二氧化钛纳米管负载MnOx-CeO2催化剂在低温条件下NH3选择性催化还原NOx的活性和SO2/H2O耐受性增强

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL Catalysis Surveys from Asia Pub Date : 2022-03-16 DOI:10.1007/s10563-022-09356-w
Zhuping Jiang, Qiulin Wang, Yuzhou Cai
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引用次数: 5

摘要

为了实现低温NH3-SCR技术的广泛应用,迫切需要一种具有高催化活性和较强低温抗中毒性能的环保型选择性催化还原(SCR)催化剂。选择合适的载体是提高SCR催化剂的催化活性和抗中毒能力的重要措施之一。采用浸渍法制备了传统二氧化钛(MnCe/TiO2)和钛酸盐纳米管(MnCe/TiNTs)负载的氧化锰-氧化铈,并在有或无SO2的烟气中评价了它们对NH3-SCR的催化活性;H2O。结果表明,将P25 TiO2在130℃下水热处理24 h,可以得到形貌和微观结构最优的TiNTs。在TiNTs上负载MnOx-CeO2复合材料不仅提高了低温催化活性,而且提高了N2选择性,拓宽了催化剂的活性温度窗。主要原因是TiNTs具有较大的比表面积和独特的空心管状结构,有利于催化活性组分在TiNTs的内外壁上高度分散,从而丰富了表面酸位和表面活性氧,实现低温SCR反应循环。此外,TiNTs显著提高了SO2 &催化剂的耐水性,减轻了SO2、H2O与反应物之间的竞争性吸附,使MnCe/TiNTs催化剂上的硫酸铵或硫酸氢铵的沉积更加困难。此外,TiNTs的约束效应使部分毒物被困在TiNTs的管状通道内。这样就可以保护分布在tint外壁的活性成分不受毒害。
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Enhanced Catalytic Activity and SO2/H2O Tolerance for Selective Catalytic Reduction of NOx with NH3 over Titanate Nanotubes Supported MnOx–CeO2 Catalyst at Low Temperature

An environment-friendly selective catalytic reduction (SCR) catalyst with high catalytic activity and strong anti-poisoning performance at low temperature is strongly needed to achieve the wide application of low temperature NH3-SCR technology. Selection of appropriate carrier is one of the most important measures to improve catalytic activity as well as anti-poisoning capability of SCR catalyst. Manganese oxide-cerium oxide supported on traditional titanium dioxide (denoted as MnCe/TiO2) and titanate nanotubes (denoted as MnCe/TiNTs) were prepared by impregnation method and their catalytic activities towards NH3-SCR of NO were evaluated in flue gas with or without SO2 & H2O. The results indicate that TiNTs with optimum morphology and microstructure can be obtained when P25 TiO2 is hydrothermally treated at 130 °C for 24 h. Supporting MnOx–CeO2 composite on TiNTs not only enhances the catalytic activity at low temperature, but also improves N2 selectivity and widens active temperature window of catalyst. The main reason is the large specific surface area as well as the unique hollow tubular structure of TiNTs facilitates high dispersion of catalytic active components on the inner and outer walls of TiNTs, which enriches surface acid sites and surface reactive oxygen species to fulfill low temperature SCR reaction cycle. Moreover, TiNTs significantly enhances the SO2 & H2O tolerance of catalyst, for the competitive adsorption between SO2, H2O and reactants is alleviated and the deposition of ammonium sulphate or ammonium bisulphate becomes more difficult on MnCe/TiNTs catalyst. Besides, the confinement effect of TiNTs makes partial toxicants be trapped inside the tubular channel of TiNTs. So that protects the active components, which are distributed on the out wall of TiNTs, from being poisoned.

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来源期刊
Catalysis Surveys from Asia
Catalysis Surveys from Asia 化学-物理化学
CiteScore
4.80
自引率
0.00%
发文量
29
审稿时长
>12 weeks
期刊介绍: Early dissemination of important findings from Asia which may lead to new concepts in catalyst design is the main aim of this journal. Rapid, invited, short reviews and perspectives from academia and industry will constitute the major part of Catalysis Surveys from Asia . Surveys of recent progress and activities in catalytic science and technology and related areas in Asia will be covered regularly as well. We would appreciate critical comments from colleagues throughout the world about articles in Catalysis Surveys from Asia . If requested and thought appropriate, the comments will be included in the journal. We will be very happy if this journal stimulates global communication between scientists and engineers in the world of catalysis.
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