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Sn、Ti掺杂改性γ-Fe2O3催化剂结构及NH3-SCR脱硝活性研究

王栋 ,  吴惊坤 ,  牛胜利 ,  路春美 ,  徐丽婷 ,  于贺伟 ,  李婧

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引用本文: 王栋, 吴惊坤, 牛胜利, 路春美, 徐丽婷, 于贺伟, 李婧. Sn、Ti掺杂改性γ-Fe2O3催化剂结构及NH3-SCR脱硝活性研究[J]. 燃料化学学报, 2015, 43(7): 876-883. shu
Citation:  WANG Dong, WU Jing-kun, NIU Sheng-li, LU Chun-mei, XU Li-ting, YU He-wei, LI Jing. Structural property of γ-Fe2O3 catalysts doped with Sn and Ti and their activity in the selective catalytic reduction of NOx[J]. Journal of Fuel Chemistry and Technology, 2015, 43(7): 876-883. shu

Sn、Ti掺杂改性γ-Fe2O3催化剂结构及NH3-SCR脱硝活性研究

    通讯作者: 路春美
  • 基金项目:

    国家自然科学基金(51276101) (51276101)

    高等学校博士学科点专项科研基金(20120131110022) (20120131110022)

    山东大学基本科研业务费专项资金(2015JC024)。 (2015JC024)

摘要: 采用共沉淀-微波热解法,制备一系列Sn、Ti掺杂改性γ-Fe2O3催化剂样品(γ-Fe0.95Ti0.05Oz、γ-Fe0.95Sn0.05Oz、γ-Fe0.95Sn0.025Ti0.025Oz),研究Sn、Ti掺杂对γ-Fe2O3催化剂SCR脱硝活性的影响,借助XRD、N2吸附-脱附、EDS及SEM等手段对催化剂晶相、孔结构、表面元素及微观形貌等进行表征分析。结果表明,Sn、Ti掺杂后以无定形态高度分散于γ-Fe2O3晶格中,与Fe形成固溶体;单一助剂Ti掺杂制得的γ-Fe0.95Ti0.05Oz 最高脱硝效率达98.3%,且在250~400 ℃脱硝效率保持90%以上;Ti掺杂可以细化γ-Fe2O3晶粒,优化2~100 nm孔径孔隙结构,抑制α-Fe2O3的生成,促使γ-Fe2O3形成细致、均匀、独立的球状颗粒,对SCR反应有利;Sn掺杂则使催化剂出现严重烧结现象,导致2~6 nm孔径孔结构贫乏,对SCR脱硝反应不利;在Sn、Ti协同作用下,催化剂表面氧铁原子物质的量比由1.83降至1.33,表面晶格氧显著下降,一定程度上限制了SCR反应速率的提高。

English

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  • 收稿日期:  2015-05-10
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