Catalytic oxidation of toluene, ethyl acetate and chlorobenzene over Ag/MnO2-cordierite molded catalyst

Abstract

Multi-structured Ag/MnO 2 -cordierite molded catalysts were prepared by hydrothermal method and applied to the catalytic oxidation of VOCs. Catalytic activities of Ag/MnO 2 -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, H 2 -TPR and XPS. It is found that nanorod Ag/MnO 2 -cordierite molded catalyst showed prominent catalytic activity for VOCs decomposition and the T 90 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/MnO 2 -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.

Recent progress on catalysts for catalytic oxidation of volatile organic compounds: a review

“…The effect of various supports on the catalytic performance of loaded Ag catalysts for VOC oxidation has been investigated extensively. 190–192 For example, Zhao et al 193 synthesized the white graphene foam supported Ag catalyst, over which an excellent performance ( T 90 = 110 °C for methanol), almost half of the T 90 obtained over Ag/γ-Al 2 O 3 , was observed. The superior activity originated from the unique multilayer pore structure and the atomic thin-walled layer of white graphene foam, which favored stabilizing the supported Ag species.…”

“…The effect of various supports on the catalytic performance of loaded Ag catalysts for VOC oxidation has been investigated extensively. [190][191][192] For example, Zhao et al 193 184 Copyright 2014 American Chemical Society. (B) HCHO catalytic performance of pure SiO 2 particles and Au particles.…”

Thermal catalytic device for toluene decomposition via direct heating

“…3(a. [1][2][3] shows the morphology of a CNT element which was fabricated by coating a glass-fiber textile specimen with CNTs. CNTs are densely packed on the surface of the glass-fiber textile, as observed in the high-resolution FE-SEM image in Fig.…”

“…Recently, various studies have been conducted that explore methods to reduce fine dust as increasing fine dust concentrations in the environment have become a serious global concern. Volatile organic compounds (VOCs) are one of the main fine dust precursors and contribute significantly to the generation of fine dust [1]. VOCs are emitted by various solids and liquids in our living and working environments and high concentrations or long-term exposure pose a significant health risk [2].…”

“…VOCs are emitted by various solids and liquids in our living and working environments and high concentrations or long-term exposure pose a significant health risk [2]. Methods investigated to reduce VOCs involve adsorption [3][4][5][6], photocatalytic decomposition [7,8], catalytic oxidation [1,2,[9][10][11][12][13][14][15], and non-thermal plasma. A disadvantage of adsorption methods is the necessity for the periodic post-process treatment of spent adsorbents involving the desorption of captured VOCs or regeneration of the adsorbent [16,17].…”