Issue 2, 2016

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
08 Nov 2015
Accepted
22 Feb 2016
First published
22 Feb 2016

Environ. Sci.: Nano, 2016,3, 453-461

Author version available

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

C. A. Crock and V. V. Tarabara, Environ. Sci.: Nano, 2016, 3, 453 DOI: 10.1039/C5EN00245A

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