Morphology effect of ceria support with hierarchical structure on the catalytic performance for nickel-based catalysts in dry reforming of methane

被引:38
作者
Gao, Shuqin [1 ,2 ]
Li, Yanan [1 ,2 ]
Guo, Wenzhao [1 ,2 ]
Ding, Xin [1 ]
Zheng, Lan [1 ]
Wu, Le [1 ]
Yan, Hongli [3 ]
Wang, Yuqi [1 ,2 ]
机构
[1] Northwest Univ, Sch Chem Engn, Xian 710069, Peoples R China
[2] Shaanxi Key Lab Carbon Neutral Technol, Xian 710069, Peoples R China
[3] Xi An Jiao Tong Univ City Coll, Dept Mech Engn, Xian 710018, Peoples R China
来源
MOLECULAR CATALYSIS | 2022年 / 533卷
基金
中国国家自然科学基金;
关键词
Ceria supports; Ni; CeO; 2; catalysts; Dry reforming of methane; Surface oxygen vacancies; Strong metal -support interaction; CO OXIDATION; HYDROGEN-PRODUCTION; OXYGEN VACANCIES; CEO2; NI; STEAM; NANOFLAKES; INTERFACE; OXIDE;
D O I
10.1016/j.mcat.2022.112766
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
CeO2 is widely used as Ni-based catalyst support in methane dry reforming (DRM), and the hierarchical structure of the ceria behaves a favorable effect on the performance of the catalyst. Ceria with different morphologies, including dumbbell (CeO2-D), bouquet (CeO2-B) and shuttle (CeO2-S) shapes, are hydrothermally prepared, and the effect of ceria shape on the catalytic performance of Ni/CeO2 in DRM is investigated by a fixed-bed tubular reactor. The results indicate that Ni/CeO2-D demonstrates the best reaction conversions & TOF value, whose conversions of CH4 & CO2 can reach 92% & 87%, respectively. Furthermore, a series of characterization results (XPS, H2-TPR and Raman) confirm that the Ni/CeO2-D own the abundant oxygen vacancies and strong metalsupport interaction, which promote the reactivity of CH4 and CO2, resulting in its most prominent catalytic performance. Additionally, Ni/CeO2-D possesses other distinct advantages due to its hierarchical dumbbell-like structure confirmed by high Ni dispersion (H2-TPD), abundant surface oxygen (H2-TPR) and sufficient basic sites (CO2-TPD).
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页数:14
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