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

作     者：Zhang, Mengyuan Lu, Xiaoyan Dong, Jiali Luo, Kongliang Ye, Jian Lu, Nana Niu, Qiang Zhang, Pengfei Dai, Sheng 

作者机构：State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering College of Chemistry and Chemical Engineering Ningxia University Yinchuan750021 China School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai200240 China National Enterprise Technology Center Inner Mongolia Erdos Electric Power and Metallurgy Group Co Ltd Inner Mongolia Ordos016064 China Chemical Science Division Oak Ridge National Lab. Oak RidgeTN37830 United States 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Carbon dioxide 

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 m2 g-1, being potential for exposing more active sites. Indeed, compared with undoped Ni4Al2Ox catalysts (CO2 conv. = 45%, CH4 select. = 92% at 300°C), Ba2+ doping significantly improved activity (CO2 conv. = 74%, CH4 select. = 99% at 300°C) and stability within 200h for Ni4Al2Ba0.2Ox. Both EPR and O1S XPS confirmed that Ni4Al2Ba0.2Ox can form more oxygen vacancies and CO2-TPD confirmed that Ni4Al2Ba0.2Ox 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. © 2024, The Authors. All rights reserved.