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机构地区:[1]哈尔滨工程大学教育部超轻材料与表面技术重点实验室材料科学与化学工程学院,黑龙江哈尔滨150001
出 处:《燃料化学学报》2014年第12期1455-1463,共9页Journal of Fuel Chemistry and Technology
基 金:Supported by Fundamental Research Funds for Central Universities(HEUCF201403002);Advanced Technique Project Funds of the Manufacture and Information Ministry
摘 要:采用调节前驱体溶液pH值的方法制备了用于低温NH3-SCR的V2O5-WO3/Ti O2催化剂。通过XPS、Raman光谱、H2-TPR、NH3-TPD、NH3-DRIFT、XRD及物理吸附等手段对催化剂进行了表征分析,并对其脱硝催化活性进行了测试。结果表明,前驱体溶液酸性的增强能够提高催化剂表面聚合态钒物种和V4+(3+)/V5+的比值以及表面酸性,增加活性位数量、降低反应的活化能、提高其脱硝催化性能。因此,通过提高前驱体溶液的酸性,有助于制备出脱硝活性较好的NH3-SCR催化剂。V2O5-WO3/TiO2 catalyst for the selective catalytic reduction of NOx with NH3(NH3-SCR) was prepared through wet impregnation and characterized by XPS, Raman spectra, H2-TPR, NH3-TPD, NH3-DRIFT, XRD and physical adsorption.The effect of the pH value of vanadium precursor solution on the catalytic performance of V2 O5-WO3/TiO2 in the low temperta ure NH3-SCR of NOx was investigated to optimize the preparation conditions.The resutl s indicated that with the enhancement of precursor solution acidity, more polymeric vanadium species are formed on the catalyst surface;meanwhile, the ratio of V4+(3+)/V5+, surface acidity, and quantity of active sites are increased, whereas the de-NOx performance of the V2 O5-WO3/TiO2 catalyst is largely improved.As a result, a V2 O5-WO3/TiO2 catalyst with high performance in de-NOx through NH3-SCR can be obtained by enhancing the precursor solution acidity in the preparation process.
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