Journal
CHEMICAL ENGINEERING JOURNAL
Volume 446, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137150
Keywords
Edge defect; Nitrogen doping; Density functional theory; Oxygen dissociation; Ethanol oxidative dehydrogenation
Categories
Funding
- Fundamental Research Funds for the Central Universities (Special Project of Civil Aviation University of China) [3122021062]
- National Natural Science Foundation of China [51425302, 51702062]
- Australian Research Council [DP190103548]
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In this study, we developed an edge-rich carbon nanotube/nanoribbon hybrid catalyst for the oxidative dehydrogenation of ethanol to acetaldehyde. The catalytic activity was significantly enhanced by the edge-rich structure and nitrogen doping, leading to a high ethanol conversion rate.
Bioethanol is a promising candidate for acetaldehyde production. In this study, we controllably unzipped multiwalled carbon nanotubes into open-edged nanotube/nanoribbon hybrids via a nano-cutting strategy for metalfree oxidative dehydrogenation of ethanol to acetaldehyde and unravelled the catalytic role of edge defects in the reaction. The edge-rich structure of the 1D-nanotube/2D-nanoribbon hybrid can accelerate the catalytic reaction more efficiently than pristine carbon sample. Moreover, edges can further accommodate nitrogen defects to preferentially form edge-doped nitrogen. Through engineering the concentration and speciation of defects, the structure-performance relationship between the defective structure and ethanol conversion rate is intensively investigated. Theoretical calculations unveil that the nitrogen doped at edge sites other than in basal planes can effectively facilitate O2 dissociation and formation of oxygen-containing active centers. Temperatureprogrammed ethanol desorption and kinetic measurements further supplement the catalytic interplay of edge and nitrogen defects on ethanol adsorption and reaction kinetics. The synergistic edge and nitrogen defects of the engineered hybrid produced a steady ethanol conversion of 47.9% and acetaldehyde selectivity of 90.2% at the gas hourly space velocity of 48,000 mL gcat-1 h- 1 on stream of 48 h. This work offers more insights to intrinsic properties and mechanism of enriched defective structures for development of effective carbocatalysts in catalytic applications.
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