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Addressing the quantitative conversion bottleneck in single-atom catalysis.

Zhongxin Chen1, Jingting Song1,2, Rongrong Zhang1,2

  • 1Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.

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|May 19, 2022
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Summary
This summary is machine-generated.

Single-atom catalysts (SACs) achieve high conversion in liquid-phase reactions using fuel cell-type flow stacks. This approach overcomes productivity bottlenecks and catalyst leaching in fine chemical production.

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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Single-atom catalysts (SACs) offer high atom economy and selectivity but face productivity and leaching issues in liquid-phase heterogeneous catalysis.
  • Existing flow chemistry methods for SACs in packed-bed reactors suffer from low turnover numbers and poor stability.

Purpose of the Study:

  • To demonstrate the use of fuel cell-type flow stacks for high-efficiency single-atom catalysis.
  • To overcome the quantitative conversion bottleneck in SAC-mediated fine chemical production.

Main Methods:

  • Incorporation of platinum single-atom catalysts on MoS2/graphite felt (Pt SAC-on-MoS2/graphite felt) into a fuel cell-type flow stack.
  • Utilizing X-ray absorption fine structure spectroscopy and density functional theory calculations to investigate catalyst stability and reactivity.

Main Results:

  • Achieved a turnover frequency of approximately 8000 h⁻¹ and an aniline productivity of 5.8 g h⁻¹ using a bench-top flow module.
  • Demonstrated exceptional quantitative conversion in single-atom catalyzed reactions.
  • Identified a pyramidal support structure for single-atom Pt on MoS2, providing insights into stability and reactivity.

Conclusions:

  • Fuel cell-type flow stacks effectively enhance conversion rates and stability for SACs in liquid-phase reactions.
  • This flow chemistry approach overcomes the productivity bottleneck in SAC-mediated fine chemical synthesis.
  • The study highlights a viable strategy for scalable and efficient production using single-atom catalysis.