Palladium-catalyzed reductive dehalogenation of dissolved chlorinated aliphatics using electrolytically-generated hydrogen

Pd-catalytic hydrodechlorination of chlorinated hydrocarbons in groundwater using H2 produced by a dual-anode system

“…However, due to the limit of the aqueous solubility of H 2 (0.77 mM at 25 C and atmospheric pressure) (Speight, 2005), increasing the total current from 0.4 to 0.6 A could not further increase the dissolved H 2 concentration, and thus the hydrodechlorination efficiency. Results of the present work are consistent with a previous observation of CHC hydrodechlorination with the use of an electrolyzer for H 2 production (McNab and Ruiz, 1998).…”

“…As an alternative, in-situ production of H 2 from water electrolysis on the cathode (eq. (1)) has been proposed and tested for Pd-catalytic treatment of CHCs (McNab and Ruiz, 1998;Qian et al, 2014;Xie et al, 2013;Zheng et al, 2012). In an early research conducted by McNab and Ruiz, influent stream went through an electrolyzer first for saturating H 2 , and then passed through a Pd reactor wherein CHCs were hydrodechlorinated (McNab and Ruiz, 1998).…”

“…Nevertheless, O 2 that is proportionally produced from the anode (eq. (2)) considerably inhibited the hydrodechlorination (McNab and Ruiz, 1998), which was mainly attributed to its competition with CHCs for the active [H] on Pd surface (Lowry and Reinhard, 2001). To decrease the inhibitory effect caused by the anodic O 2 , Zheng et al arrayed the cathode and anode in a certain distance in a column, where groundwater flew through the cathode for dissolving H 2 , then the Pd catalysts for hydrodechlorination and finally the anode (Zheng et al, 2012).…”

Dechlorination of trichloroethylene in aqueous solution by noble metal-modified iron

“…Previous researches [24,[28][29][30] have indicated hydrogen plays a key role in the dechlorination reaction in the presence of Pd. The concentration of hydrogen in aqueous solution ([H 2 ] aq ) affected the TCE transformation rate and products distribution in the Pd-on-␥-Al 2 O 3 system [24,30].…”

Dechlorination of Chlorophenols Using Magnesium-Palladium Bimetallic System

“…An additional observation made by us was that the Pd 0 particles were spatially separated from the magnesium granules thereby implying that the dechlorination reaction did not necessarily occur on bimetallic interface of Pd 0 /Mg 0 as proposed by Graham and Jovanovic [17]. Hydrodehalogenation by intercalation of molecular hydrogen on various Pd 0 catalysts has been reported extensively in literatures [26][27][28]. Fig.…”