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首页> 外文期刊>Environmental Science & Technology >Palladium-Indium Catalyzed Reduction of N-Nitrosodimethylamine: Indium as a Promoter Metal
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Palladium-Indium Catalyzed Reduction of N-Nitrosodimethylamine: Indium as a Promoter Metal

机译：钯-铟催化还原N-亚硝基二甲胺：铟作为促进金属

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摘要

An emerging technology for the removal of N-nitrosodimeth-ylamine (NDMA) from drinking and groundwater is reductive destruction using noble metal catalysts and hydrogen gas as a reducing agent. Bimetallic palladium-indium (Pd-ln) supported on alumina combines the ability of Into activate NDMA with the hydrogen activating properties of Pd. This study examined the effect of In addition to a commercial 5% Pd by weight on γ-Al_2O_3 catalyst on the efficacy of NDMA reduction. The pseudo-first-order rate constant increased proportionately to In loading from 0.057 h~(-1) for 0% In to a maximum of 0.25 h~(-1) for 1% In and then decreased with additional In loading. Data suggest that hydrogen activation occurred only on Pd surfaces and In activated NDMA 20 times more effectively than Pd on a mass basis. The rate-limiting factor was NDMA activation for In loadings below 1%. The decrease at higher loadings is interpreted as In blocking pore spaces and limiting access to Pd sites, suggesting monatomic hydrogen limitation. The only products detected were dimethylamine and ammonium with carbon and nitrogen balances in excess of 92%, consistent with a mechanism involving reductive N-N bond cleavage. Results from this study serve as a basis for optimizing bimetallic catalysts for treating NDMA contaminated waters.
机译：从饮用水和地下水中去除N-亚硝基二甲胺（NDMA）的一项新兴技术是使用贵金属催化剂和氢气作为还原剂的还原性破坏。负载在氧化铝上的双金属钯铟（Pd-In）结合了In活化NDMA的能力和Pd的氢活化性能。这项研究检验了工业化5％（重量）Pd以外的γ-Al_2O_3催化剂对NDMA还原效果的影响。伪一级速率常数与In负载成比例地增加，从0％In的0.057 h〜（-1）到1％In的最大值0.25 h〜（-1），然后随着In的增加而减小。数据表明，氢活化仅发生在Pd表面，而In活化NDMA的质量比Pd有效20倍。限速因素是In负载低于1％时的NDMA活化。高载荷下的减少被解释为阻塞了孔空间并限制了Pd位点的进入，表明单原子氢的限制。唯一检测到的产物是二甲胺和铵，碳和氮的平衡超过92％，这与涉及还原性N-N键断裂的机理一致。这项研究的结果为优化用于处理NDMA污染水的双金属催化剂奠定了基础。

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