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Related Concept Videos

Catalysis02:50

Catalysis

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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.
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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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Improving Glycerol Electrooxidation Performance on Nanocubic PtCo Catalysts.

Irina Terekhina1, Mats Johnsson1

  • 1Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm SE-106 91, Sweden.

ACS Applied Materials & Interfaces
|October 14, 2024
PubMed
Summary

Noble metal catalysts, particularly platinum-cobalt nanoparticles, show high selectivity for converting glycerol into valuable C3 products via electrooxidation. Optimized Pt60Co40 catalysts demonstrated superior performance in alkaline media.

Keywords:
PtCoglycerol electrooxidationlactatenanocubesselectivity

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Green Chemistry

Background:

  • Glycerol (GLY) is a cheap platform molecule and biodiesel byproduct.
  • Glycerol electrooxidation (GEOR) is a promising conversion method.
  • Noble metal catalysts, like platinum (Pt), are stable and selective for C3 products.

Purpose of the Study:

  • Investigate cubic Pt-Co nanoparticles for GEOR.
  • Optimize catalyst composition and reaction conditions.
  • Enhance selectivity towards C3 products like lactate and glycerate.

Main Methods:

  • Synthesized cubic Pt-Co nanoparticles (Pt100Co0, Pt80Co20, Pt60Co40).
  • Evaluated catalysts in alkaline medium at 20 and 40 °C.
  • Analyzed product selectivity and reaction mechanism at different potentials (0.67 V and 0.87 V vs RHE).

Main Results:

  • Pt60Co40 exhibited superior overall performance (activity, conversion, selectivity).
  • All catalysts achieved high C3 product selectivity (up to 95%) at 0.67 V vs RHE.
  • Lactate formation favored at 0.67 V/40 °C (72% selectivity); glycerate and C-C cleavage favored at 0.87 V.

Conclusions:

  • Tuning Pt-Co composition and reaction conditions significantly impacts GEOR selectivity.
  • Pt-Co alloys are effective catalysts for producing C3 chemicals from glycerol.
  • Optimized catalysts offer a sustainable route for valorizing glycerol.