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A honeycomb catalyst support is manufactured by

  • A.pressing dry powder in a relatively simple steel die
  • B.machining all of the channels out of a solid block
  • C.extrusion through a die with many fine channels
  • D.slip casting the body into a complex plaster mould

Answer: C

Correct answer: extrusion through a die with many fine channels

The honeycomb is a constant section repeated along its length, which is precisely what extrusion produces. The die is an intricate assembly of feed holes and slots, and its design is the whole difficulty - the body must arrive at every part of the section at the same rate or the block distorts.

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