4 years ago

Polymer-based spherical activated carbon as catalytic support for hydrodechlorination reactions

Polymer-based spherical activated carbon as catalytic support for hydrodechlorination reactions
In this work, polymer-based spherical activated carbon (PBSAC) (dp=500μm) has been used as support to synthesize several Pd/PBSAC (1%wt.) catalysts. These catalysts have been tested in the hydrodechlorination (HDC) of 4‐chlorophenol (4-CP) in aqueous phase under ambient-like conditions (30°C, 1atm) at [4-CP]0 =3.9mmolL−1; [catalyst]0 =1gL−1 and 50NmL H2 min−1. A sequential calcination (200°C, air atmosphere) − reduction (80°C, H2 atmosphere) treatment was required to obtain active HDC catalysts with a convenient proportion of zero-valent and electrodefficient Pd species. This catalyst allowed to achieve complete conversion of 4-CP in 90min reaction time, giving rise to phenol as main reaction product. An expanded kinetic model accounting for both consecutive reaction and sorption processes was used to successfully fit the experimental data. The values obtained for the effective rate constant of 4-CP disappearance (3.26–10.88×10−4 s−1) and apparent activation energy (31.6kJmol−1) were close to the previously reported for powdered supported Pd catalysts. Remarkably, the catalyst showed a high stability in long-term continuous application (100h on stream).

Publisher URL: www.sciencedirect.com/science

DOI: S0926337317306410

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