TiO2-Supported Binary Metal Oxide Catalysts for Low-temperature Selective Catalytic Reduction of NOx with NH3

IF 3.1 4区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Chemical Research in Chinese Universities Pub Date : 2008-09-01 DOI:10.1016/S1005-9040(08)60129-4

Bi-jun WU , Xiao-qin LIU , Ping XIAO , Shu-gang WANG

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引用次数: 6

Abstract

Binary metal oxide(MnO_x-A/TiO₂) catalysts were prepared by adding the second metal to manganese oxides supported on titanium dioxide(TiO₂), where, A indicates Fe₂O₃, WO₃, MoO₃, and Cr₂O₃. Their catalytic activity, N₂ selectivity, and SO₂ poisonous tolerance were investigated. The catalytic performance at low temperatures decreased in the following order: Mn-W/TiO₂>Mn-Fe/TiO₂>Mn-Cr/TiO₂>Mn-Mo/TiO₂, whereas the N₂ selectivity decreased in the order: Mn-Fe/TiO₂>Mn-W/TiO₂>Mn-Mo/TiO₂>Mn-Cr/TiO₂. In the presence of 0.01% SO₂ and 6% H₂O, the NO_x conversions in the presence of Mn-W/TiO₂, Mn-Fe/TiO₂, or Mn-Mo/TiO₂ maintain 98.5%, 95.8% and 94.2%, respectively, after 8 h at 120 °C at GHSV 12600 h^-1. As effective promoters, WO₃ and Fe₂O₃ can increase N₂ selectivity and the resistance to SO₂ of MnO_x/TiO₂ significantly. The Fourier transform infrared(FTIR) spectra of NH₃ over WO₃ show the presence of Lewis acid sites. The results suggest that WO₃ is the best promoter of MnO_x/TiO₂, and Mn-W/TiO₂ is one of the most active catalysts for the low temperature selective catalytic reduction of NO with NH₃.

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二氧化钛负载二元金属氧化物催化剂在NH3低温选择性催化还原NOx中的应用

将第二金属添加到二氧化钛(TiO2)负载的锰氧化物中，制备了二元金属氧化物(MnOx-A/TiO2)催化剂，其中A代表Fe2O3、WO3、MoO3和Cr2O3。研究了它们的催化活性、N2选择性和SO2毒性。低温催化性能的降低顺序为Mn-W/TiO2>Mn-Fe/TiO2>Mn-Cr/TiO2>Mn-Mo/TiO2 /TiO2; N2选择性的降低顺序为Mn-Fe/TiO2>Mn-W/TiO2>Mn-Mo/TiO2>Mn-Cr/TiO2。在SO2含量为0.01%、H2O含量为6%的条件下，Mn-W/TiO2、Mn-Fe/TiO2和Mn-Mo/TiO2在120℃、12600 h-1温度下加热8 h后，NOx转化率分别保持在98.5%、95.8%和94.2%。作为有效的促进剂，WO3和Fe2O3可以显著提高MnOx/TiO2的N2选择性和对SO2的抗性。NH3在WO3上的傅里叶红外变换(FTIR)光谱显示了Lewis酸位点的存在。结果表明，WO3是MnOx/TiO2的最佳促进剂，Mn-W/TiO2是NH3低温选择性催化还原NO的活性催化剂之一。

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来源期刊

Chemical Research in Chinese Universities 化学-化学综合

CiteScore

5.30

自引率

6.50%

发文量

152

审稿时长

3.0 months

期刊介绍： The journal publishes research articles, letters/communications and reviews written by faculty members, researchers and postgraduates in universities, colleges and research institutes all over China and overseas. It reports the latest and most creative results of important fundamental research in all aspects of chemistry and of developments with significant consequences across subdisciplines. Main research areas include (but are not limited to): Organic chemistry (synthesis, characterization, and application); Inorganic chemistry (bio-inorganic chemistry, inorganic material chemistry); Analytical chemistry (especially chemometrics and the application of instrumental analysis and spectroscopy); Physical chemistry (mechanisms, catalysis, thermodynamics and dynamics); Polymer chemistry and polymer physics (mechanisms, material, catalysis, thermodynamics and dynamics); Quantum chemistry (quantum mechanical theory, quantum partition function, quantum statistical mechanics); Biochemistry; Biochemical engineering; Medicinal chemistry; Nanoscience (nanochemistry, nanomaterials).