DOI: 10.1016/j.jcou.2019.02.011
Scopus记录号: 2-s2.0-85062688516
论文题名: Defect-mediated hydroxylation of multi-walled carbon nanotubes as metal-free catalysts to enhance catalytic performance for oxidative dehydrogenation of ethylbenzene using CO 2
作者: Rao R. ; Dong H. ; Dong X. ; Tang Y. ; Ni S. ; Wu K. ; Hu C.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2019
卷: 31 起始页码: 8
结束页码: 15
语种: 英语
英文关键词: Hydroxylation
; Multi-walled carbon nanotubes
; Oxidative dehydrogenation of ethylbenzene in CO 2
; Surface defects
Scopus关键词: Ball milling
; Carbon dioxide
; Catalyst activity
; Defect density
; Dehydrogenation
; Ethylbenzene
; Hydroxylation
; Musculoskeletal system
; Nanocatalysts
; Nanotubes
; Surface defects
; Yarn
; Ball milling treatments
; Catalytic active sites
; Catalytic performance
; Different structure
; Graphite structures
; Metal-free catalysts
; Oxidative dehydrogenations
; Tubular morphology
; Multiwalled carbon nanotubes (MWCN)
英文摘要: The fabrication and hydroxylation of surface defects on multi-walled carbon nanotubes (MWCNTs) are performed through a single or combined method involving hydrothermal, ultrasonic and ball-milling treatments. These treatments cannot change the tubular morphology of the graphite structure in MWCNTs but they can alter the surface defect structure on MWCNTs. Surface defects on MWCNTs can promote the hydroxylation of the MWCNTs to produce hydroxyl groups. However, these defects are difficult to hydroxylate when occupied by other functional groups, such as carboxyl groups, even though the hydroxylation processes are the same. After hydroxylation, the MWCNTs with surface defects can be employed as metal-free catalysts for the oxidative dehydrogenation of ethylbenzene using CO 2 as soft oxidants. The inherent disorder or artificial skeleton defects on MWCNTs cannot directly act as catalytic active sites, but they can be hydroxylated to enhance the catalytic activity of the MWCNTs. For the same type of MWCNT defects formed after hydroxylation, the catalytic activity is closely related to the defect density. If the disorder or skeleton defects cause a higher defect density on the hydroxylated MWCNTs, the MWCNTs will exhibit a higher catalytic activity. Due to the different structures and positions of the MWCNT defect carbons, the artificial skeleton defects on MWCNTs more efficiently promote the hydroxylation of MWCNTs compared to the disorder defects, decreasing their defect density and enhancing their catalytic activity. Therefore, MWCNTs-BOH36 with skeleton defects has a catalytic activity that is twice as high as that of MWCNTs-CS-120 with disorder defects. © 2019 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117284
Appears in Collections: 气候变化与战略
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Recommended Citation:
Rao R.,Dong H.,Dong X.,et al. Defect-mediated hydroxylation of multi-walled carbon nanotubes as metal-free catalysts to enhance catalytic performance for oxidative dehydrogenation of ethylbenzene using CO 2[J]. Journal of CO2 Utilization,2019-01-01,31