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New technique developed for measurement of temperature distribution inside single catalyst particle

New technique developed for measurement of temperature distribution inside single catalyst particle
Graphical abstract. Credit: Journal of the American Chemical Society (2024). DOI: 10.1021/jacs.3c14305

Chemical reactions are usually accompanied by thermal effects, inevitably resulting in temperature changes in the reaction system. Therefore, temperature is an important parameter in reactions, which can affect chemical thermodynamics and reaction kinetics.

Precise measurement of the temperature near or at active sites inside a single catalyst particle during catalysis is important for establishing the and developing the microscopic reaction kinetics.

Recently, a research team led by Prof. Ye Mao and Prof. Liu Zhongmin from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) has developed a three-dimensional spatiotemporal-resolved technique for the measurement of temperature distribution inside a single industrial zeolite-catalyst particle.

This study was published in Journal of the American Chemical Society.

The size of zeolite catalyst particles used in typical industrial processes is generally tens to hundreds of microns. However, the currently used thermocouples and infrared thermal imaging can only measure the surface temperature of the catalyst, and the spatial resolution is in millimeters.

To solve this problem, the researchers developed an with a of 800 nm, realizing the dynamic measurement of the three-dimensional spatiotemporal distribution of temperature inside the industrial zeolite catalyst particle during the methanol-to-olefins (MTO) reactions.

They developed this up-conversion confocal microscopic imaging technique by implanting the up-conversion nano-thermometer with high-temperature resistance into industrial zeolite catalyst particles using a microfluidic chip.

Furthermore, the researchers developed multimodal imaging techniques, i.e., confocal fluorescence and confocal infrared microscopy, and investigated the effects of zeolite contents and particle size on the spatiotemporal distribution of temperature inside the catalyst particles. They revealed the utilization of and the evolutions of reaction intermediates during MTO reactions affected by heterogeneous temperature distribution.

"This technique provides a new path to understand the in catalyst particles toward the rational design and optimization of industrial catalysts and catalysis," said Prof. Ye.

More information: Yu Tian et al, Spatiotemporal Heterogeneity of Temperature and Catalytic Activation within Individual Catalyst Particles, Journal of the American Chemical Society (2024). DOI: 10.1021/jacs.3c14305

Citation: New technique developed for measurement of temperature distribution inside single catalyst particle (2024, March 5) retrieved 18 April 2024 from https://phys.org/news/2024-03-technique-temperature-catalyst-particle.html
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