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A catalyst with very fine pores may suffer from

  • A.excessive external mass transfer to it
  • B.too high an effectiveness factor
  • C.far too little surface area on it
  • D.Knudsen diffusion limiting transport

Answer: D

When the pore is comparable with the mean free path the molecules collide with the wall more often than with each other. Wide pore supports are used where this becomes limiting. Wall collisions dominate in a fine pore.

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