Performance of La0.8K0.2Mn0.95Cu0.05O3 in oxidizing model soot in atmosphere mixed with SO2

Abstract

Abstract:

La_0.8K_0.2Mn_0.95Cu_0.05O₃ perovskite-type oxide was synthesized by the complex method of citric acid, then was supported on γ-Al₂O₃to obtain a series of loadings by using the impregnation method, complexing method and mixing method. Temperature programmed oxidation (TPO) was used to investigate their catalytic behavior of model soot oxidation in a feed gas containing various concentrations of SO₂. The catalysts were characterized with XRD, BET, and FT-IR. XRD and BET results showed that the catalysts exhibited good structure of perovskite-type before being supported, and the specific surface area increased after being supported. TPO tests revealed that the activity of La_0.8K_0.2Mn_0.95Cu_0.05O₃/γ-Al₂O₃ prepared by the impregnation method with 20%(mass) loading was better. La_0.8K_0.2Mn_0.95Cu_0.05O₃catalyst presented higher catalytic activity than those supported ones, i. e. La_0.8K_0.2Mn_0.95Cu_0.05O₃/γ-Al₂O_3, however, sulfur-resistance of catalysts was improved when supported on γ-Al₂O₃. FT-IR spectrum confirmed that with increasing concentration of SO₂, the SO^2-₄ species formed and accumulated on the catalyst surface would inhibit the catalytic activity.

Key words:

钙钛矿型催化剂, 柠檬酸络合法, 浸渍法, 二氧化硫, 炭烟氧化

摘要：

采用柠檬酸络合法合成La_0.8K_0.2Mn_0.95Cu_0.05O₃钙钛矿型催化剂，并用浸渍法、络合法、混合法制备了系列担载型催化剂La_0.8K_0.2Mn_0.95Cu_0.05O₃/γ-Al₂O₃。运用程序升温氧化（TPO）对未担载及不同担载量下的催化剂进行了活性评价，并考察了在不同浓度的SO₂气氛下催化剂氧化模拟炭烟的性能，采用XRD、BET和FT-IR对催化剂进行了表征。XRD和BET测试结果显示，担载前催化剂具有良好的钙钛矿结构，担载后催化剂的比表面积增大；TPO测试表明浸渍法制备担载量为20%的催化剂表现了更好的催化活性。未担载的催化剂活性较高，但催化剂担载后耐硫性能得到提高。FT-IR证实了随着SO₂浓度的升高催化剂表面产生的硫酸盐物种逐渐积累从而抑制了催化剂的活性。

关键词:

钙钛矿型催化剂, 柠檬酸络合法, 浸渍法, 二氧化硫, 炭烟氧化

LIU Xiaojuan, HUANG Bichun, FU Mingli, YE Daiqi, LIANG Hong. Performance of La_0.8K_0.2Mn_0.95Cu_0.05O₃in oxidizing model soot in atmosphere mixed with SO₂[J]. CIESC Journal, 2010, 61(3): 704-711.

刘晓娟, 黄碧纯, 付名利, 叶代启, 梁红. La_0.8K_0.2Mn_0.95Cu_0.05O₃在含SO₂气氛下氧化模拟炭烟的性能
[J]. 化工学报, 2010, 61(3): 704-711.

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Performance of La_0.8K_0.2Mn_0.95Cu_0.05O₃in oxidizing model soot in atmosphere mixed with SO₂

La_0.8K_0.2Mn_0.95Cu_0.05O₃在含SO₂气氛下氧化模拟炭烟的性能

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