摘要
采用火焰喷雾合成法制备了Sr^(2+)、Cu^(2+)分别取代A、B位的La_(0.8)Sr_(0.2)Mn_(1-x)Cu_(x)O_(3)(x=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CO_(2)对催化剂CO氧化活性的影响。对不同取代量La_(0.8)Sr_(0.2)Mn_(1-x)Cu_(x)O_(3)催化剂进行了XRD、SEM、EDS、BET、XPS、H_(2)-TPR和O_(2)-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,La_(0.8)Sr_(0.2)Mn_(0.9)Cu_(0.1)O_3分别在119.4℃和133.3℃实现50%和90%的CO转化率。掺杂水蒸气和CO_(2)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La_(0.8)Sr_(0.2)Mn_(0.9)Cu_(0.1)O_(3)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。
La_(0.8)Sr_(0.2)Mn_(1-x)Cu_(x)O_(3)(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 CO_(2) on the CO oxidation activity of the catalysts were investigated.The structure and catalytic activity of La_(0.8)Sr_(0.2)Mn_(1-x)Cu_(x)O_(3) catalysts were characterized and analyzed by XRD,SEM,EDS,BET,XPS,H_(2)-TPR and O_(2)-TPD.The catalysts prepared by flame spray synthesis exhibit good perovskite phases,loose porous structure and catalytic oxidation activity.La_(0.8)Sr_(0.2)Mn_(0.9)Cu_(0.1)O_(3) achieves 50%CO and 90%CO conversion at 119.4℃and 133.3℃,respectively.The doping of water vapor and CO_(2) will form competitive adsorption with CO on the surface of the perovskite,resulting in the performance degradation of the five catalysts.And La_(0.8)Sr_(0.2)Mn_(0.9)Cu_(0.1)O_(3) 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.
作者
周昊
伍其威
程方正
ZHOU Hao;WU Qiwei;CHENG Fangzheng(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,Zhejiang,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第10期5159-5171,共13页
CIESC Journal
基金
国家杰出青年基金项目(51825605)。
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
perovskite catalyst
flame spray synthesis
carbon monoxide
waste treatment
catalysis
