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01:22Heterogeneous Catalysis
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...
01:17Thermal Electrocyclic Reactions: Stereochemistry
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
01:26Photochemical Electrocyclic Reactions: Stereochemistry
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
Selection Rules: Photochemical Activation
02:50Catalysis
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
02:52VSEPR Theory and the Basic Shapes
Overview of VSEPR Theory
02:13Energy Diagrams, Transition States, and Intermediates
Free-energy diagrams, or reaction coordinate diagrams, are graphs showing the energy changes that occur during a chemical reaction. The reaction coordinate represented on the horizontal axis shows how far the reaction has progressed structurally. Positions along the x-axis close to the reactants have structures resembling the reactants, while positions close to the products resemble the products. Peaks on the energy diagram represent stable structures with measurable lifetimes, while other...
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Efficient Electronic-Structure Methods Toward Catalyst Screening: Projection-Based Embedding Theory for CO2 Reduction
Elena Kolodzeiski1, Christopher J Stein1,2,3
1Department of Chemistry, TUM School of Natural Sciences, Technical University of Munich, Garching, Germany.
Angewandte Chemie (International Ed. in English)
|August 7, 2025
Summary
This study shows that embedding methods can accurately screen metallic catalysts for reactions like CO2 reduction. The approach balances computational accuracy and efficiency by focusing on active sites, overcoming electron delocalization challenges.
Keywords:
CO2 conversionHeterogeneous catalysisQuantum embeddingQuantum‐chemical calculationsReactivity studiesMore Related Videos
Area of Science:
- Computational Chemistry
- Materials Science
- Catalysis
Background:
- Catalyst screening requires high accuracy for predicting kinetics under operando conditions.
- Embedding methods offer a way to balance accuracy and efficiency by focusing computations on active regions.
- Applying embedding methods to metallic catalysts is challenging due to electron delocalization in conducting surfaces.
Purpose of the Study:
- To demonstrate the feasibility of simple embedding approaches for metallic catalyst screening.
- To address the challenges of electron delocalization in metallic systems using embedding methods.
- To validate the approach for CO2 reduction reaction intermediates on Cu(111).
Main Methods:
- Developed a simple embedding approach for metallic catalysts.
- Ensured consistent active orbital space across reaction coordinates.
- Utilized a nonadditive exchange-correlation functional with exact exchange to mitigate delocalization errors.
- Applied the method to CO2 reduction intermediates on Cu(111) cluster models.
Main Results:
- Demonstrated that simple embedding approaches are achievable for metallic catalysts.
- Successfully mitigated electron delocalization errors using exact exchange in the embedding potential.
- Verified the approach for various CO2 reduction intermediates on different adsorption sites.
- Showcased the potential for accurate catalyst screening with embedding methods.
Conclusions:
- Simple embedding approaches are viable for screening metallic heterogeneous (electro-)catalysts.
- The proposed method overcomes key challenges associated with electron delocalization.
- This work paves the way for more efficient and accurate computational catalyst design.