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Relationship between the 13C chemical shifts of adsorbed mesityl oxide and acid strength of solid acid catalysts

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2023, 33(3), pp.947-956
  • DOI : 10.1007/s42823-023-00475-6
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : January 3, 2023
  • Accepted : January 31, 2023
  • Published : May 1, 2023

Liu Fei 1 Liu Fengqing 2 Qin Qin 1 Zou Jing 1 Jiang Jizhou 1

1Wuhan Institute of Technology
2Wuhan Institute of Physics and Mathematics

Accredited

ABSTRACT

The carbon-containing molecule can be used as an NMR probe to explore the acidic and structural features of various catalytic materials. Thereinto, although mesityl oxide (MO) has been extensively employed to determine the acidity of solution and ionic liquid systems, could it be utilized to characterize the acidic properties of solid acid catalysts? In this work, on the basis of a series of isolated Brønsted and Lewis acid models with varied acid strengths, the adsorption configurations and corresponding 13C chemical shifts of adsorbed MO molecules have been comprehensively studied by means of a theoretical investigation approach. Among them, both the 13C chemical shift difference between β and α carbon atoms (Δδ), and the 13C chemical shift of β carbon atoms (δ13Cβ) in adsorbed MO molecules were explicitly demonstrated to be closely related to the intrinsic acid strength of Brønsted acid sites. These correlations could be utilized to quantitatively scale the Brønsted acid strength of solid acid catalysts. Besides, a moderate relationship was theoretically derived for the relevant 13C NMR parameters and intrinsic Lewis acid strength.

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