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State whether the following is true or false.
Sintering of a catalyst is generally irreversible.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: B

The metal crystallites coalesce and lose surface area, and no ordinary treatment restores the dispersion. This is why the maximum operating temperature is a hard limit rather than a guideline. Crystallite growth destroys the surface area.

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