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← ScienceWhich inefficiency arises when insufficient tungsten coverage results from catalyst poisoning in an ammonia synthesis reactor?
A)Increased bypass of unreacted substances✓
B)Elevated activation energy requirement
C)Decreased optimal particle size
D)Accelerated catalyst surface area decline
💡 Explanation
Poisoning reduces available active W sites, altering reactant adsorption and increasing reactant bypass of those sites; because of decreased catalysis the flow dynamics matter more, therefore unreacted substances pass through rather than lowering optimal particle size because reactions are limited to fewer sites.
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