SiO2改性的V2O5-MoO3/ TiO2催化剂抗碱中毒性能研究

沈伯雄; 马娟

SiO₂改性的V₂O₅-MoO₃/ TiO₂催化剂抗碱中毒性能研究

沈伯雄,
马娟

南开大学环境科学与工程学院, 天津 300071

基金项目: 国家自然科学基金(50976050,51176077);环保公益性行业科研专项经费(201109004)。

详细信息

中图分类号: O643.36⁺2
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出版历程
- 收稿日期: 2011-02-19
- 修回日期: 2011-06-03
- 刊出日期: 2012-02-29

Alkali-resistant performance ofV₂O₅-MoO₃/ TiO₂ catalyst modified by SiO₂

College of Environmental Science &|Engineering, Nankai University, Tianjin 300071, China

摘要

摘要: 以陶瓷为骨架,用溶胶凝胶法和浸渍法制备了V₂O₅-MoO₃/ TiO₂催化剂,并用SiO₂进行改性。采用浸渍法模拟碱K中毒,研究了SiO₂改性前后催化剂中毒脱硝效率的变化,并通过BET、H₂-TPR、NH₃-TPD等技术手段对催化剂进行了表征。结果表明,加入SiO₂后,催化剂的比表面积明显提高。SiO₂改性后新鲜催化剂还原温度向低温方向迁移10 ℃左右,氧化还原能力得到了提高,其表面酸强度和酸量也得到较大的提高。反应评价结果表明,SiO₂改性可以提高催化剂抗碱中毒的性能。
- 选择性催化还原 /
- V₂O₅-MoO₃/ TiO₂ /
- SiO₂改性 /
- 碱中毒 /
- 氮氧化物脱除
Abstract: V₂O₅-MoO₃/ TiO₂catalyst was prepared by sol-gel and impregnation method and modified with SiO₂ to improve its alkali-resistant performance. The alkali poisoning was simulated by the immersion of the catalyst in alkali salt solution. The effect of SiO₂ modification on the de-NO_xactivity of V₂O₅-MoO₃/ TiO₂ catalyst in the selective catalytic reduction was investigated. BET, H₂-TPR and NH₃-TPD measurements indicated that the specific surface area, the redox ability (the reduction temperature is decreased by 10 ℃) and the acidity of the SiO₂-modified V₂O₅-MoO₃/TiO₂catalyst are increased obviously. As a result, the alkali-resistant performance of V₂O₅-MoO₃/ TiO₂ catalyst was improved largely by the SiO₂ modification.
- selective catalytic reduction /
- V₂O₅-MoO₃/ TiO₂ /
- SiO₂ modification /
- alkali poisoning /
- de-NO_x

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参考文献(20)

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