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Related Concept Videos

Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...

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Updated: Jun 27, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Enhancing CO2 reduction with formamide-Ni@TiO2 catalyst.

Wen Zhong1, Wenjing Liu2, Jingjing Du1

  • 1State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Journal of Environmental Sciences (China)
|January 24, 2025
PubMed
Summary
This summary is machine-generated.

Introducing TiO2 as a substrate significantly enhances nickel-based catalysts for electrocatalytic carbon dioxide reduction (CO2RR). FA-Ni@TiO2 shows improved performance due to better nickel atom dispersion, advancing single-atom catalyst development.

Keywords:
CondensationFormamideMetal oxidesSingle-atom catalystsTiO(2)

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Formamide condensation with nickel (Ni) generates NC structures, known catalysts for electrocatalytic CO2 reduction (CO2RR).
  • Improving the utilization efficiency of Ni atoms is crucial for enhancing catalyst performance.
  • Metal oxides can serve as substrates to modulate the growth and dispersion of catalytic species.

Purpose of the Study:

  • To investigate the effect of different metal oxide substrates on the performance of formamide-Ni (FA-Ni) catalysts for CO2RR.
  • To understand the mechanism behind the improved catalytic activity observed with specific substrates.
  • To provide insights into designing effective substrates for single-atom catalysts.

Main Methods:

  • Synthesis of formamide-Ni condensates supported on various metal oxides (TiO2, ZrO2, Al2O3, Fe2O3, ZnO).
  • Electrocatalytic CO2 reduction reaction (CO2RR) performance testing, measuring partial CO current density and turnover frequency.
  • Fourier transform infrared (FTIR) spectroscopy to analyze the adsorption mechanism of formamide on the metal oxide surfaces.

Main Results:

  • FA-Ni@TiO2 exhibited 2.8 times higher partial CO current density and Ni turnover frequency compared to unsupported FA-Ni.
  • FA-Ni@TiO2 outperformed other FA-Ni@metal oxide catalysts, including those with ZrO2, Al2O3, Fe2O3, and ZnO.
  • The enhanced performance of FA-Ni@TiO2 is attributed to doubled exposed Ni content and superior Ni atom dispersion, facilitated by formamide adsorption via its -CHO group on TiO2.

Conclusions:

  • TiO2 serves as an effective substrate for dispersing Ni atoms, leading to significantly enhanced electrocatalytic CO2RR activity.
  • The adsorption mechanism of formamide on the substrate surface dictates the dispersion of Ni atoms and subsequent catalytic performance.
  • This study highlights the importance of substrate selection in developing advanced single-atom catalysts for CO2 conversion.