%0 Journal Article
%T Dechlorination Mechanisms of Chlorinated Hydrocarbons by Supported Nanoscale Pd/Fe<br>负载型纳米Pd/Fe对氯代烃脱氯机理研究
%A LI Zhi-ling
%A YANG Qi
%A SHANG Hai-tao
%A XI Hong-bo
%A HAO Chun-bo
%A <br>李智灵
%A 杨琦
%A 尚海涛
%A 席宏波
%A 郝春博
%J 环境科学
%D 2008
%I 
%X Some volatile chlorinated hydrocarbons such as VC, 1,1-DCE, TCE, PCE, gamma-HCH, were dechlorinated by synthesized supported nanoscale Pd/Fe. The dechlorination reactions of PCE, TCE, 1,1-DCE, VC, gamma-HCH follow the pseudo-frist order kinetics equations with the k(obs) of 2.79 h(-1), 2.35 h(-1), 1.12 h(-1), 2.14 h(-1) and 4.02 h(-1) respectively. Little or no medial products were detected and the main end products were C2H6 and C2H4 during the dechlorination of VC, 1,1-DCE, TCE, PCE. The total carbon ratio of C2H6 and C2H4 were 70% and 10% respectively during the dechlorination of TCE. The supported nanoscale Pd/Fe particles after exposed to air for 24 h were used for 8 cycle experiments and the results indicate that the particles have favorable stability. The reactivity has no obvious decrease after 200 hours' successive dechlorination experiments of gamma-HCH which indicates that the particles represent good durability. The reaction activation energy of all the chlorinated hydrocarbons are bigger than 29 kJ x mol(-1) which shows that the surface-chemical reaction rather than diffusion is the rate-limiting step in the metal-mediated dechlorination process. A consistence between the experimental data and simulated curves indicates that the muti-step reaction pathways proposed offer a better explanation of the reaction mechanisms than sequential hydrogenolysis reactions in the transformation of chlorinated hydrocarbons by supported nanoscale Pd/Fe.
%K supported nanoscale Pd/Fe
%K rate constant kobs
%K activation energy
%K dechlorination simulation<br>负载型纳米Pd/Fe
%K 表观速率常数kobs
%K 活化能Ea
%K 脱氯路径模拟
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=A24FEA2E18796B7704D4C1BEF1DB75FC&yid=67289AFF6305E306&vid=771469D9D58C34FF&iid=E158A972A605785F&sid=32491EEEE0A8C927&eid=CEA1F7DC6B978724&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=21