A high-surface-area La-Ce-Mn mixed oxide with enhanced activity for CO and C3H8 oxidation

被引：20
|
作者：
Zhao, Baohuai [1 ]
Ran, Rui [1 ]
Sun, Li [1 ]
Yang, Zesheng [1 ]
Wu, Xiaodong [1 ]
Weng, Duan [1 ,2 ]
机构：
[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] Tsinghua Univ, Sch Mat Sci & Engn, Key Lab Adv Mat MOE, Beijing 100084, Peoples R China
来源：
CATALYSIS COMMUNICATIONS | 2018年 / 105卷
关键词：
Perovskite; Ce doping; Acid etching; Reactive oxygen; Low-temperature oxidation; PROPANE TOTAL OXIDATION; CATALYTIC PERFORMANCE; METHANE COMBUSTION; LAMNO3; PEROVSKITE; LOW-TEMPERATURE; VINYL-CHLORIDE; NO OXIDATION; SUBSTITUTION; TOLUENE; NI;
D O I：
10.1016/j.catcom.2017.11.007
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A high-surface-area La-Ce-Mn mixed oxide was synthesized by citrate method, with further acid etching to dissolve the La3+ ions in the lattice. The acid etching process efficiently improved the specific surface area, increased the ratios of Mn4+ /Mnn+, Ce3+/Cen+, O-alpha/O-tot, and enhanced the oxygen mobility of the catalyst, which were responsible for the superior catalytic performance. Compared to the pristine La8.8Ce0.2MnO3 + delta catalyst, the etched one could convert CO and C3H8 more efficiently, with 90% conversion of CO and C3H8 at only 73 and 196 degrees C, respectively. Such superior catalytic performance made it possible to be used for automotive emission control during cold-start period.
引用
收藏
页码：26 / 30
页数：5
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