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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Recent Advances in Photocatalytic Systems and Selectivity Control Mechanisms.

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This review highlights advances in photocatalytic glucose oxidation for renewable energy. Novel catalyst designs improve selectivity for high-value products from biomass, addressing energy and environmental crises.

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band structure engineeringbiomass valorizationdefect engineeringsolar energy conversionsustainable chemistry

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Area of Science:

  • Catalysis
  • Renewable Energy
  • Materials Science

Background:

  • Fossil fuel overuse drives urgent need for renewable energy solutions.
  • Photocatalysis offers a promising route for converting solar energy into chemical energy, particularly for biomass valorization.
  • Glucose oxidation is a key process for producing high-value chemicals from biomass.

Purpose of the Study:

  • To systematically review recent advancements in photocatalytic glucose oxidation.
  • To focus on catalyst design strategies and mechanisms for controlling selectivity.
  • To explore the potential of photocatalysis in sustainable biomass refining.

Main Methods:

  • Summarizing research on metal-based (TiO2, ZnO, SnO2), carbon nitride (g-C3N4), and composite photocatalysts.
  • Analyzing catalyst design strategies including crystallographic phase engineering, noble metal modification, and defect engineering.
  • Investigating mechanisms like ligand-to-metal charge transfer, Schottky junctions, and single-atom catalysis.

Main Results:

  • Pt/TiO2 achieved 84.3% selectivity for glucaric acid via oxygen vacancy mediation.
  • Au/ZnO boosted lactic acid selectivity to 38% by reducing the C2-C3 cleavage barrier.
  • Oxygen-doped ultrathin g-C3N4 yielded 89.7% lactic acid via superoxide radical pathways.
  • Composite ZnxCdxS systems achieved 87% selectivity for lactic acid and H2 evolution through phase-boundary engineering.

Conclusions:

  • Photocatalytic glucose oxidation shows significant progress with engineered catalysts.
  • Understanding reaction mechanisms is crucial for optimizing selectivity and efficiency.
  • Further development is needed for scalability and energy efficiency in sustainable biomass refining.