Which risk increases with a heterogeneous catalyst used in a fixed-bed reactor when the temperature exceeds a threshold?

💡 Explanation

When the temperature exceeds a threshold, particle sintering occurs due to surface diffusion accelerated by high temperatures, leading to decreased porosity and increased particle size, resulting in a higher pressure drop. Therefore, an increased pressure drop from particle sintering results, rather than poisoning, reduced selectivity or runaway reaction which operate through different processes.

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