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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Radiolytic and Thermal Dehalogenation of CFC-113 Adsorbed on Molecular Sieve 13X
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Radiolytic and Thermal Dehalogenation of CFC-113 Adsorbed on Molecular Sieve 13X

机译：分子筛13X吸附的CFC-113的辐射分解和热脱卤

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摘要

The reductive dehalogenation of 1,1,2-trichloro-1,2,2-trifluoroethane (CFC-113) has been radiolytically and thermally initiated on molecular sieve 13X. The molecular sieve adsorbing CFC-113 was irradiated with #gamma#-rays or heated, and was then soaked in water. The C~- and F~- concentrations and the pH of the supernatant solutions were measured to follow the dehalogenation reaction. These values for samples irradiated at a dose rate of 7.8 kGyh~(-1) and heated at 150 dreg C were almost the same when the irradiation time was twenty-times longer thane heating time. The F~- concentration once increased and then decreased with the reaction time, whereas the Cl~- concentration increased continuously. The F~-, once produced, may be consumed with the denatured molecular sieve. When the molecular sieve adsorbing 2-propanol together with CFC-113 was irradiated, the dechlorination proceeded by a chain reaction, but the defluorination was inhibited. On the other hand, when heated in the presence of 2-propanol, both the dechlorination and the defluorination were largely suppressed. The pH of the supernatant solutions decreased from an alkaline value to a neutral or acidic one along with dehalogenation. Radiolysis of CFC-113 on activated charcoal was also examined, but the dehalogenation rates were much slower than those on the molecular sieve.
机译：1,1,2-三氯-1,2,2-三氟乙烷（CFC-113）的还原脱卤作用已通过分子筛13X进行了辐射分解和热引发。用γ射线照射或加热吸附分子筛的CFC-113，然后将其浸入水中。测量C--和F--浓度以及上清液的pH以追踪脱卤反应。当辐照时间比加热时间长二十倍时，以7.8 kGyh〜（-1）的剂量率辐照并在150 dreg C下加热的样品的这些值几乎相同。随着反应时间的增加，F〜-浓度先升高然后降低，而Cl〜-浓度则不断升高。 F-一旦产生，可与变性的分子筛一起消耗。照射吸附了2-丙醇的分子筛和CFC-113一起时，通过链反应进行了脱氯，但是抑制了脱氟。另一方面，当在2-丙醇存在下加热时，脱氯和脱氟均被大大抑制。随着脱卤作用，上清液的pH值从碱性降低到中性或酸性。还检查了活性炭对CFC-113的辐射分解，但脱卤速度比分子筛上的慢得多。

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