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Öğe Catalyst preparation and testing for catalytic combustion of chloromethanes(Springer, 2002) Atalay, S; Alpay, HE; Atalay, FS; Derouane, EG; Parmon, V; Lemos, F; Ribeiro, FRThe catalytic combustion of methylenechloride, carbontetrachloride, and chloroform, three of the chloromethanes, was investigated on metal oxide catalysts prepared on the monolith support or on the spherical alumina pellets. The prepared catalysts were tested for methylenechloride and carbontetrachloride at the different temperatures and at varying GHSV values with an excess air ratios of 216% and 3100%, respectively. The catalyst having the composition of 15% Cr2O3, 5% Ce2O3 and 80% gamma-Al2O3 on the monolith was found to be ultimate due to the complete destruction of methylenechloride and to the highest mechanical stability. The operating conditions were proposed as 77778 h(-1) for the GHSV, 216% for the excess air and 400-500degreesC for the temperature range to combust methylenechloride completely. However the catalyst with a different active part composition (18% Cr2O3, 2% Ce2O3) satisfied nearly complete destruction of carbontetrachloride. The operating conditions were 5702 h(-1) for the GHSV, 3100% for the excess air ratio and 800degreesC for the temperature to combust carbontetrachloride. The catalytic oxidation of chloroform was investigated by the catalyst having the composition of 18% Cr2O3, 2% of Ce2O3 on monolith. The excess air was kept at a value of 4077%. The reactor temperature was changed between 200 and 300degreesC.Öğe Catalytic combustion of carbon tetrachloride(Elsevier Science Bv, 2002) Tanilmis, T; Atalay, S; Alpay, HE; Atalay, FSThe catalytic combustion of carbon tetrachloride (CCl4) by metal oxide catalysts coated on the monolith support was investigated. The prepared catalysts were tested at temperatures between 300 and 800degreesC and at varying gas hourly space velocity (GHSV) values with an excess air ratio of 3100%. The catalyst, whose composition was 18% Cr2O3, 2% Ce2O3 and 80% gamma-Al2O3, was found to almost completely oxidize CCl4. The operating conditions proposed are 5702h(-1) for GHSV, 3100% excess air and a temperature slightly higher than 800degreesC. The reaction rate expression was found to be independent of oxygen partial pressure but strongly dependent on CCl4 partial pressure. (C) 2002 Elsevier Science B.V. All rights reserved.Öğe Catalytic combustion of carbontetrachloride(Battelle Press, 1998) Atalay, S; Tanilmis, T; Alpay, HE; Atalay, FS; Wickramanayake, GB; Hinchee, REThe catalytic combustion of carbontetrachloride was investigated on metal oxide catalysts coated on the monolith support. The prepared catalysts were tested at the different temperatures between 300 and 800 degrees C and the varying GHSV values with an excess air ratio of 3100%. The catalyst, having the composition of 18% Cr2O3, 2% Ce2O3 and 80% gamma-Al2O3, was found to be suitable for the almost complete destruction of carbontetrachloride. The operating conditions were proposed as 5702 h(-1) for GHSV, 3100% for the excess air. The temperature should be slightly higher than 800 degrees C. The reaction rate expression was found to be independent of oxygen partial pressure and strongly dependent on carbontetrachloride partial pressure.Öğe Catalytic combustion of methylenechloride(Gordon Breach Sci Publ Ltd, 1996) Ballikaya, M; Atalay, S; Alpay, HE; Atalay, FSThe catalytic combustion of methylenechloride, one of the chloromethanes, was investigated on metal oxide catalysts coated on the monolith support or on the spherical alumina pellets. The prepared catalysts were tested at the different temperatures between 200 and 500 degrees C and at varying GHSV values with an excess air of 216%. The catalyst having the composition of 15% Cr2O3, 5% Ce2O3 and 80%gamma-Al2O3 on the monolith was found to be ultimate due to the complete destruction of methylenechloride and to the highest mechanical stability. The operating conditions were proposed as 77778 h(-1) for the GHSV, 216% for the excess air and 400-500 degrees C for the temperature range to combust methylenechloride completely. The dependency of the reaction on methylenechloride and oxygen partial pressures was searched, and it was determined that the rate was strongly dependent on oxygen partial pressure and weakly methylenechloride partial pressure. The reaction rate expression was derived using the mechanism proposed by Downie and the reoxidation and reduction rate constants of the reaction were found as: k(i) = 4.422 x 10(-5)exp(-12597.5/RT) K-0 = 2.901 x 10(-6)exp(-4552.5/RT).Öğe Gebelerin pasif içiciliğin fetüs ve yeni doğan sağlığına etkileri konusundaki bilgileri(2014) Atalay, S; Dağhan, Şafak; Kalkım, Aslı…Öğe Kinetics of Acetaldol Production(Vch Publishers Inc, 1991) Atalay, Fs; Atalay, SÖğe Kinetics of liquid phase selective hydrogenation of methylacetylene and propadiene in C-3 streams(Soc Chemical Eng Japan, 1998) Uygur, H; Atalay, S; Savasci, TOA study was made of kinetic parameters of methylacetylene (MA) and propadiene (PD) selective hydrogenation in liquid phase. C-3 cut, produced by naphtha steam cracking, contains 93.5 wt% propylene, 3.5 wt% propane, 2.5 wt% MAPD and lighter hydrocarbons. MA and PD are unwanted for the propylene conversion processes in the downstream plants and are removed by converting them to propylene itself. For this purpose, a palladium based commercial catalyst was used in a lab scale trickle-bed reactor, in the temperature range of 20-50 degrees C and in the WHSV range of 70-110 h(-1), at 2.53 MPa. It was found that MAPD conversion to propylene decreases as temperature and WHSV increase. In the reaction mixture, propylene itself also reacts to give propane. However, propylene conversion remains nearly constant in different WHSV and temperature values. Rate equations for MA, PD and propylene conversions were obtained by using experimental results. Kinetic parameters were calculated by taking into consideration external and internal mass transfer resistances.Öğe Kinetics of the Air Oxidation of 1,2-Dichlorobenzene(Amer Chemical Soc, 1987) Atalay, S; Alpay, HeÖğe Modeling of a Fixed-Bed Reactor For the Air Oxidation of 1,2-Dichlorobenzene(Vch Publishers Inc, 1987) Atalay, S; Alpay, HeÖğe Treatment of an alkaloid industry wastewater by biological oxidation and/or chemical oxidation(Taylor & Francis Inc, 2004) Aytimur, G; Atalay, SThe treatment of high strength alkaloid industy wastewater was carried out by biological and chemical oxidation and by the appropriate combinations of them. As a biological treatment, activated sludge, and as a chemical treatment, catalytic wet air oxidation (CWAO), processes were used. In biological process, the effects of retention time (4, 6, 8 days) and air flowrate (3, 4.5 L/min) were tested and 6 days of retention time, 4.5 L/min air flowrate were decided to be appropriate operating conditions. In CWAO process, effects of temperature (140, 150, 160degreesC) and catalyst loading (0.5, 1 g/L) were tested. The optimum temperature and catalyst loading were found to be 150degreesC and 1g/L, respectively. In combined processes, biologically treated wastewater was subjected to CWAO and also chemically oxidized wastewater was subjected to the biological treatment. Combinations of both processes seemed not so effective. Biological treatment alone was sufficient.
