燃料化学学报（中英文）2025，Vol.53Issue(12)：1769-1778,10.DOI:10.1016/S1872-5813(25)60585-8
Ni@CNTs限域催化剂的制备及其CO2加氢制甲烷性能研究
Preparation and performance of spatially confined catalysts Ni@CNTs for CO2 hydrogenation to methane
摘要
Abstract
Multi-walled carbon nanotubes(CNTs)were treated by acid oxidation-ultrasonication.Nickel-based catalysts with spatial confinement were prepared using both pristine and treated CNTs as the encapsulating layer.The effects of the treatment on CNT length,structural properties,and the size of the incorporated nickel particles were investigated by scanning electron microscopy(SEM),Raman spectroscopy and nitrogen physisorption(BET).The catalytic performance of the catalyst for the CO2 methanation reaction was evaluated.The results show that acid oxidation-ultrasonic treatment can significantly shorten the length of the CNTs.This length reduction facilitates a higher incorporation efficiency of nickel particles.Compared with the untreated nanoscale CNTs,the average length of CNTs treated with mixed acid(concentrated sulfuric acid and concentrated nitric acid in the ratio of 3∶1 by volume)for 45 min and ultrasonic for 2 h is reduced to about 100 nm and the nickel-metal filling efficiency increase from 34.65％to 93.84％.In addition to shortening CNT length,the acid oxidation-ultrasonication treatment can introduce structural defects in the CNT walls both and increase both the pore volume and specific surface area of CNTs,which can promote the efficient encapsulation of nickel metals within CNTs.The confinement effect of CNTs successfully reduces the average particle size of nickel-metal from 14.92 nm to 7.14 nm and improves metal dispersion.Consequently,the confined catalyst exhibits enhanced activity in CO2 methanation,achieving a CO2 conversion of 79.52％and a methane selectivity of 98.98％.关键词
酸氧化-超声法/碳纳米管长度/限域催化剂/金属填充效率/CO2甲烷化Key words
acid oxidation-ultrasonication/carbon nanotube length/domain-limited catalyst/metal filling efficiency/CO2 methanation分类
化学化工引用本文复制引用
张世博,邢海鸣,何欣颖,谭延芹,罗辉,杜峰,邓文安,李传..Ni@CNTs限域催化剂的制备及其CO2加氢制甲烷性能研究[J].燃料化学学报（中英文）,2025,53(12):1769-1778,10.基金项目
The project was supported by Shandong Provincial Natural Science Foundation(ZR2022MB116).山东省自然科学基金面上项目(ZR2022MB116)资助 （ZR2022MB116）
