CIESC Journal ›› 2021, Vol. 72 ›› Issue (10): 5159-5171.DOI: 10.11949/0438-1157.20210575

• Catalysis, kinetics and reactors • Previous Articles     Next Articles

Preparation of La0.8Sr0.2Mn1-xCuxO3 by flame spray synthesis method and catalytic performance for CO oxidation

Hao ZHOU(),Qiwei WU,Fangzheng CHENG   

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2021-04-25 Revised:2021-08-09 Online:2021-10-05 Published:2021-10-05
  • Contact: Hao ZHOU

火焰喷雾合成法制备La0.8Sr0.2Mn1-xCuxO3催化氧化CO性能研究

周昊(),伍其威,程方正   

  1. 浙江大学能源清洁利用国家重点实验室,浙江 杭州 310027
  • 通讯作者: 周昊
  • 作者简介:周昊(1973—),男,博士,教授,zhouhao@zju.edu.cn
  • 基金资助:
    国家杰出青年基金项目(51825605)

Abstract:

La0.8Sr0.2Mn1-xCuxO3 (x=0,0.1,0.2,0.3,0.4) perovskite catalysts with Sr2+ and Cu2+ substituted at A and B sites were prepared by flame spray synthesis method for CO catalytic oxidation, and the effects of water vapor and CO2 on the CO oxidation activity of the catalysts were investigated. The structure and catalytic activity of La0.8Sr0.2Mn1-xCuxO3 catalysts were characterized and analyzed by XRD, SEM, EDS, BET, XPS, H2-TPR and O2-TPD. The catalysts prepared by flame spray synthesis exhibit good perovskite phases, loose porous structure and catalytic oxidation activity. La0.8Sr0.2Mn0.9Cu0.1O3 achieves 50% CO and 90% CO conversion at 119.4℃ and 133.3℃, respectively. The doping of water vapor and CO2 will form competitive adsorption with CO on the surface of the perovskite, resulting in the performance degradation of the five catalysts. And La0.8Sr0.2Mn0.9Cu0.1O3 can achieve 90% CO conversion at 150.2℃. In the continuous stable catalytic oxidation test, the catalytic activity decreased less than 10%. Combined with the above CO catalytic oxidation experiment, the catalyst prepared by the flame spray synthesis method has good stability and catalytic activity, and is suitable for preparing a perovskite catalyst with high CO catalytic oxidation activity.

Key words: perovskite catalyst, flame spray synthesis, carbon monoxide, waste treatment, catalysis

摘要:

采用火焰喷雾合成法制备了Sr2+、Cu2+分别取代A、B位的La0.8Sr0.2Mn1-xCuxO3x=0,0.1,0.2,0.3,0.4)钙钛矿催化剂,并用于CO催化氧化实验,研究了水蒸气和CO2对催化剂CO氧化活性的影响。对不同取代量La0.8Sr0.2Mn1-xCuxO3 催化剂进行了XRD、SEM、EDS、BET、XPS、H2-TPR和O2-TPD等表征测试。结果表明,火焰喷雾合成法制备的钙钛矿催化剂具有良好的钙钛矿相、疏松多孔结构和催化氧化活性。其中,La0.8Sr0.2Mn0.9Cu0.1O3分别在119.4℃和133.3℃实现50%和90%的CO转化率。掺杂水蒸气和CO2会与CO在催化剂表面形成竞争吸附,导致5种催化剂性能衰减,但La0.8Sr0.2Mn0.9Cu0.1O3仍能在150.2℃实现90%的CO催化转化,在连续稳定性催化氧化测试中,5种催化剂性能衰减不超过10%。结合上述CO催化氧化实验,火焰喷雾合成法制备的催化剂具有良好的稳定性和催化活性,适合制备高CO催化氧化活性的钙钛矿催化剂。

关键词: 钙钛矿催化剂, 火焰喷雾法合成, 一氧化碳, 废物处理, 催化

CLC Number: