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Pressure drop through a fixed bed rises steeply if the particles are made smaller, which creates

  • A.a requirement for a fluidised bed
  • B.a conflict with reducing pore diffusion
  • C.no difficulty of any kind at all
  • D.an improvement in the heat transfer only

Answer: B

Smaller particles help the chemistry and hurt the hydraulics, so the size is a compromise. Shaped catalysts such as rings and trilobes are made to improve the trade-off between the two. Particle size is always a compromise.

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