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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >FTIR and Reaction Kinetics Studies of the Hydrodehalogenation of CF_2Br_2,CH_2Br_2,and CD_2Br_2 over a Pd/y-Al_2O_3 Catalyst
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FTIR and Reaction Kinetics Studies of the Hydrodehalogenation of CF_2Br_2,CH_2Br_2,and CD_2Br_2 over a Pd/y-Al_2O_3 Catalyst

机译：Pd / y-Al_2O_3催化剂上CF​​_2Br_2，CH_2Br_2和CD_2Br_2加氢脱卤的FTIR和反应动力学

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摘要

A combination of FTIR and chemical reaction kinetics studies was employed to investigate the hydrodeha-logenation of CF_2Br_2,CH_2Br_2,and CD_2Br2 catalyzed by Pd/y-Al_2O_3.The products of the CF_2Br_2+H_2 reaction (CF_2H_2,CF_3H,Ci-C_3 hydrocarbons)are typical for a reaction mechanism with the participation of :CF2 and :CH_2 carbenes as the reaction intermediates.It was not possible to detect :CF_2 carbenes by FTIR during the adsorption studies.It is proposed that the carbenes are unstable on the Pd surface in the absence of H_2 and readily decompose to form carbonaceous deposits and adsorbed halogen atoms.Thus,room-temperature hydrogenation of the surface species formed during adsorption of CF_2Br_2 on Pd/y-Al_2O_3 at room temperature yields only CH_4,HBr,and HF.The :CD_2 and:CH_2 carbenes formed from dissociation of CD_2Br_2 and CH_2Br_2 adsorbed on the Pd surface are stable at room temperature,as indicated by the formation of CD_2H_2 upon hydrogenation of adsorbed species by H_2 and D_2,respectively.
机译：结合红外光谱和化学反应动力学研究了Pd / y-Al_2O_3催化CF_2Br_2，CH_2Br_2和CD_2Br2的加氢脱氢反应。CF_2Br_2+ H_2反应的产物（CF_2H_2，CF_3H，Ci-C_3烃）是典型的以：CF2和：CH_2碳烯为反应中间体的反应机理，在吸附研究中无法通过FTIR检测到：CF_2碳烯。因此，在室温下CF_2Br_2在Pd / y-Al_2O_3上吸附过程中形成的表面物质的室温氢化仅产生CH_4，HBr和HF.H_2的存在不易分解并形成碳质沉积物并吸附卤素原子。由吸附在Pd表面的CD_2Br_2和CH_2Br_2分解形成的：CD_2和：CH_2碳烯在室温下是稳定的，这是由H_2和d D_2分别。

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