Question

Discuss the two important aspects of solid catalysts.

Answer 1

1. Activity: The ability of a catalyst to accelerate chemical reactions, often increasing the reaction rate significantly (sometimes by up to 10^10 times). For example, platinum catalyzes the reaction between hydrogen and oxygen to form water explosively.
2. Selectivity: The ability of a catalyst to direct a chemical reaction to yield specific product(s). Different catalysts can yield different products from the same reactants, e.g., copper catalyzes ethyl alcohol to acetaldehyde, while alumina converts it to ethylene.

These aspects define the efficiency and specificity of solid catalysts in heterogeneous catalysis.