Trichloroethylene oxidative decomposition

The oxidative decomposition of binary mixtures of chlorinated VOCs (1,2-dichloroethane, dichloromethane and trichloroethylene) over H-ZSM-5 zeolite has been evaluated. The ease of destruction decreased in the order DCE>DCM>TCE. The main oxidation products were CO, CO2, HCl and CI2. Some other chlorinated by-products were detected as well (vinyl chloride, methyl chloride and tetrachloroethylene). The destruction of chlorinated mixtures induced an inhibition of the oxidation of each CVOC. An important decrease in the formation of intermediates was noticed and HCl selectivity was largely improved. 

The oxidative decomposition of trichloroethylene was also investigated in synthetic (dry air) and humid air with nonthermal plasma at atmospheric pressure, both in the absence and presence of lanthanum manganite catalyst at 150 °C [59]. In both configurations, trichloroethylene removal was enhanced... 

In the presence of aluminum, oxidative degradation or dimerization supply HCl for the formation of aluminum chloride, which catalyzes further dimerization to hexachlorobutene. The latter is decomposed by heat to give more HCl. The result is a self-sustaining pathway to solvent decomposition. Sufficient quantities of aluminum can cause violent decomposition, which can lead to mnaway reactions (1,2). Commercial grades of trichloroethylene are stabilized to prevent these reactions in normal storage and use conditions. 

The idea of using fluidized bed as both uniform light distribution and an immobilizing support for photocatalysts has been originally proposed and theoretically evaluated by Yue and Khan [3]. Experimental application of this idea has been demonstrated by Dibble and Raupp [4] who designed a bench scale flat plate fluidized bed photoreactor for photocatalytic oxidation of trichloroethylene (TCE). Recently, Lim et al. [5,6] have developed a modified two-dimensional fluidized bed photocatalytic reactor system and determined the effects of various operating variables on decomposition of NO. Fluidized bed photocatalytic reactor systems have several advantages over conventional immobilized or slurry-type photocatalytic reactors [7,8]. The unique reac-... 

Many groundwaters are contaminated with the cleaning solvents trichloroethylene (TCE) and perchloroethylene (PCE). They are two of the most common organochlorine compounds found in Superfund sites. Radiation-induced decomposition of TCE in aqueous solutions has been the subject of several recent studies [15-20]. In most of the referenced studies, the complete destruction of TCE was observed. Dechlorination by a combination of oxidative and reductive radiolysis was stoichiometric. Gehringer et al. [15] and Proksch et al. [18] have characterized the kinetics and mechanism of OH radical attack on TCE and PCE in y-ray-irradiated aqueous solution. Trichloroethylene was readily decomposed in exponential fashion, with a reported G value of 0.54 pmol J-1. A 10 ppm (76 pM) solution was decontaminated with an absorbed dose of less than 600 Gy. For each OH captured, one C02 molecule, one formic acid molecule and three Cl- ions were generated. These products were created by a series of reactions initiated by OH addition to the unsaturated TCE carbon, which is shown in Eq. (45) ... 

Senkan [45] has illustrated this latter point by means of the destruction of trichloroethylene (C2HC13) in the presence of oxygen. The reaction begins at 600-700°C. When methane is also present, however, the thermal oxidation of trichloroethylene is inhibited to such an extent that its decomposition does not begin until temperatures of about 950°C are reached. C2HC13 destruction in the presence of 02 occurs by the following reaction ... 

Yamamoto T, Chang J-S, Berezin AA, Koh-NO H, Honda S, Shibuya A (1996) Decomposition of Toluene, o-Xylene, Trichloroethylene, and their Mixture Using a Ba-T103 Packed-Bed Plasma Reactor, J. Adv. Oxid. Technol. 1, No. 1 67-78. 

The objective of this work is to evaluate the dealumination via ammonium hexafluorosilicate treatment as an effective method for enhancing the catalytic performance of H-Y zeolite for oxidative destruction of chlorinated VOC. A series of Y zeolites with various Si/Al ratios was prepared from a commercial sample, then characterised and tested for the catalytic decomposition of chlorinated VOC (1,2-dichloroethane and trichloroethylene). In general, these modified Y zeolites exhibited a higher activity with respect to that of the parent material, the zeolite subjected to 50% dealumination resulting in the most active catalyst. This increase in activity was associated with the development of strong Bronsted acidity due to dealumination. 

EPIHYDRIN ALCOHOL (556-52-5) CjHjOj The pure material or a solution in water is sensitive to moisture, light, and temperature it may polymerize when heated above room temperature. Combustible and polymerizable liquid (flash point 158°F/70°C). Reacts violently with strong oxidizers. Contact with strong acids, bases, caustics, chemically active metals (aluminum, copper, zinc, etc.), metal salts, trichloroethylene, especially in the presence of heat, can cause polymerization or exothermic decomposition. Incompatible with nitrates. Attacks some plastics, rubber, and coatings. 

CHLORO-1,2-EPOXYPROPANE (106-89-8) Forms explosive mixture with air (flash point 69°F/21°C). Contact with elevated temperatures, strong acids, strong bases, metallic halides, aluminum, aluminum chloride, iron(III) chloride, or zinc can cause explosive polymerization. Violent reaction with aniline, hypochlorite, isopropylamine, potassium tert-butoxide, sulfuric acid. Mixtures with trichloroethylene form dichloroacetylene, an explosive. Incompatible with aliphatic amines, alkaline earths, alkali metals, alkanolamines, powdered metals, strong oxidizers may cause fire and explosions. Decomposition produces highly... 

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