钒前驱体对V-OMS-2结构及催化CO氧化活性的影响  

Effect of vanadium precursors on the structure and catalytic activity of V-OMS-2 for CO oxidation

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作  者:汤清虎[1] 郭晓慧 谢小培[1] 赵培正[1] Tang Qinghu;Guo Xiaohui;Xie Xiaopei;Zhao Peizheng(School of Chemistry and Chemical Engineering,Henan Normal University,Xinxiang 453007,China)

机构地区:[1]河南师范大学化学化工学院,河南新乡453007

出  处:《河南师范大学学报(自然科学版)》2022年第4期28-35,共8页Journal of Henan Normal University(Natural Science Edition)

基  金:国家自然科学基金(21503070);河南省教育厅科学技术研究重点项目(19A150030)。

摘  要:采用简单、低成本回流法制备了未掺杂和不同钒前驱体掺杂V的OMS-2催化剂,考察了其对CO低温氧化的催化活性,并借助XRD,FT-IR,BET,TEM,XPS,TGA和H_(2)-TPR表征技术研究了催化剂的结构、形貌、键态、价态及氧化还原性能.V掺杂改变了OMS-2骨架中锰氧八面体配位氧的配位环境,使OMS-2的形貌发生了显著变化,增加了结构缺陷,加强了表面活性氧的机动性和反应性,使其呈现出远高于未掺杂OMS-2的催化活性.与NaVO_(3)前驱体相比,以V_(2)O_(5)为前驱体掺杂V制备的3%V-OMS-2(1)具有更高的催化活性,可将CO完全燃烧温度从未掺杂OMS-2的200℃降至50℃以下.较大比表面积、特有的孔结构、短纳米棒形貌以及更机动、活泼的表面活性氧是3%V-OMS-2(1)呈现出高CO氧化活性的重要原因.Undoped and V doped OMS-2 with different V precursors were prepared by a simple and low-cost reflux method,and their catalytic activities for CO oxidation at low temperature were studied.XRD,FT-IR,BET,TEM,XPS,TGA and H_(2)-TPR techniques were employed to characterize the structure,morphology,bond state,valence state and redox performance of the synthesized catalysts.V doping changed the coordination environment of octahedral oxygen in the skeleton of OMS-2,leading to a significant change in the morphology of OMS-2,increased structural defects,enhanced the mobility and reactivity of oxygen species on the surface,thus made them show much higher catalytic activity than undoped OMS-2.Compared with NaVO_(3)as the V precursor,3%V-OMS-2(1)synthesized with V_(2)O_(5)as the V precursor exhibited much higher catalytic activity and it could reduce the temperature of the total combustion of CO from 200℃to lower than 50℃.Large specific surface area,unique pore structure,shorter nanorod morphology and more mobile and active surface oxygen species accounted for the high CO oxidation activity of the 3%V-OMS-2(1).

关 键 词:锰氧八面体分子筛 钒前驱体 掺杂 CO氧化 

分 类 号:O643[理学—物理化学]

 

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