title: Ni-Supported Pd Nanoparticles with Ca Promoter: A New Catalyst for Low-Temperature Ammonia Cracking.
abstract: 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).
authors: Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland.
authors: Jaroslaw
authors: J
authors: Polanski
authors: Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland.
authors: Piotr
authors: P
authors: Bartczak
authors: Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland.
authors: Weronika
authors: W
authors: Ambrozkiewicz
authors: Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland.
authors: Rafal
authors: R
authors: Sitko
authors: A. Chełkowski Institute of Physics, University of Silesia, Silesian Center for Education and Interdisciplinary Research, 41-500 Chorzów, Poland.
authors: Tomasz
authors: T
authors: Siudyga
authors: A. Chełkowski Institute of Physics, University of Silesia, Silesian Center for Education and Interdisciplinary Research, 41-500 Chorzów, Poland.
authors: Andrzej
authors: A
authors: Mianowski
authors: Department of Chemistry, Silesian University of Technology, 44-100 Gliwice, Poland.
authors: Jacek
authors: J
authors: Szade
authors: Department of Chemistry, Silesian University of Technology, 44-100 Gliwice, Poland.
authors: Katarzyna
authors: K
authors: Balin
authors: Institute of Materials Science, University of Silesia, 75 Pułku Piechoty 1A, 41-500 Chorzów, Poland.
authors: Józef
authors: J
authors: Lelątko
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D002384:Catalysis; D053768:Metal Nanoparticles / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013696:Temperature
chemical_list: D010165:Palladium; D012822:Silicon Dioxide; D000641:Ammonia; D009532:Nickel; D002118:Calcium