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Related Concept Videos

Flame Photometry: Lab01:16

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In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
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Related Experiment Video

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A Simple Dewar/Cryostat for Thermally Equilibrating Samples at Known Temperatures for Accurate Cryogenic Luminescence Measurements
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Measuring Local Exothermic Effects During the Oxidative Coupling of Methane Using Operando Luminescence Thermometry.

Daniël W Groefsema1, Freddy T Rabouw1,2, D Michiel Boele3

  • 1Inorganic Chemistry and Catalysis Group, Institute for Sustainable and Circular Chemistry, Department of Chemistry, Faculty of Science, Utrecht University, Utrecht, The Netherlands.

Angewandte Chemie (International Ed. in English)
|June 30, 2026
PubMed
Summary
This summary is machine-generated.

Oxidative coupling of methane (OCM) can be optimized by precisely measuring catalyst temperatures. Luminescence thermometry reveals significant temperature increases, offering insights into heat management for industrial OCM processes.

Keywords:
heat transferhigh‐temperature chemistryluminescencemethane activationoperando spectroscopy

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Area of Science:

  • Catalysis
  • Chemical Engineering
  • Materials Science

Background:

  • Oxidative coupling of methane (OCM) is a key process for methane valorization.
  • Industrialization is hindered by high temperatures, exothermicity, and low selectivity.
  • Local catalyst temperature data is scarce, limiting process optimization.

Purpose of the Study:

  • To measure local catalyst temperatures during OCM using operando luminescence thermometry (LT).
  • To investigate the influence of experimental parameters on catalyst temperature.
  • To provide insights into heat management for OCM and similar high-temperature catalytic processes.

Main Methods:

  • Operando luminescence thermometry (LT) for in-situ temperature measurement.
  • Controlled OCM reaction experiments under varying conditions.
  • Analysis of heat transfer dynamics and their effect on catalyst temperature.

Main Results:

  • Catalyst temperatures were found to exceed oven temperatures by up to 250°C.
  • Local catalyst temperature is dependent on OCM process heat generation.
  • Heat transfer and catalyst temperature are significantly influenced by experimental conditions and reactor/catalyst dimensions.

Conclusions:

  • LT is a valuable tool for measuring catalyst temperatures in high-temperature reactions.
  • Understanding heat management is crucial for optimizing OCM processes.
  • This study provides critical data for improving OCM efficiency and industrial viability.