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Tytuł: Ni-Supported Pd Nanoparticles with Ca Promoter : A New Catalyst for Low-Temperature Ammonia Cracking
Autor: Polański, Jarosław
Bartczak, Piotr
Ambrozkiewicz, Weronika
Sitko, Rafał
Siudyga, Tomasz
Mianowski, Andrzej
Szade, Jacek
Balin, Katarzyna
Lelątko, Józef
Słowa kluczowe: Metal nanoparticle; Nickel nanoparticle; Ammonia; Ammonia cracking
Data wydania: 2015
Źródło: PLoS ONE, Vol. 10, iss. 8 (2015), art. no e0136805
Abstrakt: In this paper we report a new nanometallic, self-activating catalyst, namely, Ni-supported Pd nanoparticles (PdNPs/Ni) for low temperature ammonia cracking, which was prepared using a novel approach involving the transfer of nanoparticles from the intermediate carrier, i.e. nano-spherical SiO2, to the target carrier technical grade Ni (t-Ni) or high purity Ni (p-Ni) grains. The method that was developed allows a uniform nanoparticle size distribution (4,4±0.8 nm) to be obtained. Unexpectedly, the t-Ni-supported Pd NPs, which seemed to have a surface Ca impurity, appeared to be more active than the Ca-free (p-Ni) system. A comparison of the novel PdNPs/Ni catalyst with these reported in the literature clearly indicates the much better hydrogen productivity of the new system, which seems to be a highly efficient, flexible and durable catalyst for gas-phase heterogeneous ammonia cracking in which the TOF reaches a value of 2615 mmolH2/gPd min (10,570 molNH3/molPd(NP) h) at 600°C under a flow of 12 dm3/h (t-Ni).
DOI: 10.1371/journal.pone.0136805
ISSN: 1932-6203
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