Transcription of CHAPTER 7: Fixed-Bed Catalytic ReactorsI - UCSB College of ...
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CHAPTER 7: Fixed-Bed Catalytic ReactorsI - UCSB College of ...
CHAPTER 7: Fixed-Bed Catalytic Reactors ICopyright 2022 by Nob Hill Publishing, LLCIn a Fixed-Bed reactor the catalyst pellets are held in place and do not move withrespect to a fixed reference and energy balances are required for both the fluid, which occupies theinterstitial region between catalyst particles, and the catalyst particles, in which thereactions following figure presents several views of the Fixed-Bed reactor. The speciesproduction rates in the bulk fluid areessentially zero. That is the reason we areusing a / 161 CHAPTER 7: Fixed-Bed Catalytic Reactors IICopyright 2022 by Nob Hill Publishing, LLCBAcjsDCcjcjTR T cjFigure : Expanded views of a Fixed-Bed / 161 The physical pictureEssentially all reaction occurs within the catalyst particles. The fluid in contact withthe external surface of the catalyst pellet is denoted with we need to discuss both fluid and pellet concentrations and temperatures, weuse a tilde on the variables within the catalyst / 161 The steps to considerDuring any Catalytic reaction the following steps occur:1transport of reactants and energy from the bulk fluid up to the catalyst pelletexterior surface,2transport of reactants and energy from the external surface into the
3 adsorption, chemical reaction, and desorption of products at the catalytic sites, 4 transport of products from the catalyst interior to the external surface of the pellet, and 5 transport of products into the bulk uid. The coupling of transport processes with chemical reaction can lead to concentration and
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