Characterization and performance of SmxA1-xMnO3 (A=Ce, Sr, Ca) perovskite for efficient catalytic oxidation of toluene

• Published in: The Korean journal of chemical engineering Vol. 39; no. 11; pp. 3032 - 3038
• Main Authors: Hu, Jing, Zhou, Jiabin, Zhang, Tianlei, Liu, Su, Du, Ke
• Format: Journal Article
• Language: English
• Published: New York Springer US 2022; Springer Nature B.V
• Subjects: Biotechnology; Catalysis; Catalysts; Catalytic activity; Catalytic oxidation; Cerium; Chemical properties; Chemistry; Chemistry and Materials Science; Environmental Engineering; Fixed bed reactors; Fixed beds; Industrial Chemistry/Chemical Engineering; Low temperature; Materials Science; Oxidation; Perovskites; Sol-gel processes; Strontium; Substitution reactions; Toluene; X ray photoelectron spectroscopy; Catalytic Oxidation; SmMnO; A-site Substitution; Adsorbed Oxygen; Perovskite Catalyst
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-022-1194-0

Catalytic oxidation of toluene was implemented over SmMnO 3 , Sm 0.8 A 0.2 MnO 3 (ABO 3 , A=Ce, Sr, Ca) and Sm 1- x CaxMnO 3 (x=0.0, 0.1, 0.2, 0.3) perovskite oxides synthesized via sol-gel method. The effects of A-site substitution of SmMnO 3 and the amount of calcium substitution of SmMnO 3 perovskite-type catalyst on the catalytic activity of toluene were investigated in a fixed bed reactor. The structure and chemical properties of the perovskites were studied by XRD, SEM, XPS, and H 2 -TPR. The results showed that the substitution of Ce and Ca had a positive impact about the catalytic properties of toluene oxidation, while a negative impact was caused by the substitution of Sr. The catalytic activity of toluene oxidation followed the order of Sm 0.8 Ca 0.2 MnO 3 >Sm 0.8 Ce 0.2 MnO 3 >SmMnO 3 >Sm 0.8 Sr 0.2 MnO 3 in terms of the temperature of T 90% , at toluene concentration=1,000 ppm and weight hourly space velocity (WHSV)=3,000 mL/ g·h. Sm 0.8 Ca 0.2 MnO 3 had the highest catalytic capacity (T 90% =238 °C), which could be attributed to its high adsorbed oxygen concentration, Mn 4+ /Mn 3+ , and the best low-temperature reducibility (H 2 consumption=0.36). Meanwhile, the Sm 0.8 Ca 0.2 MnO 3 catalysts showed great long-term stability after 30 h of the reaction, and the toluene degradation rate remained over 95% at 350 °C.