Catalytic Oxidation - A New Method for the Degradation of Pollutants in Wastewater

Abstract

Table 1. Reaction conditions of one-phase hydrosilylations. No. temperature catalyst conc. [mol-%] cristal water in catalyst co-catalyst 1a 90 C 0.45 ± ± 1b 90 C 0.10 ± ± 1c 90 C 0.10 + ± 1d 90 C 0.01 ± ± 2a RT 0.45 ± ± 2b RT 0.10 ± ± 2c RT 0.10 ± Pr i OH 2d RT 0.10 ± oxygen 2e RT 0.01 ± ± Procedure for Hydrosilylation Reactions in a Biphasic System30 ml anhydrous propylene carbonate, 30 ml n-hexane or cyclohexane, 5.94 g (30 mmol) 10-undencenoic methyl ester and 4.95 g (30 mmol) triethoxysilane were placed in an argonswept tempered (25 C and 80 C, respectively) 100 ml threenecked flask equipped with an argon tube. After the addition of 0.012 g (29 mm mol, 0.1 mol-% referring to one reaction component) anhydrous hexachloroplatinum acid the mixture was stirred for the indicated time. Procedure for Thermoregulated Catalyst Recycling20 ml anhydrous propylene carbonate, 20 ml n-hexane (or cyclohexane), 20 ml toluene, 5.94 g (30 mmol) 10-undencenoic methyl ester, 4.95 g (30 mmol) triethoxysilane and 0.012 g (29 mm mol, 0.1 mol-% referring to one reaction component) anhydrous hexachloroplatinum acid were placed in an argonswept tempered (80 C) 100 ml three-necked flask equipped with an argon tube under intensive mixing. Cooling the reaction mixture down to room temperature is accompanied by phase separation. AcknowledgementThe authors are grateful to Wacker-Chemie (Munich) and Degussa-Hüls AG (Hanau) for the donation of chemicals and as part of the ªKatalyseverbund NRWº to the Ministerium für Wissenschaft und Forschung des Landes Nordrhein-Westfalen for financial support.

Degradation of halogenated organic compounds in ground water by heterogeneous catalytic oxidation with hydrogen peroxide

“…The concentration of hydrogen peroxide was determined by titration with potassium permanganate. The formation of hydrochloric, formic and oxalic acid was followed by ion chromatography analysis (DX 100, Dionex GmbH, column: AS12A, column head pressure: 15 MPa, flow rate: 1.5 mL/min, eluant: 2.7 mM Na 2 CO 3 , 0.3 mM NaHCO 3 , conductivity cell with suppression) [13].…”