Chapter 10: Catalysis and Catalytic Reactors

Additional Homework Problems

CDP10-XB

  Reforming catalysts are used to transform normal paraffins into branched paraffins. These reactions can be written symbolically as
     
   

image 10eq42.gif

     
   

This isomerization is carried out in a moving-bed reactor containing 100 kg of a catalyst that follows first-order decay. The pressure-drop parameter at 400 K is= 9.8 x 10 -3 kg cat -1 . The entering temperature and feed rate are 400 K and 1 mol/s of pure A. Describe how you would operate (P A0 , U s , T) the bed if

(a) B were the desired product.
(b) C were the desired product.
(c) What temperature-time trajectory would you recommend for a CSTR to keepa constant?
(d) If the reactions were carried out adiabatically withimage 10eq43.gif

what changes would you recommend in part (a)?

image 10eq44.gif