Bifunctional Europium for Operando Catalyst Thermometry in an Exothermic Chemical Reaction

Abstract

Often the reactor or the reaction medium temperature is reported in the field of heterogeneous catalysis, even though it could vary significantly from the reactive catalyst temperature. The influence of the catalyst temperature on the catalytic performance and vice versa is therefore not always accurately known. We here apply EuOCl as both solid catalyst and thermometer, allowing for operando temperature determination. The interplay between reaction conditions and the catalyst temperature dynamics is studied. A maximum temperature difference between the catalyst and oven of + 16 °C was observed due to the exothermicity of the methane oxychlorination reaction. Heat dissipation by radiation appears dominating compared to convection in this set-up, explaining the observed uniform catalyst bed temperature. Application of operando catalyst thermometry could provide a deeper mechanistic understanding of catalyst performances and allow for safer process operation in chemical industries.

Photothermal Propane Dehydrogenation Catalyzed by VOx-Doped TiO2 Nanoparticles

“…The contribution from photothermal catalysis should be divided into two parts, namely, the nonthermal effect and the photoinduced heat effect. − The relationship between rates and temperature strictly obeys the Arrhenius laws . However, the relationship between rates and the nonthermal effect is still not clear.…”

“…25−27 The relationship between rates and temperature strictly obeys the Arrhenius laws. 28 However, the relationship between rates and the nonthermal effect is still not clear. As this paper focuses on the nonthermal effect on the PDH process and investigates its possible mechanism, some essential bare thermal activity and analysis are given only for the subsequent comparison between thermal and photothermal PDH.…”

Semi-quantitative determination of active sites in heterogeneous catalysts for photo/electrocatalysis

“…Therefore, it is strongly suggested to combine this technique with XPS, XAFS and other technologies for a better understanding of defect sites. Meanwhile, the recent development of in situ PL technique 116 also makes it possible to measure the defective structure (or surface temperature) of materials under reactive conditions.…”

Spotlight on Luminescence Thermometry: Basics, Challenges, and Cutting‐Edge Applications

“…LIR Air [193] LaGaO 3 :Nd 3+ NPs [194] LiYO 2 :Eu 3+ NPs [195] Energy and Catalysis [61,197,198,199]…”