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第 36 卷第 2 期 精 细 化 工 Vol.36, No.2
201 9 年 2 月 FINE CHEMICALS Feb. 2019

催化与分离提纯技术
La Sr MnO /MgAl O 丝网蜂窝催化剂
3
0.2
2
0.8
4
用于低浓度甲烷催化燃烧

王忍青 1,2 ，段伟杰 1,2 ，黄 波 1,2 ，江志东 1,2*

（1. 上海交通大学 化学化工学院，上海 200240；2. 上海市绝缘与老化重点实验室，上海 200240）

摘要：首先，采用沉积-沉淀法制备了与镁铝尖晶石（MgAl 2 O 4 , 简称 MA）载体复合的镧锶锰钙钛矿（La 0.8 Sr 0.2 MnO 3 ,
简称 LSM）催化剂 LSMn，考察了 MA 与 LSM 的物质的量比（n）、前驱体老化和焙烧温度系列制备条件的影响，
在程序升温微反应器中测试了 LSMn 粉体对低浓度甲烷催化燃烧反应的活性，并用 FTIR、H 2 -TPR、BET、XRD
和 SEM 手段对催化剂进行表征。结果表明：在 10 ℃老化和 800 ℃下焙烧的 LSM4 性能最佳，T 50 为 489.4 ℃，
2
活化能 E a =112.5 kJ/mol，BET 比表面积仍有 81.6 m /g，表现出较好的抗烧结性能。然后，用浆料涂覆法依次将
第二载体（MA）和 LSM4 粉体涂覆在 Fe-Cr-Al 合金丝网上制得了丝网蜂窝催化剂。考察了第二载体及 LSM/4MA
–1
粉体涂覆量的影响，在空速 40000 h 条件下测试了蜂窝催化剂的活性，结果表明，MA 的最佳涂覆厚度约 20 m，
2
LSM/4MA 的最佳涂覆量约为 2.65 mg/cm ，甲烷转化率 30%以上。
关键词：沉积-沉淀法；镧锶锰钙钛矿；MgAl 2 O 4 尖晶石；抗烧结；丝网蜂窝催化剂
中图分类号：TQ541 文献标识码：A 文章编号：1003-5214 (2019) 02-0250-07

Development and Application of La 0.8Sr 0.2MnO 3/MgAl 2O 4 Wire-mesh
Honeycomb Catalyst for Catalytic Combustion of Air Diluted Methane

1,2
1,2
1,2
WANG Ren-qing , Duan Wei-jie , HUANG Bo , JIANG Zhi-dong 1,2*
（1. School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Shanghai
Key Lab of Electric Insulation and Thermal Aging, Shanghai 200240, China）
Abstract: The composite powders of La 0.8Sr 0.2MnO 3 (LSM) perovskite and MgAl 2O 4 (MA) spinel, named
as LSMn were prepared by deposition-precipitation method. The factors affecting preparation conditions,
such as molar ratio of MA to LSM (n), aging temperature and calcination temperature of precursors were
investigated. The activity of LSMn samples for the catalytic combustion of air diluted methane was
evaluated in a temperature-programmed micro reactor. The properties of catalysts were characterized by
FTIR, H 2-TPR, BET, XRD and SEM. The results showed that when precursor was aged at 10 ℃ and
calcined at 800 ℃, the resulting LSM4 sample demonstrated the best activity (T 50 =489.4 ℃; E a =112.5 kJ/mol)
2
and exhibited excellent sintering resistance with a specific surface area of 81.6 m /g. The second carrier MA
and LSM4 powders were then coated on Fe-Cr-Al wire mesh by dip-coating method to prepare wire mesh
honeycomb catalysts. The effects of MA loading and LSM4 coating on the catalytic combustion of 0.5%
–1
methane were investigated at GHSV of 40000 h , respectively. The results revealed that the proper coating
2
thickness of MA was around 20 m, and the best loading of LSM4 was about 2.65 mg/cm . The methane
conversion over this wire mesh honeycomb catalyst was above 30%.
Key words: deposition-precipitation; La 0.8Sr 0.2MnO 3 perovskite; MgAl 2O 4 spinel; anti-sintering; wire-mesh
honeycomb

收稿日期：2018-09-06; 定用日期：2018-10-29; DOI: 10.13550/j.jxhg.20180664
作者简介：王忍青（1993—），男，硕士生，E-mail：10281211@sjtu.edu.cn。联系人：江志东（1967—），男，博士，副教授，
E-mail：zdjiang@sjtu.edu.cn。