Effect of niobium on the activity of Pd/xNb/Ce0.5Zr0.5O2 catalyst for CH4 combustion

被引：9
作者：
Ding, Ya [1 ,2 ]
Wang, Sheng [1 ]
Zhang, Lei [1 ,2 ]
Lv, Lirong [1 ,2 ]
Gao, Yang [1 ,2 ]
Wang, Shudong [1 ]
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
CATALYSIS COMMUNICATIONS | 2020年 / 144卷
基金：
中国国家自然科学基金;
关键词：
Niobium oxide; Pd; CH4 catalytic combustion; Surface acidity; MIXED-OXIDE CATALYST; SOLID-SOLUTIONS; OXYGEN STORAGE; ACID STRENGTH; CO OXIDATION; REDUCTION; SUPPORT; METHANE; NOX; PERFORMANCE;
D O I：
10.1016/j.catcom.2020.106084
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 series of Pd/NbOx/Ce0.5Zr0.5O2 catalysts of varying Nb loading were synthesized and tested for the methane combustion. The introduction of Nb (Nb2O5) improved significantly the CH4 combustion activity over the Pd/Ce0.5Zr0.5O2 catalyst. The site activity (TOF, s(-1)) was found to increase with increasing loading of Nb. The latter enhancement was possibly attributed to a synergetic effect between Pd and Nb2O5. The addition of Nb was found to tune not only Pd dispersion but also the concentration of adsorbed surface oxygen species and the surface acidity of the catalyst. The latter was found to be strongly related to the catalytic activity.
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页数：5
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