Bean dregs‐derived hierarchical porous carbons as metal‐free catalysts for efficient dehydrogenation of propane to propylene

BACKGROUND Recently, nanocarbons (e.g. carbon nanotubes, nanodiamond and mesoporous carbon) were found to be efficient catalysts in dehydrogenation reactions. However, the preparation of these nanocarbons is costly, complicated and time‐consuming. The goal of this study is to exploit a biomass‐deriv...

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Published in:Journal of chemical technology and biotechnology (1986) 2018-12, Vol.93 (12), p.3410-3417
Main Authors: Hu, Zhong‐Pan, Zhang, Ling‐Feng, Wang, Zheng, Yuan, Zhong‐Yong
Format: Article
Language:English
Subjects:
bean dregs
Biomass
biomass carbon
Carbon
Carbon nanotubes
Carbonization
Catalysis
Catalysts
Catalytic activity
Dehydrogenation
Diamonds
Functional groups
Metals
Nanostructure
Nanotechnology
Nanotubes
Organic chemistry
Oxygenation
Porosity
porous structure
Propane
propane dehydrogenation
Propylene
Selectivity
Sodium hydroxide
Structural hierarchy
Surface area
X ray photoelectron spectroscopy
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Summary:BACKGROUND Recently, nanocarbons (e.g. carbon nanotubes, nanodiamond and mesoporous carbon) were found to be efficient catalysts in dehydrogenation reactions. However, the preparation of these nanocarbons is costly, complicated and time‐consuming. The goal of this study is to exploit a biomass‐derived carbon for propane dehydrogenation. RESULTS Biomass‐derived carbons with hierarchical porous structures and high surface area are prepared via carbonization of bean dregs with NaOH, and operated as metal‐free catalysts for direct dehydrogenation of propane to propylene. The properties of the prepared carbon catalysts are characterized by SEM, TEM, XRD, N2 sorption and XPS techniques, revealing the presence of many nanopores and oxygenated functional groups. The catalytic results show that the resultant carbons exhibit high catalytic activity, selectivity and stability for direct dehydrogenation of propane. The activation temperature can significantly affect the textural properties and surface functional groups of the carbons, and thus, affect their catalytic performance. CONCLUSION The excellent catalytic performance can be attributed to the high content of oxygenated functional groups combined with hierarchical porous structure and large surface area of the obtained porous carbons which could provide more accessible active sites. This work demonstrates the flexible utilization of bean dregs‐derived carbons in propane dehydrogenation to propylene. © 2018 Society of Chemical Industry
ISSN:0268-2575
1097-4660
DOI:10.1002/jctb.5698