Hollow Hemispherical Carbon Microspheres with Mo2C Nanoparticles Synthesized by Precursor Design: Effective Noble Metal-Free Catalysts for Dehydrogenation

Ruihua Zhao, Hui Wang, Na Gao, Rui Liu, Tianyu Guo, Jinting Wu, Tao Zhang, Jinping Li, Jianping Du, Tewodros Asefa

Research output: Contribution to journalArticle

Abstract

Noble metal-based catalysts are currently widely used for the dehydrogenation of hydrocarbons or the production of H2 from hydrocarbons for various applications. However, these catalysts are expensive and hard to scale up. In this work, a facile template-assisted synthesis of hollow carbon microspheres possessing ultrasmall molybdenum carbide (Mo2C) nanoparticles (NPs) that can efficiently catalyze the dehydrogenation of hydrocarbons is reported. The hollow structures and catalytic activity of the materials can be tuned, or optimized, by controlling the relative amount of Mo species or template used in their precursors. The bowl-like hemispherical carbons with ≈20 nm thin shells and <5 nm in diameter Mo2C NPs show superior catalytic activity for dehydrogenation of cyclohexane, with a turnover frequency value of 1 × 10−4 s−1 at 305 °C. The catalytic activity of these microspheres for the reaction is 15 times higher than that of the corresponding incomplete hollow spherical carbon microparticles possessing similar sized Mo2C NPs and also better than that of activated carbon-supported Pt (Pt/AC). Interestingly also, adding a mere 0.1% Pt into the materials leads to several-fold increase in their catalytic activity and much higher activity than that of Pt/AC.

Original languageEnglish
Article number1900597
JournalSmall Methods
DOIs
Publication statusAccepted/In press - Jan 1 2019

Fingerprint

Dehydrogenation
Precious metals
Microspheres
Catalyst activity
Carbon
Hydrocarbons
Nanoparticles
Catalysts
Cyclohexane
Activated carbon
Molybdenum
Carbides

Keywords

  • carbon-MoC composite materials
  • cyclohexane dehydrogenation
  • hollow spherical microparticles
  • hydrogen evolution
  • molybdenum carbide

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemistry(all)

Cite this

Hollow Hemispherical Carbon Microspheres with Mo2C Nanoparticles Synthesized by Precursor Design : Effective Noble Metal-Free Catalysts for Dehydrogenation. / Zhao, Ruihua; Wang, Hui; Gao, Na; Liu, Rui; Guo, Tianyu; Wu, Jinting; Zhang, Tao; Li, Jinping; Du, Jianping; Asefa, Tewodros.

In: Small Methods, 01.01.2019.

Research output: Contribution to journalArticle

Zhao, Ruihua ; Wang, Hui ; Gao, Na ; Liu, Rui ; Guo, Tianyu ; Wu, Jinting ; Zhang, Tao ; Li, Jinping ; Du, Jianping ; Asefa, Tewodros. / Hollow Hemispherical Carbon Microspheres with Mo2C Nanoparticles Synthesized by Precursor Design : Effective Noble Metal-Free Catalysts for Dehydrogenation. In: Small Methods. 2019.
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