Munoz M, Ponce S, Zhang G, Etzold B (2016)
Publication Type: Journal article
Publication year: 2016
Book Volume: 192
Pages Range: 1-7
DOI: 10.1016/j.apcatb.2016.03.038
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$-$1, [4-CP]0 = 78 \textgreekmmol L$-$1). That effect could be related to the higher resistance of PtNi nanoalloy against chlorine poisoning compared to the monometallic Pt. In fact, PtNi NPs showed a remarkable stability and negligible deactivation even after storing the catalyst one month in the reaction mixture, whereas for the monometallic Pt fully deactivation resulted. The structure-sensitivity of HDC with PtNi nanocatalysts was finally confirmed as the catalytic performance was clearly dependent on the size. A volcano plot like behaviour was obtained, being 5.5 nm the optimum size. PtNi-5.5 led to the complete conversion of 4-CP in 15 min at a HDC rate of 3.12 L min$-$1 gPt$-$1.
APA:
Munoz, M., Ponce, S., Zhang, G., & Etzold, B. (2016). Size-controlled PtNi nanoparticles as highly efficient catalyst for hydrodechlorination reactions. Applied Catalysis B-Environmental, 192, 1-7. https://dx.doi.org/10.1016/j.apcatb.2016.03.038
MLA:
Munoz, Macarena, et al. "Size-controlled PtNi nanoparticles as highly efficient catalyst for hydrodechlorination reactions." Applied Catalysis B-Environmental 192 (2016): 1-7.
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