Why is the platinum/rhodium catalyst in automobile catalytic converters dispersed on the surface

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Why is the platinum/rhodium catalyst in automobile catalytic...

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Key Concepts

Catalyst Surface Area

Catalysts accelerate reactions by providing active sites where reactant molecules interact. Dispersing the catalyst on a high-surface-area support maximizes these active sites, which is far more effective than having the catalyst in a dense, thin film where many potentially active sites remain inaccessible.

Porous Support Materials

Using a ceramic as a support provides a porous structure that not only increases the available surface area for catalyst dispersion but also offers thermal stability under the high-temperature conditions of a catalytic converter. This support allows the precious metals to be finely distributed, optimizing their efficiency.

Cost Efficiency and Precious Metal Optimization

Platinum and rhodium are both expensive materials. By dispersing these metals on a ceramic support, the catalytic converter maximizes the number of active sites while using less material overall, leading to cost savings and more efficient resource usage.

Enhanced Reaction Kinetics

The dispersion of the catalyst on a ceramic support ensures that reactant gases have better access to the catalytic sites. This increased exposure improves the reaction rates, making the catalytic converter more effective at converting harmful emissions into less toxic substances.

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