Aqueous bromate reduction by catalytic hydrogenation over Pd/Al2O3 catalysts

Chen, Huan; Xu, Zhaoyi; Wan, Haiqin; Zheng, Jianzhong; Yin, Daqiang; Zheng, Shourong

doi:10.1016/j.apcatb.2010.02.021

Cited by 164 publications

(127 citation statements)

References 42 publications

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“…The electroreduction rate of BrO 3 − remains around 0.031 min −1 when pH is increased from 2.09 to 9.88, reflecting a stable electrocatalytic activity of the Pd/C electrode with a wide pH range. The different electroreduction behavior with various pH ranges indicated that the electroreduction of BrO 3 − proceed with a different reduction process at -2.0 V. The similar strong dependence of BrO 3 − reduction on pH value was observed by Kishimoto et al and Chen et al [20,38]. They pointed out that low solution pH can accelerate the BrO 3 − removal.…”

Section: Effect Of Solution Phsupporting

confidence: 59%

Electrochemical Reduction of Bromate by a Pd Modified Carbon Fiber Electrode: Kinetics and Mechanism

Mao

Zhao

2014

Electrochimica Acta

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a b s t r a c tThe electroreduction of bromate (BrO 3 − ) was investigated at a Pd modified carbon fiber (Pd/C) electrode prepared from PdCl 2 via electrodeposition method. Pd particles distributed on the carbon fiber substrate uniformly. Under various cathode potentials, electroreduction removal of BrO 3 − at pure carbon fiber electrode and the Pd/C electrode were firstly compared. It was observed that nearly no BrO 3 − removal was observed within the bias potential of -2.0 V at the carbon fiber electrode. At the Pd/C electrode, the removal efficiency of BrO 3 − was sharply increased from 24.0% to 58.4% at the cathode potential of -1.0 to -1.5 V, which was further increased to be 87.2% at -2.0 V. The electrochemical reduction of BrO 3 − was strongly pH-dependent at -0.5 V and the reduction rate could be enhanced at low pH. While at the potential of -2.0 V, a slight pH effect was observed. BrO 3 − electroreduction follows pseudo first-order kinetics; the rate constant k was firstly increased from 0.016 to 0.031 min −1 with the increase of the Pd loading amount from 0.31 to 0.73 mg/cm 2 , and then was decreased to 0.018 min −1 at a higher Pd loading amount of 1.05 mg/cm 2 . The Pd(0) nanoparticles played a significant role in forming atomic H* to realize indirect BrO 3 − reduction. The electrochemical reduction of BrO 3 − produces accumulated intermediates of HOBr and OBr − , which were subsequently reduced to Br − with the time evolution.

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Section: Effect Of Solution Phsupporting

confidence: 59%

Electrochemical Reduction of Bromate by a Pd Modified Carbon Fiber Electrode: Kinetics and Mechanism

Mao

Zhao

2014

Electrochimica Acta

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“…1(a), diffraction peaks at 40.1 , 46.7 and 68.1 assigned to the face centered cubic (fcc) crystallographic structure of metallic Pd were observed for the Pd/Al 2 O 3 catalyst [27,28], and the peak at 40.1 shifts slightly to lower angle at 39.2 for Pd-In/ Al 2 O 3 catalysts, related to the formation of the Pd-In bimetallic alloy [29]. The dark spots in the TEM picture ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Reductive dechlorination of trichloroacetic acid (TCAA) by electrochemical process over Pd-In/Al2O3 catalyst

Liu

Mao

Yating

et al. 2017

Electrochimica Acta

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A B S T R A C TElectrochemical reduction treatment was found to be a promising method for dechlorination of Trichloroacetic acid (TCAA), and acceleration of electron transfer or enhancement of the concentration of atomic H* significantly improve the electrochemical dechlorination process. Bimetallic Pd-based catalysts have the unique property of simultaneously catalyzing the production of atomic H* and reducing target pollutants. Herein, a bimetallic Pd-In electrocatalyst with atomic ratio of 1:1 was evenly deposited on an Al 2 O 3 substrate, and the bimetallic Pd-In structure was confirmed via X-ray photoelectron spectroscopy (XPS). Electrochemical removal of trichloroacetic acid (TCAA) by the PdIn/Al 2 O 3 catalyst was performed in a three-dimensional reactor. 94% of TCAA with the initial concentration of 500 mg L À1 could be degraded within 30 min under a relatively low current density (0.9 mA cm À2 ). In contrast to the presence of refractory intermediates (dichloroacetic acid (DCAA)) found in the Pd/Al 2 O 3 system, TCAA could be thoroughly reduced to monochloroacetic acid (MCAA) using Pd-In/ Al 2 O 3 catalysts. According to scavenger experiments, an electron transfer process and atomic H* formation function both existed in the TCAA reduction process, and the enhanced indirect atomic H* reduction process (confirmed by ESR signals) played a chief role in the TCAA removal. Moreover, the synergistic effects of Pd and In were proven to be able to enhance both direct electron transfer and indirect atomic H* formation, indicating a promising prospect for bimetallic electrochemical reduction treatment.

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“…Zhao et al (2014) reported that the electrocatalytic reduction of haloacetic acids (HAAs) on the Pd-modified carbon electrode would be enhanced by increasing the initial HAAs concentration. Chen et al (2010) found that increasing initial BrO 3 À concentration from 0.08 to 0.39 mM led to the increase of the initial BrO 3 À reduction rate from 2.8 to…”

Section: Effects Of Initial Bro 3 à Concentration and Dissolved Organmentioning

confidence: 99%

Graphene-modified Pd/C cathode and Pd/GAC particles for enhanced electrocatalytic removal of bromate in a continuous three-dimensional electrochemical reactor

et al. 2015

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Aqueous bromate reduction by catalytic hydrogenation over Pd/Al2O3 catalysts

Cited by 164 publications

References 42 publications

Electrochemical Reduction of Bromate by a Pd Modified Carbon Fiber Electrode: Kinetics and Mechanism

Electrochemical Reduction of Bromate by a Pd Modified Carbon Fiber Electrode: Kinetics and Mechanism

Reductive dechlorination of trichloroacetic acid (TCAA) by electrochemical process over Pd-In/Al2O3 catalyst

Graphene-modified Pd/C cathode and Pd/GAC particles for enhanced electrocatalytic removal of bromate in a continuous three-dimensional electrochemical reactor

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