Abstract
Multi-structured Ag/MnO2-cordierite molded catalysts were prepared by hydrothermal method and applied to the catalytic oxidation of VOCs. Catalytic activities of Ag/MnO2-cordierite were evaluated by 1000 ppm of toluene, ethyl acetate and chlorobenzene degradation respectively at the air atmosphere, and their physicochemical properties were characterized through multiple techniques containing XRD, SEM, TEM, H2-TPR and XPS. It is found that nanorod Ag/MnO2-cordierite molded catalyst showed prominent catalytic activity for VOCs decomposition and the T90 for toluene, ethyl acetate and chlorobenzene are 275 °C, 217 °C and 385 °C respectively under the space velocity of 10,000 h−1. High valence manganese oxide, more active lattice oxygen proportion and superior low-temperature reducibility were the great contributors to the high activity of the catalyst with nanorod morphology. Studies of space velocity and catalytic stability over nanorod Ag/MnO2-cordierite molded catalyst have confirmed the good catalytic performance, excellent mechanical strength and satisfied anti-toxicity to Cl at higher space velocity, which indicates that this molded catalyst have promise for industrial application.
Highlights
Volatile organic compounds (VOCs) are classified as an indispensable cause for the current atmospheric pollution[1,2]
It is easy to see that the conversion of VOCs rose with the increase of the reaction temperature, and R-Ag/MnO2-cordierite showed better catalytic activity than T-Ag/MnO2-cordierite
T90 (Temperature corresponding to the VOCs conversion of 90%) is commonly used to evaluate and compare the catalytic activity of samples
Summary
Volatile organic compounds (VOCs) are classified as an indispensable cause for the current atmospheric pollution[1,2]. The study of low-temperature, high-activity and anti-poisoning catalysts is a key to the catalytic oxidation in industrial process. The studies reported[7,12,18,19,20] so far are mostly carried out by mixing the pure powdered catalyst into the millimeter-scale quartz tube reactor through incorporating inert material such as quartz sand. They are unsuitable for actual catalytic combustion owing to incomplete reaction between www.nature.com/scientificreports/. Combined with the activity and physical property characterization results of the catalyst, the structure-activity relationship of the catalyst and the cause of the chlorine poisoning of the catalyst were investigated
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