oxides on the surface were reduced readily and exhibited a great adsorption capacity for NH₃. Thus its denitration effect was superior to other catalysts.

Key words: NH₃-SCR, CeO₂-WO₃/TiO₂, flue gas denitration, metatitanic acid, coprecipitation method

中图分类号:

TF845

边雪，胡吕，彭朋，刘思洋. xCeO₂-yWO₃-TiO₂脱硝催化剂的制备与性能[J]. 东北大学学报:自然科学版, 2019, 40(12): 1716-1720.

BIAN Xue， HU Lyu， PENG Peng， LIU Si-yang. Preparation and Properties of xCeO₂-yWO₃-TiO₂ Denitration Catalyst[J]. Journal of Northeastern University Natural Science, 2019, 40(12): 1716-1720.

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xCeO₂-yWO₃-TiO₂脱硝催化剂的制备与性能

Preparation and Properties of xCeO₂-yWO₃-TiO₂ Denitration Catalyst

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