Which statement correctly defines a heterogeneous catalyst?

Which statement correctly defines a heterogeneous catalyst?

• A. Homogeneous catalyst
• B. Heterogeneous catalyst
• C. Enzyme
• D. Inhibitor

Answer: (D)

Catalysis is categorized by the phase relationship between the catalyst and the reacting substances. A heterogeneous catalyst is a solid that speeds up a reaction when the reactants are in a different phase, typically gases or liquids, with the reaction occurring on the solid’s surface through adsorption, surface reaction, and desorption. This phase separation and surface mechanism is what sets it apart from other types of catalysts. In contrast, a homogeneous catalyst operates in the same phase as the reactants, usually in solution. An enzyme is a biological catalyst with a specific active site that accelerates reactions in living systems, not defined by being a solid surface. An inhibitor slows or stops a reaction, rather than acting as a catalyst. So the defining idea is the catalyst being in a different phase from the reactants, commonly a solid surface.

Catalysis is categorized by the phase relationship between the catalyst and the reacting substances. A heterogeneous catalyst is a solid that speeds up a reaction when the reactants are in a different phase, typically gases or liquids, with the reaction occurring on the solid’s surface through adsorption, surface reaction, and desorption. This phase separation and surface mechanism is what sets it apart from other types of catalysts. In contrast, a homogeneous catalyst operates in the same phase as the reactants, usually in solution. An enzyme is a biological catalyst with a specific active site that accelerates reactions in living systems, not defined by being a solid surface. An inhibitor slows or stops a reaction, rather than acting as a catalyst. So the defining idea is the catalyst being in a different phase from the reactants, commonly a solid surface.