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首页> 外文期刊>Catalysis Today >Hydrodechlorination of 1,2-dichloroethane on active carbon supported palladium-nickel catalysts
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Hydrodechlorination of 1,2-dichloroethane on active carbon supported palladium-nickel catalysts

机译：活性炭负载钯镍催化剂上1,2-二氯乙烷的加氢脱氯

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摘要

Two series of 2 wt.% Pd-Ni/active carbon catalysts prepared from chloride and nitrate salts were characterized by hydrogen chemisorption,temperature programmed palladium hydride decomposition and X-ray diffraction,and investigated in the hydrodechlorination of 1,2-dichloroethane in the gas phase at a relatively low reaction temperature (210-230 °C).All catalysts showed very high stability with time on stream.Ni-rich bimetallic samples exhibited the highest selectivities towards ethene (desired reaction product).Addition of palladium,the metal which is known for its high hydrogenation activity,resulted in a massive production of ethane,at the expense of ethene.The correlation between the turnover frequency towards ethene and Pd-Ni phase composition resembles very much an expected relationship between surface and bulk composition of Pd-Ni alloys.This suggests that surface nickel atoms are the active sites for hydrogen-assisted dechlorination of 1,2-dichloroethane.The overall results indicate that,in agreement with the literature,palladium segregates to the surface of Pd-Ni (even during hydrodechlorination),shaping the overall catalytic behavior of bimetallic Pd-Ni catalysts.The monometallic,2 wt.% Ni/C prepared from the chloride precursor,was the only catalyst which showed a noticeable selectivity for vinyl chloride which gradually increased with time on stream.The temperature programmed hydrogenation of deposits left after the reaction showed the presence of surface carbon and rather negligible amounts of chlorine.
机译：通过氢化学吸附，程序升温的氢化钯氢化物分解和X射线衍射对由氯化物和硝酸盐制得的2种2 wt％Pd-Ni /活性炭催化剂进行了表征，并在1,2-二氯乙烷的加氢脱氯中进行了研究。在相对较低的反应温度（210-230°C）下呈气相状态。所有催化剂均显示出在运行过程中具有很高的稳定性。富镍双金属样品对乙烯（所需的反应产物）表现出最高的选择性。钯，金属它以高氢化活性而著称，导致乙烯的大量生产，而以乙烯为代价。乙烯的转化频率与Pd-Ni相组成之间的相关性非常类似于Pd的表面与本体组成之间的预期关系-Ni合金。这表明表面镍原子是1,2-二氯乙烷进行氢辅助脱氯的活性位点。与文献一致认为，钯会偏析到Pd-Ni表面（甚至在加氢脱氯过程中），从而改变了双金属Pd-Ni催化剂的整体催化性能。由氯化物制得的2％（重量）单金属Ni / C前驱体是唯一显示出对氯乙烯选择性显着的催化剂，该选择性随生产时间的增长而逐渐增加。反应后残留的沉积物的程序升温氢化表明存在表面碳，氯含量可忽略不计。

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