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Thiele modulus will increase with the decrease of the size of the catalyst.

Thiele modulus will increase with the decrease of the size of the catalyst. Correct Answer False

Thiele modulus (Φ) is proportional to the square of catalyst size (R2 for spheres or b2 for flat plates), reducing the catalyst size has a more dramatic effect on Φ than changes in any other variable. It is therefore a good way to improve the reaction rate. In principle, mass-transfer limitations can be completely overcome if the particle size is decreased sufficiently.

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