氢氟烃HFC－134a的分解实验研究

Study on the Decomposition of Hydroflurocarbon HFC-134a

该研究进行了氢氟烃ＨＦＣ－１３４ａ的催化分解和化学分解实验。实验结果表明无催化剂时ＨＦＣ－１３４ａ很稳定，即使升温至５００℃时也下会分解：在空气和水蒸汽存在下ＨＦＣ－１３４ａ催化分解成ＣＯ和ＣＯ＿２。ＣＦＣ－１２比ＨＦＣ－１３４ａ易分解，反应产物只有ＣＯ＿２。分解产物ＨＦ对催化剂有强烈的失活作用；超氧离子（Ｏ＿２￣－）对液相中的ＨＦＣ－１３４ａ具有很强的氧化分解能力。在常温下几乎可完全分解高浓度的ＨＦＣ－１３４ａ。

Decomposition of hydroflurocarbon HFC-134a is tested catalytically and chemically in thisstudy.Experimental results are as follows,HFC-134a is stable,not decomposed,without using cata-lyst even if rising reaction temperature up to 500℃,but decomposed to CO and CO_2 in the atmosphereof air and water vapour with using catalyst.CFC-12 is decomposed more easily than HFC-134a,and its reaction products don't contain CO.The deactivation of catalyst arises obviously from reactionproduct of HF. The superoxide ion(O_2￣-)is possessed of a strong ability to decompose HFC-134ainliquid phase. The HFC-134a in high concentration is decomposed almost completely at the ambienttemperature.