Deactivation resistance of Pd/Au nanoparticle catalysts for water-phase hydrodechlorination

Heck, Kimberly N.; Nutt, Michael O.; Alvarez, Pedro J. J.; Wong, Michael S.

doi:10.1016/j.jcat.2009.07.015

Cited by 95 publications

(70 citation statements)

References 45 publications

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“…It should be ascribed to the reasonable loss of a small quantity of catalyst during the separation process of catalyst from reaction liquid. Meanwhile, chloride ions formed in the HDC reaction may also result in the part deactivation of Pd catalyst [27,28], which decreases the reaction rate.…”

Section: The Reuse Of the Pnipam-pd Catalyst In Hdc Reactionmentioning

confidence: 99%

Recyclable and effective Pd/poly(N-isopropylacrylamide) catalyst for hydrodechlorination of 4-chlorophenol in aqueous solution

Wang

Turhong

et al. 2015

Chemical Engineering Journal

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Section: The Reuse Of the Pnipam-pd Catalyst In Hdc Reactionmentioning

confidence: 99%

Recyclable and effective Pd/poly(N-isopropylacrylamide) catalyst for hydrodechlorination of 4-chlorophenol in aqueous solution

Wang

Turhong

et al. 2015

Chemical Engineering Journal

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“…36,[38][39][40][41][42][43][44][45][46][47][48] We previously showed that Pd metal supported on gold nanoparticles (Pd-on-Au NPs) were much more active than Pd-only catalysts. [49][50][51] These NPs exhibit a clear catalytic activity volcano dependence on Pd surface coverage (or equivalently, Pd content) for trichloroethene and perchloroethene HDC reactions. 52,53 Recent calculations indicate that the Pd-on-Au catalysts are less expensive than Pd-only catalysts, 54 and that the metal catalysis approach is no more expensive than granulated activated carbon adsorption, air-stripping, or permeable reactive barrier technologies.…”

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confidence: 99%

Chloroform hydrodechlorination behavior of alumina‐supported Pd and PdAu catalysts

et al. 2013

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SignificanceChloroform is a common groundwater contaminant that is very difficult to remove. Chemically converting it into a less toxic form through heterogeneous catalysis is an attractive approach over conventional physical removal methods if it can be done economically. In this study, we explore the efficacy of supported precious metal catalysts for chloroform hydrodechlorination. We find that Pd/Al 2 O 3 is catalytically active for this reaction (6.4 L/g Pd /min) at room temperature, atmospheric pressure, in buffered water, and in the presence of hydrogen gas, and that Pd deposited on commercial Au/ Al 2 O 3 shows activities as high as 22.4 L/g Pd /min, suggestive of some Pd metal located on top of Au domains. The primary reaction product is methane, with selectivity values exceeding 90%. Surface-enhanced Raman spectroscopy shows evidence of chloroform adsorption and dechlorination on the catalyst surface under aqueous conditions. The results highlight the potential of ambient-condition reductive catalysis to remove chloroform from water.

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“…The Pd/Ni-B catalysts exhibited preferable stability in the first four recycles from the data of reaction rate constants (k obs ), whereas quick decrease of k obs over Ni-B catalyst appeared. According to the previous studies[25,[41][42][43], catalyst deactivation was mainly due to the chemisorption of chloride onto the active sites. In our study, the addition of a small amount of NaOH can effectively neutralized the HCl formatted in the reaction and avoided the poisoning of Pd sites.…”

mentioning

confidence: 89%

“…Following his work, researchers prepared a series of bimetallic catalysts, such as Au/Ni catalysts [20,21], Pd/Fe bimetallic particles [22][23][24], Pd/Au bimetallic particles [25,26] and Pd-Ag bimetallic nanoparticles [27], among which Pd/Ni bimetallic catalysts received most of the attention. Simagina et al [28] studied the synergistic effect in Pd-Ni/C bimetallic catalysts.…”

Section: Introductionmentioning

confidence: 99%

A Highly Active Pd on Ni–B Bimetallic Catalyst for Liquid-Phase Hydrodechlorination of 4-Chlorophenol Under Mild Conditions

Sun

Mao

et al. 2011

Catal Lett

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A Pd on Ni-B (Pd/Ni-B) bimetallic catalyst was prepared and tested in the hydrodechlorination (HDC) of 4-chlorophenol (4-CP). The catalysts were synthesized by replacement method and treated at different temperatures (298-673 K). The results showed that the one treated at 473 K could achieve complete dechlorination of 200 ppm 4-CP under the pH = 8 within 30 min and keep the high activity in the first four recycles. The introducing of Pd greatly promoted the catalytic HDC efficiency of Ni-B, and the high dispersion of Pd species ensured the high activity of Pd/Ni-B catalysts. The catalytic HDC reaction of 4-CP followed the pseudo-first-order dynamics and the kinetic data was obtained.

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Deactivation resistance of Pd/Au nanoparticle catalysts for water-phase hydrodechlorination

Cited by 95 publications

References 45 publications

Recyclable and effective Pd/poly(N-isopropylacrylamide) catalyst for hydrodechlorination of 4-chlorophenol in aqueous solution

Recyclable and effective Pd/poly(N-isopropylacrylamide) catalyst for hydrodechlorination of 4-chlorophenol in aqueous solution

Chloroform hydrodechlorination behavior of alumina‐supported Pd and PdAu catalysts

A Highly Active Pd on Ni–B Bimetallic Catalyst for Liquid-Phase Hydrodechlorination of 4-Chlorophenol Under Mild Conditions

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