Size-controlled PtNi nanoparticles as highly efficient catalyst for hydrodechlorination reactions
Entity
UAM. Departamento de Química Física AplicadaPublisher
ElsevierDate
2016-09-05Citation
10.1016/j.apcatb.2016.03.038
Applied Catalysis B: Environmental 192 (2016): 1-7
ISSN
0926-3373 (print)DOI
10.1016/j.apcatb.2016.03.038Funded by
The authors gratefully acknowledge the funding of the German Research Council (DFG), which, within the framework of its Excellence Initiative, supports the Cluster of Excellence “Engineering of Advanced Materials” (www.eam.uni-erlangen.de) at the University of Erlangen-NürnbergEditor's Version
http://dx.doi.org/10.1016/j.apcatb.2016.03.038Subjects
4-Chlorophenol; Hydrodechlorination; Magnetic catalyst; Particle size; PtNi nanoparticles; PVP; QuímicaRights
© 2016 Elsevier B.V.Abstract
The application of size-controlled PtNi nanoparticles (NPs) as catalyst on the aqueous-phase hydrodechlorination (HDC) of 4-chlorophenol (4-CP) under ambient conditions (25 °C, 1 atm) has been investigated. NPs were synthesized as a co-reduction of both metals following a solvothermal method which allowed a proper control of the PtNi alloyed NP size in the range of 4.4-12.0 nm. To make the active sites of the nanoalloy accessible, the stabilizer poly(N-vinyl-2-pyrrolidone) was removed by washing of the NPs with H2O2/H2SO4. Evaluating the NP structure/composition influence on the activity, a clear synergic effect between Pt and Ni was found. In this sense, complete conversion of 4-CP was achieved in 1 h reaction time with the bimetallic NPs whereas only 70% was reached with the monometallic Pt counterpart (NP size = 12 nm, [Pt] = 80 mg L-1, [4-CP]0 = 78 μmol L-1). That effect could be related to the higher resistance of PtNi nanoalloy against chlorine poisoning compared to the monometallic Pt. In fact, PtNi NPs showed a remarkable stability and negligible deactivation even after storing the catalyst one month in the reaction mixture, whereas for the monometallic Pt fully deactivation resulted. The structure-sensitivity of HDC with PtNi nanocatalysts was finally confirmed as the catalytic performance was clearly dependent on the size. A volcano plot like behaviour was obtained, being 5.5 nm the optimum size. PtNi-5.5 led to the complete conversion of 4-CP in 15 min at a HDC rate of 3.12 L min-1 gPt -1
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Google Scholar:Ponce, S.
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Zhang, G.-R.
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Etzold, B.J.M.
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Muñoz, M.
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