NDLI: Pd and Pd–Au nanocatalysts supported on exfoliated graphite for high throughput dehalogenation by nanocomposite membranes

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Environmental Science: Nano Vol - 3 Issue - 1

Environmental Science: Nano Vol -2

Environmental Science: Nano Vol -1

Pd and Pd–Au nanocatalysts supported on exfoliated graphite for high throughput dehalogenation by nanocomposite membranes

Content Provider	Royal Society of Chemistry (RSC)
Author	Crock, Christopher A. Tarabara, Volodymyr V.
Copyright Year	2016
Abstract	Exfoliated graphite nanoplatelets (xGnPs) are proposed as a support material in the design of hierarchical Pd-based nanocatalysts for reductive dehalogenation. xGnP-supported metallic (Pd) and bimetallic (Pd–Au) catalysts were synthesized and evaluated in experiments on dehalogenation of trichloroethylene (TCE) in batch and membrane reactors. The TCE removal of 96% was achieved with Pd–Au/xGnP-filled membranes operated at the specific permeate flux of 47.4 L m−2 h−1 bar−1. Normalized reactive fluxes in flow-through dehalogenation by membranes with embedded Pd–Au/xGnP and Pd/xGnP catalysts were 14.71 ± 5.96 and 2.56 ± 1.79 m s−1 MH2−1 gPd−1 gPSf, respectively. These values were ∼80 and ∼14 times higher than the normalized reactive flux obtained using membranes with embedded commercial Pd/Al2O3 catalyst. To our knowledge, this is the first report on Pd and Pd–Au catalysts on a graphene-type support for hydrodechlorination and the first demonstration of high throughput TCE dechlorination in a membrane reactor. Determined for batch reactions, the second order reaction rate constants for Pd–Au/xGnP and Pd/xGnP catalysts were 26 309 ± 6555 and 9975 ± 9506 MH2−1 s−1 gPd−1 L. These values were ∼81 and ∼31 times higher than the rate constant obtained for the commercial Pd/Al2O3 catalyst.
Starting Page	453
Ending Page	461
Page Count	9
File Format	HTM / HTML PDF
ISSN	20518153
Volume Number	3
Issue Number	2
Journal	Environmental Science: Nano
DOI	10.1039/c5en00245a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	TCE Graphite Reductive dechlorination Trichloroethylene Membrane reactor Reaction rate
Content Type	Text
Resource Type	Article
Subject	Environmental Science Materials Science

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