Ba2+ doping into Ni/Al2O3 nanofibers promotes CO2 methanation via alkaline modulation

被引：6
作者：
Zhang, Mengyuan [1 ,2 ]
Lu, Xiaoyan [1 ]
Qu, Ying [1 ]
He, Chuandong [1 ]
Dong, Jiali [1 ]
Luo, Kongliang [1 ]
Ye, Jian [1 ]
Lu, Nana [1 ]
Niu, Qiang [1 ,3 ]
Zhang, Pengfei [1 ,2 ]
Dai, Sheng [4 ]
机构：
[1] Ningxia Univ, Coll Chem & Chem Engn, State Key Lab High Efficiency Utilizat Coal & Gree, Yinchuan 750021, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China
[3] Inner Mongolia Erdos Elect Power & Met Grp Co Ltd, Natl Enterprise Technol Ctr, Ordos 016064, Inner Mongolia, Peoples R China
[4] Oak Ridge Natl Lab, Chem Sci Div, Oak Ridge, TN USA
来源：
CHEMICAL ENGINEERING JOURNAL | 2024年 / 497卷
基金：
中国国家自然科学基金;
关键词：
Ba2+ doping; CO2 adsorption capacity; Nanofiber; CO2; methanation; DFT calculations; OXYGEN VACANCIES; SURFACE; HYDROGENATION; CATALYSTS;
D O I：
10.1016/j.cej.2024.154872
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Ni-based catalysts are promising catalysts for CO2 methanation due to low lost. However, the activity and selectivity of Ni-based catalysts in CO2 methanation at low temperatures still need to be improved. Here, Ni4Al2BamOx (m = 0-0.5) nanofibers were prepared. Doping Ba2+ would increase alkaline sites and facilitate generating oxygen vacancies. Especially, Ni4Al2Ba0.2Ox exhibited the high specific surface area with 127.1 m(2) g(-1), being potential for exposing more active sites. Indeed, compared with undoped Ni4Al2Ox catalysts (CO2 conv. = 45 %, CH4 select. = 92 % at 300 degrees C), Ba2+ doping significantly improved activity (CO2 conv. = 74 %, CH4 select. = 99% at 300 degrees C) and stability within 200 h for Ni(4)Al(2)Ba(0.2)Ox. Both EPR and O-1S XPS confirmed that Ni(4)Al(2)Ba(0.2)Ox can form more oxygen vacancies and CO2-TPD confirmed that Ni(4)Al(2)Ba(0.2)Ox had stronger CO2 adsorption capacity compared to Ni4Al2Ox. In-situ infrared spectroscopy and DFT calculations both indicated that Ba2+ doping can promote generating surface hydroxyl groups and formate pathways.
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页数：12
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