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Oxidation Numbers03:14

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The eukaryotic promoter region is a segment of DNA located upstream of a gene. It contains an RNA polymerase binding site, a transcription start site, and several cis-regulatory sequences.  The proximal promoter region is located in the vicinity of the gene and has cis-regulatory sequences and the core promoter. The core promoter is the binding site for RNA polymerase and is usually located between -35 and +35 nucleotides from the transcription start site. The distal promoter regions are...
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Remarkable active-site dependent H2O promoting effect in CO oxidation.

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  • 1Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of the Ministry of Education, Tsinghua University, 100084, Beijing, China.

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|August 25, 2019
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Single-atom catalysts (SACs) show enhanced CO oxidation activity, significantly boosted by water. This water-promoted effect makes gold SACs far more active than traditional nanocatalysts and commercial catalysts.

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Area of Science:

  • Heterogeneous catalysis
  • Materials science
  • Surface chemistry

Background:

  • Interfacial sites on supported metal catalysts are crucial for performance.
  • Single-atom catalysts (SACs) maximize atom-support interfacial sites.
  • The catalytic properties of single-atom sites versus nanocatalyst interfacial sites remain unclear.

Purpose of the Study:

  • To investigate the active-site dependent catalytic performance of supported gold single atoms and nanoparticles.
  • To compare the effect of water on CO oxidation over gold single-atom sites and nanoparticle interfacial sites.
  • To elucidate the mechanism behind water's promotion of CO oxidation on gold SACs.

Main Methods:

  • Synthesis and characterization of supported gold single atoms and nanoparticles.
  • Experimental evaluation of CO oxidation activity over different gold catalysts.
  • Theoretical studies (e.g., DFT calculations) to understand reaction mechanisms.

Main Results:

  • CO oxidation on gold single-atom sites is dramatically promoted by water.
  • The promoting effect of water on gold nanoparticle interfacial sites is significantly weaker.
  • Gold SACs exhibit two orders of magnitude higher activity than commercial three-way catalysts due to water's influence.
  • Theoretical studies reveal water facilitates a CO + OH reaction channel on SACs.

Conclusions:

  • Catalytic performance is dependent on the nature of the active site (single atom vs. nanoparticle).
  • Water plays a critical role in enhancing CO oxidation over gold SACs via a unique reaction pathway.
  • Gold SACs represent a highly active catalyst for CO oxidation, surpassing conventional catalysts.