Catalyst

Composition

Selectivity

Efficiency

Stability

Applications

Copper catalyst

Cu-based

High for N2

Moderate to high

Susceptible to corrosion

Water treatment, denitrification

Silver catalyst

Ag-based

High for N2

Moderate to high

Sensitive to sulfur

Antibacterial coatings, sensing

Gold catalyst

Au-based

Varies by type

Moderate to high

Highly stable

Organic synthesis, fuel cells, sensors

CuO-SnO2 catalyst

CuO-SnO2 composite

High for CO2

High

Water-resistant

Environmental remediation, catalytic oxidation

Pt-M alloy catalyst

Pt-M (M = Pd, Fe, Ni)

High for H2O

High

Relatively stable

Fuel cells, oxygen reduction