Pd catalysts supported on Co3O4 with the specified morphologies in CO and CH4 oxidation

被引:51
作者
Chen, Zhiping [1 ,2 ]
Wang, Sheng [1 ]
Ding, Ya [1 ,2 ]
Zhang, Lei [1 ,2 ]
Lv, Lirong [1 ,2 ]
Wang, Mingzhe [1 ]
Wang, Shudong [1 ]
机构
[1] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China
基金
中国国家自然科学基金;
关键词
Pd supported; Cobalt Oxide (Co3O4); CH4; combustion; CO oxidation; Surface O-ads/O-lat molar ratio; RAY PHOTOELECTRON-SPECTROSCOPY; LOW-TEMPERATURE OXIDATION; NANOCRYSTALLINE COBALT OXIDE; H BOND ACTIVATION; PD/AL2O3; CATALYSTS; METHANE COMBUSTION; METAL-OXIDES; PERFORMANCE; PALLADIUM; ALUMINA;
D O I
10.1016/j.apcata.2016.12.021
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
Firstly, the spinel cobalt oxide (Co3O4) was controllably synthesized with different morphologies (cubical, flower-like, plate-like and rectangular-like) via a hydrothermal method. Then Pd was loaded on them by incipient wetness impregnation. The properties of the samples prepared were characterized by XRD, H-2-TPR, CO-TPR, SEM, TEM, HRTEM and XPS. The impacts of Pd addition on CH4 and CO oxidation were investigated under lean methane and CO atmosphere, respectively. The effectiveness of Pd was different for CH4 and CO oxidation. For methane oxidation, the activities of Co3O4 were enhanced due to Pd loading. And the orders of activity primarily kept consistent before and after impregnation, while the extent of improvement on activity from Co3O4 to Pd/Co3O4 was consistent with the order of surface O-ads/O-lat of Pd/Co3O4, indicating that different interaction occurred between Pd species unit cell and the Co3O4 unit cell with different crystal planes. In the case of CO oxidation, a significant decline on activity was observed over the Pd/Co3O4-R (rectangular-like Co3O4), Pd/Co3O4-F (flower-like Co3O4), Pd/Co3O4-P (plate-like Co304), while a distinct promotion on activity was observed over the Pd/Co3O4-C (cubical Co3O4). Similarly the variations in the activity of Pd/Co3O4 were ascribed to the shifts on surface O-ads/O-lat molar ratio and the specific area reaction rate. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:95 / 104
页数:10
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