发电技术 ›› 2023, Vol. 44 ›› Issue (3): 373-381.DOI: 10.12096/j.2096-4528.pgt.22142
王海光, 刘永峰, 张军
收稿日期:
2022-12-01
出版日期:
2023-06-30
发布日期:
2023-06-30
通讯作者:
刘永峰
作者简介:
基金资助:
Haiguang WANG, Yongfeng LIU, Jun ZHANG
Received:
2022-12-01
Published:
2023-06-30
Online:
2023-06-30
Contact:
Yongfeng LIU
Supported by:
摘要:
为有效脱除富氢气体中的CO,制备了氮掺杂的有序介孔碳及其负载纳米钴颗粒的催化剂,采用N2吸附-脱附、X射线衍射(X-ray diffraction,XRD)、拉曼光谱、X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)、热重-质谱联用(thermogravimetry-mass spectrometry,TG-MS)等手段进行表征,研究了氮掺杂对有序介孔碳负载钴基催化剂的自还原行为和CO甲烷化反应性能的影响规律。结果表明,在介孔碳骨架中引入的氮原子主要作为氧化钴的成核位点,与氧化物载体产生较强的相互作用,大大提高了钴物种的分散度,从而形成颗粒尺寸均匀的小纳米钴颗粒,显著促进了其自还原反应,进而提高了催化剂的还原度。催化剂评价结果表明,与未掺杂氮的介孔碳载体相比,氮掺杂介孔碳载体使催化剂的CO脱除效率明显提升。
中图分类号:
王海光, 刘永峰, 张军. 氮掺杂介孔碳负载钴催化剂的制备及其脱除富氢气体CO性能研究[J]. 发电技术, 2023, 44(3): 373-381.
Haiguang WANG, Yongfeng LIU, Jun ZHANG. Preparation of Nitrogen Doped Mesoporous Carbon Supported Cobalt Catalyst and Its Performance for Removal of CO in Hydrogen-Rich Gas[J]. Power Generation Technology, 2023, 44(3): 373-381.
样品 | 氮气物理吸附 | 元素质量分数/% | Raman分析 | |||||
---|---|---|---|---|---|---|---|---|
SBET /(m2/g) | Vt /(cm3/g) | Dpore /nm | N | C | H | 其他 | ID /IG | |
OMC | 580.7 | 0.65 | 4.2 | 0 | 92.6 | 2.6 | 4.8 | 0.98 |
NMC | 540.2 | 0.63 | 4.1 | 10.5 | 87.3 | 1.1 | 1.1 | 1.13 |
表1 氮气物理吸附、元素分析以及拉曼分析结果
Tab. 1 Results of nitrogen physisorption, elemental analysis and Raman analysis
样品 | 氮气物理吸附 | 元素质量分数/% | Raman分析 | |||||
---|---|---|---|---|---|---|---|---|
SBET /(m2/g) | Vt /(cm3/g) | Dpore /nm | N | C | H | 其他 | ID /IG | |
OMC | 580.7 | 0.65 | 4.2 | 0 | 92.6 | 2.6 | 4.8 | 0.98 |
NMC | 540.2 | 0.63 | 4.1 | 10.5 | 87.3 | 1.1 | 1.1 | 1.13 |
样品 | 氮气物理吸附 | STEM | H2化学吸附 | ||||
---|---|---|---|---|---|---|---|
SBET /(m2/g) | Vt /(cm3/g) | Dpore /nm | d(Co0)/nm | S2 | 分散度/% | d(Co0)/nm | |
15Co/OMC | 494.3 | 0.58 | 4.1 | 19.4 | 3.24 | 5.9 | 16.4 |
15Co/NMC | 460.2 | 0.55 | 4.0 | 6.7 | 0.21 | 16.0 | 6.0 |
表2 催化剂的织构性质以及钴颗粒尺寸
Tab. 2 Texture properties and cobalt particle size of catalysts
样品 | 氮气物理吸附 | STEM | H2化学吸附 | ||||
---|---|---|---|---|---|---|---|
SBET /(m2/g) | Vt /(cm3/g) | Dpore /nm | d(Co0)/nm | S2 | 分散度/% | d(Co0)/nm | |
15Co/OMC | 494.3 | 0.58 | 4.1 | 19.4 | 3.24 | 5.9 | 16.4 |
15Co/NMC | 460.2 | 0.55 | 4.0 | 6.7 | 0.21 | 16.0 | 6.0 |
样品 | 初始CO 体积分数 | CO转化率/% | 残余CO 体积分数 |
---|---|---|---|
15Co/NMC | 0.02 | >99.99 | 7.0×10-8 |
15Co/OMC | 0.02 | 98.65 | 2.7×10-4 |
表3 自还原样品的CO甲烷化反应性能
Tab. 3 CO methanation reaction performance of self-reduced samples
样品 | 初始CO 体积分数 | CO转化率/% | 残余CO 体积分数 |
---|---|---|---|
15Co/NMC | 0.02 | >99.99 | 7.0×10-8 |
15Co/OMC | 0.02 | 98.65 | 2.7×10-4 |
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