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← ScienceWhich outcome occurs when catalytic converter support structure experiences extreme thermal cycling?
A)Covalent bond degradation within cordierite
B)Increased precious metal nanoparticle sintering
C)Reduced sulfur dioxide conversion efficiency
D)Washcoat adhesion failure from differential expansion✓
💡 Explanation
During thermal cycling, the washcoat's repeated expansion and contraction against thermal gradients, exceeding the adhesive chemical bonds' limit, causes eventual separation because of the different expansion coefficients. Therefore, washcoat adhesion fails rather than cordierite degradation, sintering or SO2 reduction, which occur via different mechanisms and conditions.
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