Toluene oxidation by non-thermal plasma combined with palladium catalysts

Măgureanu, Monica; Dobrin, Daniela; Mandache, Nicolae Bogdan; Cojocaru, Bogdan; Pârvulescu, Vasile I.

doi:10.3389/fchem.2013.00007

Cited by 20 publications

(10 citation statements)

References 24 publications

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“…ozone [5][6][7]. The conversion, energy efficiency, carbon balance and selectivity to CO 2 are improved when plasma is coupled with a catalyst and undesired by-products such as ozone and solid deposits at walls are suppressed [8,9].…”

Section: Introductionmentioning

confidence: 99%

About the Development and Dynamics of Microdischarges in Toluene-Containing Air

Brandenburg

Jahanbakhsh

Schiorlin

et al. 2019

Plasma Chem Plasma Process

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The development of microdischarges and the inception dynamics of subsequent microdischarges in an electrode arrangement consisting of a metal pin and a hemispherical dielectric-covered electrode, operated in air with a small toluene admixture, is studied. The discharge is operated with sinusoidal high voltage. A gated ICCD camera and a current probe enable the recording of images and current pulses of the single microdischarges, respectively, while the spatio-temporally resolved development is measured with a multidimensional time-correlated single photon counting technique. The overall discharge dynamics changes significantly if a concentration of 35 ppm toluene is added to dry air. A lower high voltage amplitude than in dry air is needed for stable discharge operation. This can be explained by the lower ionization energy of toluene compared to molecular oxygen and nitrogen. The microdischarge development is the same with or without admixture, i.e. a positive (cathode directed) streamer mechanism is observed. Lower mean power is dissipated into the discharge when toluene is admixed. The main effect caused by toluene admixture is the suppression of high-energy microdischarges in case of the cathodic pin half-cycle of the sinusoidal high voltage. The influence on the inception voltage by additional ionization mechanisms and volume memory effects, the consumption of energetic electrons for toluene decomposition reactions, and the modification of the surface by plasma treatment are discussed as possible reasons.

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Section: Introductionmentioning

confidence: 99%

About the Development and Dynamics of Microdischarges in Toluene-Containing Air

Brandenburg

Jahanbakhsh

Schiorlin

et al. 2019

Plasma Chem Plasma Process

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“…However, A300 and A325 catalysts are essentially amorphous even though weak peaks were observed in the XRD pattern [ 38 ]. 19.4°, 32.5°, 37.48°, 39.3°, 45.8°, 60.7°, and 66.9° corresponded to the diffraction planes of γ-Al 2 O 3 (JCPDS 00-050-0741) [ 39 ], and 18.5°, 31.0°, 37.3°, 42.6°, 46.3°, and 67.0° matched the diffraction planes of χ-Al 2 O 3 (JCPDS 00-013-0373) [ 40 ]. Finally, the clearer γ-χ mixed phase of alumina appeared in the XRD pattern of the A350 catalyst.…”

Section: Resultsmentioning

confidence: 99%

Selective Production of Bio-Based Linear Alpha-Olefin from Wasted Fatty Alcohol on Al2O3 for Bio-Based Chemicals

et al. 2021

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The catalytic dehydration of a bio-based fatty alcohol was performed using Al2O3 prepared by solvothermal synthesis for selective production of long-chain linear-alpha-olefins (LAO). The effect of the synthesis temperature of alumina precursors on the dehydration of 1-octadecanol (C18H38O) was examined based on the textural properties and Lewis acid–base properties of the catalysts. Amorphous alumina synthesized at 325 °C showed the highest surface area (233.07 m2/g) and total pore volume (1.237 cm3/g) among the catalysts and the best dehydration results: 93% conversion, 62% selectivity of 1-octadecene (C18H36), and 89% LAO purity. This was attributed to the increased Al/O ratio and atomic concentration of surface O in alumina, which were important factors in the catalytic dehydration of 1-octadecanol through the synergistic catalysis of acid–base pairs. The produced bio-based LAO can be key intermediates for synthesis of oxo alcohols and poly-alpha-olefins, as alternatives to petroleum-based LAO to achieve carbon neutrality in chemical industry.

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“…Volatile organic compounds (VOCs) include a series of carbon-containing compounds participating in atmospheric photochemical reactions. , VOCs have relatively high vapor pressures and are therefore prone to evaporation under environmental conditions. VOCs cause air pollution, such as photochemical smog, ground ozone, sick housing syndrome, and chemical sensitivity, which is a serious threat to human health and the environment. − Toluene is a typical VOC and an aromatic hydrocarbon of benzene ring type. It comes from the process of extracting gasoline and other fuels from crude oil and turning coal into coke, which has obvious environmental hazards…”

Section: Introductionmentioning

confidence: 99%

“…VOCs cause air pollution, such as photochemical smog, ground ozone, sick housing syndrome, and chemical sensitivity, which is a serious threat to human health and the environment. 3 − 6 Toluene is a typical VOC and an aromatic hydrocarbon of benzene ring type. It comes from the process of extracting gasoline and other fuels from crude oil and turning coal into coke, which has obvious environmental hazards.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification by Amino Group Inducing for Highly Efficient Catalytic Oxidation of Toluene over a Pd/KIT-6 Catalyst

et al. 2022

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Toluene is one of the typical volatile organic compounds in industry, particularly in energy and fuels production processes, which is required to be eliminated effectively to protect the environment. Catalytic oxidation of toluene is widely studied for its high efficiency, and rational design and synthesis of metal catalysts are keys for toluene oxidation. In this study, an efficient catalyst was designed and synthesized by introducing −NH 2 groups on the ordered mesoporous silica (KIT-6) surface to anchor and disperse Pd species, leading to Pd nanoparticles being highly dispersed with uniform particle size distribution. Meanwhile, it was found that the introduction of −NH 2 made Pd centers present an electron-rich state, and the active Pd centers could activate O 2 molecules to generate more reactive oxygen species and promote the conversion of toluene, which was verified by in situ XPS and O 2 -TPD characterization. Compared with the catalysts prepared by an impregnation method, the catalytic performance of the Pd/ NH 2 -KIT-6 (0.5 wt %) catalyst was significantly improved. A conversion of 90% for toluene (2400 ppm, 24,000 mL•g −1 •h −1 ) was achieved at 171 °C, and the toluene conversion was maintained above 90% for 900 min, displaying the excellent activity and stability of the Pd/NH 2 -KIT-6 catalyst.

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Toluene oxidation by non-thermal plasma combined with palladium catalysts

Cited by 20 publications

References 24 publications

About the Development and Dynamics of Microdischarges in Toluene-Containing Air

About the Development and Dynamics of Microdischarges in Toluene-Containing Air

Selective Production of Bio-Based Linear Alpha-Olefin from Wasted Fatty Alcohol on Al2O3 for Bio-Based Chemicals

Surface Modification by Amino Group Inducing for Highly Efficient Catalytic Oxidation of Toluene over a Pd/KIT-6 Catalyst

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