Catalytic destruction of hazardous halogenated organic chemicals

Lester, George R.

doi:10.1016/s0920-5861(99)00134-0

Cited by 37 publications

(25 citation statements)

References 12 publications

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“…[11,12,16] For example, Pt, Pd, and Rh/TiO 2 catalysts, which are the most active CHC-destruction catalysts reported, have a destruction rate of 0.102 g CCl 4 h À1 g À1 catalyst at 350 8C. [15] Although comparison is not easy because of the different experimental conditions used, the destruction rate of the present catalyst under study is superior to those of existing oxidation catalysts.…”

Section: Resultsmentioning

confidence: 96%

Low‐Temperature Destruction of Carbon Tetrachloride over Lanthanide Oxide‐Based Catalysts: From Destructive Adsorption to a Catalytic Reaction Cycle

Avert

Podkolzin

Manoilova

et al. 2004

Chemistry A European J

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The catalytic destruction of carbon tetrachloride in the presence of steam, CCl4 + 2 H2O→4 HCl + CO2, was investigated at 200–350 °C over a series of lanthanide (La, Ce, Pr and Nd) and alkaline‐earth metal (Mg, Ca, Sr and Ba) oxide‐based catalysts with kinetic experiments, Raman spectroscopy, X‐ray photoelectron spectroscopy, IR spectroscopy, X‐ray diffraction, and DFT calculations. This new catalytic reaction was achieved by combining destructive adsorption of CCl4 on a basic oxide surface and concurrent dechlorination of the resulting partially chlorinated solid by steam. The combination of the two noncatalytic reactions into a catalytic cycle provided a rare opportunity in heterogeneous catalysis for studying the nature and extent of surface participation in the overall reaction chemistry. The reaction is proposed to proceed over a terminal lattice oxygen site with stepwise donation of chlorine atoms from the hydrocarbon to the surface and formation of the gas‐phase intermediate COCl2, which is readily readsorbed at the catalyst surface to form CO2. In a second step, the active catalyst surface is regenerated by steam with formation of gas‐phase HCl. Depending on the reaction conditions, the catalytic material was found to transform dynamically from the metal oxide state to the metal oxide chloride or metal chloride state due to the bulk diffusion of oxygen and chlorine atoms. A catalyst obtained from a 10 wt % La2O3/Al2O3 precursor exhibited the highest destruction rate: 0.289 g CCl4 h−1 g−1 catalyst at 350 °C, which is higher than that of any other reported catalyst system.

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Section: Resultsmentioning

confidence: 96%

Low‐Temperature Destruction of Carbon Tetrachloride over Lanthanide Oxide‐Based Catalysts: From Destructive Adsorption to a Catalytic Reaction Cycle

Avert

Podkolzin

Manoilova

et al. 2004

Chemistry A European J

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“…The mounting evidence of adverse ecological and public health impacts [7] has resulted in increasingly stricter legislation to limit such emissions [8,9], which has lent an added degree of urgency to the development of robust decontamination methodologies. Established "end-of-pipe" control strategies draw on adsorption, air/steam stripping, condensation, thermal incineration, catalytic and wet air oxidation [10][11][12][13][14][15]. Incineration can result in the generation of highly toxic polychlorinated dibenzofurans/dibenzodioxins [16,17] and the primary measures in combustor design and technology to minimize the generation of "products of incomplete combustion" (PICs) cannot guarantee compliance with future legislated emissions [18].…”

Section: Introductionmentioning

confidence: 99%

Hydrodehalogenation of haloarenes over Silica supported Pd and Ni

Keane

2004

Applied Catalysis A: General

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“…The application of proper catalysts enables a decrease in a temperature of total oxidation of chloroorganic compounds to the range of 300-600ºC. Moreover, this usually enables a decrease in process costs [7][8][9][10][11][12][13]. The first aim of our investigations was to determine an effect of a temperature on catalytic oxidation efficiency of a mixture containing chloroorganic wastes, ethanol and water.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Ends From Pvc Production With Application of Fe-Cr Catalyst - Dioxins Hazard / Utylizacja Odpadu Z Produkcji Pcw Z Udziałem Katalizatora Fe-Cr W Aspekcie Zagrożenia Dioksynami

Żarczyński

Zaborowski

Gorzka

et al. 2013

Ecological Chemistry and Engineering S

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Abstract:The subject of the investigation was the model solution containing 50 g/dm³ waste light ends from PVC production, dissolved in the ethanol-water (1:1) mixture. The main components of light ends were as follows: trichloromethane, tetrachloromethane, and chloroderivatives of ethane. Granular ferric-chromic catalyst (TZC 3/1) was used in the investigation. The temperature range applied in experiments was 400-600ºC and the contact time was 0.27 s. Gaseous products of the reaction were analysed in order to determine among others concentration of chlorine, formaldehyde, oxygen, carbon monoxide and dioxins. The content of total organic carbon (TOC), chloride ions and formaldehyde was determined in a condensate. Oxidation of the mixture proceeded in the all temperature range with high efficiency in regard to initial TOC value of the solution. The concentration of dioxins in the combustion gases obtained in the process carried out in temperature 450ºC amounted to 0.021-0.027 ng TEQ/m 3 , and was significantly lower than the admissible value of 0.1 ng TEQ/m 3 . Congeners of polychlorinated dibenzofuranes (PCDFs) predominated in the combustion gases. Tested catalyst did not undergo deactivation during 150 h substrate oxidation.

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Catalytic destruction of hazardous halogenated organic chemicals

Cited by 37 publications

References 12 publications

Low‐Temperature Destruction of Carbon Tetrachloride over Lanthanide Oxide‐Based Catalysts: From Destructive Adsorption to a Catalytic Reaction Cycle

Low‐Temperature Destruction of Carbon Tetrachloride over Lanthanide Oxide‐Based Catalysts: From Destructive Adsorption to a Catalytic Reaction Cycle

Hydrodehalogenation of haloarenes over Silica supported Pd and Ni

Utilization of Ends From Pvc Production With Application of Fe-Cr Catalyst - Dioxins Hazard / Utylizacja Odpadu Z Produkcji Pcw Z Udziałem Katalizatora Fe-Cr W Aspekcie Zagrożenia Dioksynami

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