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A monolith catalyst is used in vehicle exhaust systems chiefly because it

  • A.costs less than a packed bed does
  • B.gives a very low pressure drop
  • C.has the highest surface area of any form
  • D.can be regenerated quite easily

Answer: B

The straight channels let the exhaust pass with little resistance, which matters greatly to engine performance. Its surface area per unit volume is lower than a packed bed and it is not cheap. Back pressure is the overriding constraint.

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