Catalytic oxidation of butyl acetate over silver-loaded zeolites

Wong, Cheng Teng; Abdullah, Ahmad Zuhairi; Bhatia, Subhash

doi:10.1016/j.jhazmat.2008.01.012

Cited by 78 publications

(45 citation statements)

References 20 publications

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“…Baek et al [18] studied various transition metals, e.g., Mn, Fe, Co, Ni, Cu, Zn, and Ag for the catalytic oxidation of toluene and methyl ethyl ketone and found that silver showed the best activity among the tested catalysts. Wong et al [19] reported that silver-loaded zeolite (HY and HZSM-5) catalysts exhibited high activities for the oxidation of butyl acetate. It was also shown that the addition of silver to LaMnO 3 perovskite significantly improved the catalyst activity and selectivity for the combustion of VOCs [20].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Combustion of Toluene over a Copper‐Manganese‐Silver Mixed‐Oxide Catalyst Supported on a Washcoated Ceramic Monolith

Zhou

Jiang

et al. 2009

Chem Eng & Technol

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Monolithic catalysts were prepared by washcoating an alumina sol and then impregnating Cu-Mn-Ag mixed oxides onto cordierite substrates. The effects of the preparation parameters including the Ag/Cu/Mn ratio, the total amount of active phase and the loading of washcoat, and the reaction conditions, e.g., the space velocity and the oxygen/toluene ratio on the catalytic performance for the combustion of toluene were investigated. It is shown that the Cu-Mn-Ag oxides are very active for the combustion of toluene and that the highest catalytic activity is achieved over a monolithic catalyst containing 14.7 wt % of washcoat and 21.2 wt % of active phase with a Ag/Cu/Mn molar ratio of 13.8/43.1/43.1. It is also seen that the optimum catalyst has a good catalytic stability and exhibits an excellent activity not only at a rather high space velocity but also within a wide range of oxygen/toluene ratios.

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Section: Introductionmentioning

confidence: 99%

Catalytic Combustion of Toluene over a Copper‐Manganese‐Silver Mixed‐Oxide Catalyst Supported on a Washcoated Ceramic Monolith

Zhou

Jiang

et al. 2009

Chem Eng & Technol

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“…OSDEMP molecule contains bivalent sulfur atom that possesses two lone pairs of electrons. At first, slight amounts of deionized water in a 5:1 (v/v) ratio were added to OSDEMP samples to activate Bronsted acid sites over the surface of nanocomposite and to accelerate the Richter et al 2002;Wong et al 2008). Both Bronsted and Lewis approaches are involved in the surface activity of the typical MnO 2 -AgY nanocomposite.…”

Section: Mechanism Of the Decontamination Proceduresmentioning

confidence: 99%

“…Cation Ag ? as a significant reagent is applied in many catalytic procedures (Huang 1974;Qi et al 2007;Wong et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Silver possesses a strong affinity to complex with sulfur-containing ligands and the contact between zeolite with a silver content ranging between 10 and 40 wt/wt% and the pesticide is persistent for a period of 1 min to 60 days at a temperature range of -30 to 50°C (Bartram and Wagner 2003). The ion exchange process promotes better Ag dispersion down to nearly molecular level (Wong et al 2008). In this case, Ag ?…”

Section: Introductionmentioning

confidence: 99%

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Manganese dioxide nanoparticles-silver-Y zeolite as a nanocomposite catalyst for the decontamination reactions of O, S-diethyl methyl phosphonothiolate

Dastafkan

Sadeghi

Obeydavi

2014

Int. J. Environ. Sci. Technol.

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The decontamination reactions of O,S-diethyl methyl phosphonothiolate, as an agricultural organophosphorous pesticide onto 20 wt% loaded manganese dioxide nanoparticles-silver-Y zeolite as a nanocomposite catalyst in different solvents, were evaluated and monitored by means of gas chromatography-flame ionization detector and gas chromatography-mass spectrometry. Prior to the reaction, the catalyst was synthesized in three steps: at first, sodium-Y zeolite was prepared by hydrothermal method; then, silver-Y zeolite was prepared from sodium-Y zeolite using ion exchange procedure; and finally, manganese dioxide nanoparticles were synthesized by in situ impregnation method by pouring the pre-prepared silver-Y zeolite into manganese(II) nitrate solution and loaded as 20 wt% onto silver-Y zeolite structure. The formation of the synthesized units and final nanocomposite catalyst was verified through scanning electron microscopy, X-ray diffraction, atomic absorption spectrometry and Fourier transform-infrared spectroscopy techniques. Gas chromatography chromatograms showed that O,S-diethyl methyl phosphonothiolate was decontaminated perfectly by the catalyst in n-heptane solvent after 8 h, at room temperature, while chloroform and isopropanol solvents and other reaction times gave lower decontamination results. Moreover, gas chromatography-mass spectrometry chromatograms confirmed the formation of ethyl methyl phosphonic acid as a major and final product, which exemplifies the role of hydrolysis reaction during the degradation progress.

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“…10-11 ZSM-5 is a type of common zeolites, which has been exhibited excellent catalytic activities. [12][13][14][15][16][17] VOCs are usually emitted in mixture to nature; however, there are few articles about their treatment under this form. The different studies agree on the fact that VOC catalytic oxidation in mixture differs from its simple oxidation.…”

Section: Introductionmentioning

confidence: 99%

Gas Phase Oxidation of Toluene and Ethyl Acetate over Proton and Cobalt Exchanged ZSM-5 Nano Catalysts- Experimental Study and ANN Modeling

Hosseini¹,

Niaei²,

Salari³

et al. 2010

Bulletin of the Korean Chemical Society

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Activities of nanostructure HZSM-5 and Co-ZSM-5 catalysts (with different Co-loading) for catalytic conversion of ethyl acetate and toluene were studied. The catalysts were prepared by wet impregnation method and were characterized by XRD, BET, SEM, TEM and ICP-AES techniques. Catalytic studies were carried out inside a U-shaped fixed bed reactor under atmospheric pressure and different temperatures. Toluene showed lower reactivity than ethyl acetate for conversion on Co-ZSM-5 catalysts. The effect of Co loading on conversion was prominent at temperatures below 400 o C and 450 o C for ethyl acetate and toluene respectively. In a binary mixture of organic compounds, toluene and ethyl acetate showed an inhibition and promotional behaviors respectively, in which the conversion of toluene was decreased at temperatures above 350 o C. Inhibition effect of water vapor was negligible at temperatures above 400 o C. An artificial neural networks model was developed to predict the conversion efficiency of ethyl acetate on Co-ZSM-5 catalysts based on experimental data. Predicted results showed a good agreement with experimental results. ANN modeling predicted the order of studied variable effects on ethyl acetate conversion, which was as follows: reaction temperature (50%) > ethyl acetate inlet concentration (25.085%) > content of Co loading (24.915%).

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Catalytic oxidation of butyl acetate over silver-loaded zeolites

Cited by 78 publications

References 20 publications

Catalytic Combustion of Toluene over a Copper‐Manganese‐Silver Mixed‐Oxide Catalyst Supported on a Washcoated Ceramic Monolith

Catalytic Combustion of Toluene over a Copper‐Manganese‐Silver Mixed‐Oxide Catalyst Supported on a Washcoated Ceramic Monolith

Manganese dioxide nanoparticles-silver-Y zeolite as a nanocomposite catalyst for the decontamination reactions of O, S-diethyl methyl phosphonothiolate

Gas Phase Oxidation of Toluene and Ethyl Acetate over Proton and Cobalt Exchanged ZSM-5 Nano Catalysts- Experimental Study and ANN Modeling

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