TroubleshootingThe gas-phase reaction              A+B ⎯⎯→ C +Dis carried out in a packed-bed reactor. When the particle size wasdecreased by 15%, the conversion remained unchanged. When the particle size was decreased by 20%, the conversion decreased. When the original particle size was increased by 15%, the conversion also decreased. In all cases, the temperature, the total catalyst weight, and all other conditions remainedunchanged. What’s going on here?

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