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首页> 外文期刊>Water Science and Technology >Trimetallic Pd/Fe/Al particles for catalytic dechlorination of chlorinated organic contaminants.
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Trimetallic Pd/Fe/Al particles for catalytic dechlorination of chlorinated organic contaminants.

机译：三金属Pd / Fe / Al颗粒，用于催化氯化有机污染物的脱氯。

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摘要

Zero-valent aluminum based trimetallic particles comprising a combination of catalytically effective amounts (1 wt%) of palladium and zero-valent iron on the aluminum surface were synthesized and tested for the dechlorination of chlorinated methanes in batch reactors. XRD analysis indicated the trimetallic particles present in zero-valent form of all three components. Trimetallic Pd/Fe/Al particles showed a very rapid degradation of carbon tetrachloride leading to a surface normalized rate constant (k(SA)) of approximately 0.03 L/h/m(2), two orders of magnitude higher than that of reported data on zero-valent iron particles under near neutral pH conditions. Hydrocarbons including methane and ethane were the major products that accounted for about 38% and 27% of the carbon tetrachloride lost, respectively. Repetitive addition of carbon tetrachloride showed no loss of activity of Pd/Fe/Al particles for more than 20 cycles. In the absence of palladium, the degradation rate decreased by a factor of 10 suggesting palladium serves as a catalyst. Analysis of anions in the solution revealed that the chloride accounted for 75% of the carbon tetrachloride lost. Metallic ions for aluminum and iron were determined to be about 0.02 and 20 mg/L, respectively at the end of the experiment. No palladium ion was measured.
机译：合成了铝表面上包含催化有效量（1 wt％）的钯和零价铁的组合的零价铝基三金属颗粒，并测试了间歇反应器中氯化甲烷的脱氯作用。 XRD分析表明所有三组分的零价形式的三金属颗粒。三金属Pd / Fe / Al颗粒显示出非常快速的四氯化碳降解，导致表面归一化速率常数（k（SA））约为0.03 L / h / m（2），比报道的数据高两个数量级在接近中性pH的条件下在零价铁颗粒上包括甲烷和乙烷在内的碳氢化合物是主要产品，分别占四氯化碳损失的约38％和27％。重复添加四氯化碳显示超过20个循环，Pd / Fe / Al颗粒的活性没有损失。在不存在钯的情况下，降解速率降低了10倍，这表明钯可以用作催化剂。溶液中阴离子的分析表明，氯化物占四氯化碳损失的75％。在实验结束时，铝和铁的金属离子分别约为0.02和20 mg / L。没有测量到钯离子。

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