Ozone catalytic oxidation of adsorbed benzene over AgMn/HZSM-5 catalysts at room temperature

Yang, Liu; Li, Xiaosong; Shi, Chuan; Liu, Jinglin; Zhu, Ai‐Min; Jang, Ben W.‐L.

doi:10.1039/c3cy01102j

Cited by 39 publications

(35 citation statements)

References 36 publications

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“…[5][6][7][8][9][10][11][12][13] In this process, ozone is decomposed at low temperatures on the metal oxide surface to afford active oxygen species that are capable of oxidizing organic compounds. [19][20][21][22] We have investigated the relationship between the structures and catalytic properties of supported metal oxides. For these catalytic ozonation processes, the oxides of metals in the first transition series, such as Mn, have been mainly used as the active species.…”

Section: Introductionmentioning

confidence: 99%

Comparison of catalytic properties of supported metal oxides for benzene oxidation using ozone

Einaga

Maeda

Nagai

2015

Catal. Sci. Technol.

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Catalytic oxidation of gaseous benzene using ozone over SiO 2 -supported metal oxides (oxides of Mn, Fe, Co, Ni, and Cu) was performed at 343 K. The supported metal oxides were prepared from metal nitrates via impregnation followed by calcination at 873 K. X-ray diffraction studies revealed that aggregated metal oxides were formed on the supports. The quantities of the exposed metal oxides on SiO 2 were determined using temperature-programmed desorption of formic acid species adsorbed on the catalysts. The turnover frequencies (TOFs) for ozone decomposition and catalytic oxidation of benzene with ozone were also compared for the supported metal oxides. The TOFs for ozone decomposition with the supported metal oxides decreased in the order: Cu > Co~Ni > Fe > Mn. Conversely, the SiO 2 -supported Mn oxide (Mn/ SiO 2 ) catalyst exhibited the highest activity for catalytic oxidation of benzene with ozone and the highest efficiency for ozone utilization. FTIR studies revealed that benzene ring cleavage continuously proceeded on the Mn/SiO 2 catalyst, and oxygen-containing species, which were readily oxidized to CO 2 and CO in the presence of ozone, accumulated on the catalyst surface. The Fe-, Co-, Ni-, and Cu-oxides suffered from catalyst deactivation due to the build-up of by-product compounds, which was attributed to their low activity for oxidation of these substances. These results suggest that the most important steps in benzene oxidation with ozone on metal oxides are the formation and oxidation of by-product compounds.The higher activity of the Mn oxide catalyst for benzene oxidation is ascribed to the facile oxidation of these by-product compounds.

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Section: Introductionmentioning

confidence: 99%

Comparison of catalytic properties of supported metal oxides for benzene oxidation using ozone

Einaga

Maeda

Nagai

2015

Catal. Sci. Technol.

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“…It has been well recognized that metals possessing empty s‐orbitals and d‐orbitals containing available electrons can form strong π‐complexation bonds . Therefore, we believe the significantly enhanced adsorption capacity of Ag/AC can mainly be attributed to the stronger π‐complexation bonds formed by Ag when compared to Ce and Mn …”

Section: Resultsmentioning

confidence: 89%

Removal of chlorobenzene using a sequential adsorption–plasma catalytic system over Ag‐, Ce‐ and Mn‐modified activated carbon catalysts

Jiang

Cao

Chen

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND A dielectric barrier discharge reactor coupled with a series of activated carbon (AC) catalysts was applied to remove low concentrations of chlorobenzene. The catalysts were prepared via an impregnation method and their adsorption capacity and plasma‐catalytic ability examined in a sequential adsorption–plasma oxidation process. RESULTS Ag/AC had the longest breakthrough time and highest breakthrough capacity among the catalysts studied. At the discharge stage, the Ag/AC catalyst had the highest CO2 yield, chlorobenzene mineralization rate and carbon balance, and the lowest emission of chlorobenzene when compared with the other catalysts under the same conditions. However, the Ag/AC catalyst exhibited the worst reducing ozone generation performance, while the Mn/AC catalyst showed the best ozone decomposition ability. The organic intermediates produced using Ag/AC and Ce/AC were simpler and in lower concentrations than those formed using Mn/AC. The adsorption capacity and catalytic activity of the Ag/AC catalyst showed no obvious decrease after five cycles. Fourier transform infrared and scanning electron microscopy–energy dispersive spectroscopy analyses after the reaction showed that some nitrogen organic intermediates and chlorine substances produced via the degradation of chlorobenzene were adsorbed onto the catalyst surface. CONCLUSIONS Ag/AC exhibited a longer breakthrough time, higher breakthrough capacity, higher CO2 yield, less chlorobenzene emission and better carbon balance when compared with the other catalysts. © 2019 Society of Chemical Industry

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“…It was reported that the metals that possessed empty s-orbitals and available electrons in the d-orbitals, which could form strong p-complexation bonding [35]. Therefore, the significantly enhanced adsorption capabilities of Ag/SBA-15 and AgMn/SBA-15 catalysts could be attributed to the p-complexation adsorption with toluene on Ag [25,26].…”

Section: Toluene Adsorption Capacitymentioning

confidence: 96%

“…Recently, a new plasma system called adsorption-discharge plasma catalytic system has been developed, which could further improve the CO 2 selectivity and lower the energy cost. This system contains two operating stages, VOCs are firstly adsorbed on the surface of the porous catalysts, then degraded by plasma and catalysts [23][24][25]. Fan et al [26] reported that the energy cost of this new plasma catalytic system was extremely low.…”

Section: Introductionmentioning

confidence: 97%

Plasma-catalysis of metal loaded SBA-15 for toluene removal: Comparison of continuously introduced and adsorption-discharge plasma system

Wang

et al. 2016

Chemical Engineering Journal

104

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Ozone catalytic oxidation of adsorbed benzene over AgMn/HZSM-5 catalysts at room temperature

Abstract: Investigation of ozone catalytic oxidation of adsorbed benzene over AgMn/HZSM-5 to provide insight into plasma catalytic oxidation of adsorbed benzene in the cycled storage–discharge process.

Cited by 39 publications

References 36 publications

Comparison of catalytic properties of supported metal oxides for benzene oxidation using ozone

Comparison of catalytic properties of supported metal oxides for benzene oxidation using ozone

Removal of chlorobenzene using a sequential adsorption–plasma catalytic system over Ag‐, Ce‐ and Mn‐modified activated carbon catalysts

Plasma-catalysis of metal loaded SBA-15 for toluene removal: Comparison of continuously introduced and adsorption-discharge plasma system

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