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首页> 外文期刊>Journal of Materials Science >Characterization and catalytic performance of vanadium supported on sulfated Ti-PILC catalysts issued from different Ti-precursors in selective catalytic reduction of nitrogen oxide by ammonia
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Characterization and catalytic performance of vanadium supported on sulfated Ti-PILC catalysts issued from different Ti-precursors in selective catalytic reduction of nitrogen oxide by ammonia

机译：不同前驱体发出的硫酸化Ti-PILC催化剂上负载的钒在氨选择性催化还原氮氧化物中的表征及催化性能

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Vanadium supported on sulfated Ti-pillared clay catalysts (STi-PILCs) issued from different Ti-precursors were investigated for selective catalytic reduction (SCR) of NO by NH3 in the presence of O-2. The STi-PILCs supports were prepared by hydrolysis of a series of organic or inorganic Ti-precursors; Ti(OCH3)(4), Ti(OC2H5)(4), and TiCl4 with H2SO4, and then modified with vanadium introduced by impregnation method. The unpromoted and promoted vanadium pillared clays were characterized using chemical analysis, N-2-physisorption, NH3-TPD, H-2-TPR, and tested for SCR of NO by NH3. It was found that the textural and acidic properties of the STi-PILC materials are influenced by the nature of the Ti-precursor; and the use of Ti-methoxide allows the synthesis of STi-PILC with the highest acidity. The presence of vanadium on STi-PILC supports reduces their surface areas and porous volumes, creates new redox sites, and enhances the reducibility of the sulfate groups leading to better redox properties of the binary V-STi-PILCs. After vanadium addition, the STi-PILC materials issued from Ti(OCH3)(4), exhibited higher NO reduction activity at high temperature. These results underline the importance of the Ti-precursor for the preparation of the STi-PILC support, and the role of vanadium to increase the redox properties of V-STi-PILC catalyst for the SCR of NO by NH3.
机译：研究了在不同O 2存在下，由不同Ti前驱体发出的硫酸化Ti柱状粘土催化剂（STi-PILC）上负载的钒对NO选择性催化还原（SCR）NO的作用。 STi-PILCs载体是通过水解一系列有机或无机Ti前体制备的;将Ti（OCH3）（4），Ti（OC2H5）（4）和TiCl4用H2SO4混合，然后用浸渍法引入的钒进行改性。使用化学分析，N-2-物理吸附，NH3-TPD，H-2-TPR对未促进和促进的钒柱状粘土进行表征，并测试NH3对NO的SCR。发现STi-PILC材料的质构和酸性受钛前体的性质影响;使用甲醇钛可以合成最高酸度的STi-PILC。 STi-PILC上钒的存在减少了其表面积和多孔体积，创建了新的氧化还原位点，并增强了硫酸根的还原性，从而导致二元V-STi-PILC具有更好的氧化还原特性。加入钒后，由Ti（OCH3）（4）发出的STi-PILC材料在高温下表现出更高的NO还原活性。这些结果强调了Ti前体对于制备STi-PILC载体的重要性，以及钒在增加V-STi-PILC催化剂对NH 3的SCR的氧化还原性能中的作用。

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