Three perovskite-type catalysts prepared by citric acid method are applied to remove phenol from gas streams with the total flow rate of 300 mL/min, corresponding to a GHSV of10,000/hr. LaMnO_3 catalyst is first prepared and further partially substituted with Sr and Cu to prepare La_(0.8)Sr_(0.2)MnO_3 and La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3, and catalytic activities and fundamental characteristics of these three catalysts are compared. The results show that phenol removal efficiency achieved with La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3 reaches 100% with the operating temperature of 200°C and the rate of mineralization at 300°C is up to 100%, while the phenol removal efficiencies achieved with La_(0.8)Sr_(0.2)MnO_3 and LaMnO_3 are up to 100% with the operating temperature of 300°C and 400°C, respectively. X-ray photoelectron spectroscopy(XPS) analysis shows that the addition of Sr and Cu increases the lattice oxygen of La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3, and further increases mobility or availability of lattice oxygen. The results indicate that La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3 has the best activity for phenol removal among three catalysts prepared and the catalytic activity of phenol oxidation is enhanced by the introduction of Sr and Cu into LaMnO_3. Apparent activation energy of 48 k J/mol is calculated by Mars–Van Krevelen Model for phenol oxidation with La_(0.8)Sr_(0.2)Mn_(0.8)Cu_(0.2)O_3 as catalyst. Three perovskite-type catalysts prepared by citric acid method are applied to remove phenol from gas streams with the total flow rate of 300 mL / min, corresponding to a GHSV of 10,000 / hr. LaMnO_3 catalyst is first prepared and further partially substituted with Sr and Cu to prepare La 0.8 Sr 0.2 MnO 3 and La 0.8 Sr 0.2 Mn 0.8 Cu 0.2 O 3 and catalytic activities and fundamental characteristics of these three catalysts are compared. 100% with the operating temperature of 200 ° C and the rate of mineralization at 300 ° C is up to 100% while while the phenol Removal efficiencies achieved with La 0.8 Sr 0.2 (0.2) MnO 3 and LaMnO 3 are up to 100% with the operating temperature of 300 ° C and 400 ° C, respectively. X-ray photoelectron spectroscopy (XPS) analysis shows that the addition of Sr and Cu increases the lattice oxygen of La_ (0.8) Sr_ (0.2) Mn_ (0.8) Cu_ (0.2) O_3 and further increases mobility mobility The availability of lattice oxygen. The results indicate that La_ (0.8) Sr_ (0.2) Mn_ (0.8) Cu_ (0.2) O_3 has the best activity for phenol removal among three catalysts prepared and the catalytic activity of phenol oxidation is enhanced by the introduction of Sr and Cu into LaMnO_3. Apparent activation energy of 48 kJ / mol was calculated by Mars-Van Krevelen Model for phenol oxidation with La 0.8 0.8 Sr 0.2 Mn 0.8 Cu 0.2 O 3 as catalyst.