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← ScienceWhich mechanism limits reaction rate increase when using supported metal catalyst nanoparticles?
A)Metal sintering reduces surface area✓
B)Support oxidation poisons active sites
C)Mass transport limits substrate diffusion
D)Inhibition increases intermediate stability
💡 Explanation
When using supported metal catalysts, sintering (aggregation of metal nanoparticles) occurs because high temperatures promote surface diffusion and reduce the overall active surface area, slowing down reaction rates. Therefore metal sintering limits reaction increases rather than other options which involve site poisoning, mass limits, or excessive stability.
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