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← ScienceWhich consequence results when adsorbed hydrogen exceeds coverage limits on palladium catalysts?
A)Spontaneous surface oxide formation occurs
B)A shift in reaction selectivity transpires
C)Catalyst material recrystallization accelerates
D)Hydrogen embrittlement risk becomes elevated✓
💡 Explanation
Hydrogen embrittlement increases, because surface adsorption beyond capacity causes hydrogen atoms to diffuse into the palladium lattice, weakening grain boundaries. Therefore, structural failure risk rises rather than altering surface chemistry or material properties under normal operating temperatures.
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