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Received December 14, 2021
Accepted May 30, 2022
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Characterization and performance of SmxA1-xMnO3 (A=Ce, Sr, Ca) perovskite for efficient catalytic oxidation of toluene
School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China 1Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
jbzhou@swpu.edu.cn
Korean Journal of Chemical Engineering, November 2022, 39(11), 3032-3038(7), 10.1007/s11814-022-1194-0
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Abstract
Catalytic oxidation of toluene was implemented over SmMnO3, Sm0.8A0.2MnO3 (ABO3, A=Ce, Sr, Ca) and Sm1-xCaxMnO3 (x=0.0, 0.1, 0.2, 0.3) perovskite oxides synthesized via sol-gel method. The effects of A-site substitution of SmMnO3 and the amount of calcium substitution of SmMnO3 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 H2-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 Sm0.8Ca0.2MnO3>Sm0.8Ce0.2MnO3>SmMnO3>Sm0.8Sr0.2MnO3 in terms of the temperature of T90%, at toluene concentration=1,000 ppm and weight hourly space velocity (WHSV)=3,000mL/ g·h. Sm0.8Ca0.2MnO3 had the highest catalytic capacity (T90%=238 ℃), which could be attributed to its high adsorbed oxygen concentration, Mn4+/Mn3+, and the best low-temperature reducibility (H2 consumption=0.36). Meanwhile, the Sm0.8Ca0.2MnO3 catalysts showed great long-term stability after 30 h of the reaction, and the toluene degradation rate remained over 95% at 350 ℃.
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