Arrhenius Equation and pseudo isotherms

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SUMMARY

The discussion focuses on extracting Arrhenius parameters, specifically activation energy and frequency factor, from a reaction conducted at varying microwave powers. The experiment involves measuring the time taken for the reaction to transition from 260°C to 280°C. While one participant expresses skepticism about the feasibility of this extraction, another suggests that it may be possible under adiabatic conditions by knowing the heat released per mole of reaction and the initial reaction rate. The conversation highlights the need for precise measurements and understanding of thermodynamic principles.

PREREQUISITES
  • Understanding of the Arrhenius equation and its parameters
  • Knowledge of adiabatic reaction systems
  • Familiarity with reaction kinetics and rate measurements
  • Basic principles of thermodynamics, including heat capacity
NEXT STEPS
  • Research methods for measuring reaction rates at varying temperatures
  • Study the principles of adiabatic processes in chemical reactions
  • Learn about the calculation of activation energy using the Arrhenius equation
  • Explore techniques for measuring heat release in chemical reactions
USEFUL FOR

Chemists, chemical engineers, and researchers involved in reaction kinetics and thermodynamics, particularly those interested in microwave-assisted reactions and the application of the Arrhenius equation.

opaka
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Hey, I'm doing an experiment where I run a reaction at three different microwave powers to determine if there is any effect beyond the standard temperature ramp rates. If I know how long it takes the reaction to go from 260 C to 280 C in each of these cases, is there any possible way to extract the Arrhenius parameters? I don't think there is, but my professor is certain he's seen it done, he just can't remember how.
 
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opaka said:
Hey, I'm doing an experiment where I run a reaction at three different microwave powers to determine if there is any effect beyond the standard temperature ramp rates. If I know how long it takes the reaction to go from 260 C to 280 C in each of these cases, is there any possible way to extract the Arrhenius parameters? I don't think there is, but my professor is certain he's seen it done, he just can't remember how.
Arrhenius equation involves reaction rate, activation energy, temperature, and frequency factor. When you say Arrhenius parameter, I am assuming you want to know the activation energy and the frequency factor. You need to know the reaction rate at different temperatures.

If the entire reaction system is adiabatic, then if you know how much heat is being released (per mole of reaction), how much actually reacted (or initial reaction rate), and you know the molar heat capacity of the system (the part where you are using thermometer for), then I assume it is theoretically possible.
 

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