4.2 Article

Photocatalytic Oxidative Dehydrogenation of Propane for Selective Propene Production with TiO2

Journal

JACS AU
Volume 2, Issue 11, Pages 2607-2616

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jacsau.2c00512

Keywords

photocatalysis; TiO2; ODHP; propene; reaction mechanism

Funding

  1. National Key R&D Program of China [2018YFE0203002]
  2. National Natural Science Foundation of China [22173041, 22103033, 22103031, 22173042, 21973037]
  3. NSFC Center for Chemical Dynamics
  4. Strategic Priority Research Program of Chinese Academy of Sciences [XDB17000000]
  5. Shenzhen Science and Technology Innovation Committee [JCYJ2019080914021660, ZDSYS20200421111001787]
  6. Guangdong Innovative & Entrepreneurial Research Team Program [2019ZT08L455, 2019JC01X091]
  7. International Partnership Program of Chinese Academy of Science [121421KYSB20170012]
  8. Innovation Program for Quantum Science and Technology [2021ZD0303304]

Ask authors/readers for more resources

This study successfully converts propane to propene through photocatalysis at low temperature and achieves high selectivity on a model surface. The research results not only advance our understanding of C-H bond activation but also provide a new pathway for highly selective ODHP reactions.
Oxidative dehydrogenation of propane (ODHP) as an exothermic process is a promising method to produce propene (C3H6) with lower energy consumption in chemical industry. However, the selectivity of the C3H6 product is always poor because of overoxidation. Herein, the ODHP reaction into C3H6 on a model rutile(R)-TiO2(110) surface at low temperature via photocatalysis has been realized successfully. The results illustrate that photocatalytic oxidative dehydrogenation of propane (C3H8) into C3H6 can occur efficiently on R-TiO2(110) at 90 K via a stepwise manner, in which the initial C-H cleavage occurs via the hole coupled C-H bond cleavage pathway followed by a radical mediated C-H cleavage to the C3H6 product. An exceptional selectivity of similar to 90% for C3H6 production is achieved at about 13% propane conversion. The mechanistic model constructed in this study not only advances our understanding of C-H bond activation but also provides a new pathway for highly selective ODHP into C3H6 under mild conditions.

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