Ni-Supported Pd Nanoparticles with Ca Promoter: A New Catalyst for Low-Temperature Ammonia Cracking

Polański, Jarosław; Bartczak, Piotr; Ambrożkiewicz, Weronika; Sitko, Rafał; Siudyga, Tomasz; Mianowski, A.; Szade, J.; Balin, Katarzyna; Lelątko, J.

doi:10.1371/journal.pone.0136805

Cited by 24 publications

(22 citation statements)

References 26 publications

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“…67.8 kJ mol -1 (Ru catalyst). The results presented in work [16] are very interesting, but obviously there are other works, where valuable results had also been obtained [18].…”

Section: Methodsmentioning

confidence: 80%

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Szarawara–Kozik’s temperature criterion in the context of three-parameter equation for modeling ammonia or methanol decomposition during heterogenous catalysis

Mianowski

Siudyga

Polański

2018

Reac Kinet Mech Cat

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Szarawara-Kozik's temperature criterion, suggested many years ago, has been reinterpreted as three-parameter fitting equation. We demonstrated interpretation of the chemical reactions of ammonia and methanol catalytic decomposition (to produce syngas and hydrogen) by associating two parameters with the activation energy and the average enthalpy of reaction for the equilibrium conversion degrees. It was proved that the three-parameter equation can be applicable to studying a wide variety of catalytic/enzymatic processes in isothermal conditions.

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“…67.8 kJ mol -1 (Ru catalyst). The results presented in work [16] are very interesting, but obviously there are other works, where valuable results had also been obtained [18].…”

Section: Methodsmentioning

confidence: 80%

“…For studies using nanocatalysts [16] with a constant flow rate of 2 dm 3 h -1 ammonia in isothermal conditions temperature criterion 1 was used for calculation of activation energies as shown in Fig. 2.…”

Section: Methodsmentioning

confidence: 99%

Szarawara–Kozik’s temperature criterion in the context of three-parameter equation for modeling ammonia or methanol decomposition during heterogenous catalysis

Mianowski

Siudyga

Polański

2018

Reac Kinet Mech Cat

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“…In this paper, we describe X-ray diffraction and HRTEM studies of gold, silver, palladium and platinum nanoparticles. The enhanced catalytic activity of these materials was studied and their effectiveness in chemical reactions was reported (Bujak et al, 2012;Korzec et al, 2014;Kapkowski et al, 2014Kapkowski et al, , 2015Polanski et al, 2015;Rams-Baron et al, 2015). The main aim of this work is precise and detailed characterization of the atomic structure of the investigated nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Paracrystalline structure of gold, silver, palladium and platinum nanoparticles

et al. 2018

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Metallic nanoparticles are of great importance because of their unique physical, chemical, antimicrobial, diagnostic, therapeutic, biomedical, sensing, biosensing, catalytic and optical properties. Detailed knowledge of the atomic scale structure of these materials is essential for understanding their activities and for exploiting their potential. This paper reports structural studies of silicasupported silver, gold, palladium and platinum nanoparticles using X-ray diffraction and high-resolution transmission electron microscopy. Electron microscopy observation allowed the determination of nanoparticle sizes, which were estimated to be in the range of 45-470 Å , and their distribution. The obtained histograms exhibit a multimodal distribution of the investigated nanoparticle sizes. The X-ray diffraction data were analyzed using the Rietveld method in the form of Williamson-Hall plots, the PDFgui fitting procedure and model-based simulation. The Williamson-Hall plots provide evidence for the presence of strain in all investigated samples. The PDFgui fitting results indicate that the investigated nanoparticles consist of atomic clusters with different sizes and degrees of disorder as well as slightly different lattice parameters. The detailed structural characterization performed via model-based simulations proves that all samples exhibit a face-centered cubic type structure with paracrystalline distortion. The degree of disorder predicted by the paracrystalline theory is correlated with the sizes of the nanoparticles. The catalytic properties of the investigated noble metals are discussed in relation to their disordered structure. research papers J. Appl. Cryst. (2018). 51, 411-419 Karolina Jurkiewicz et al. Paracrystalline structure of metallic nanoparticles 415 research papers J. Appl. Cryst. (2018). 51, 411-419 Karolina Jurkiewicz et al. Paracrystalline structure of metallic nanoparticles 417 research papers J. Appl. Cryst. (2018). 51, 411-419 Karolina Jurkiewicz et al. Paracrystalline structure of metallic nanoparticles 419

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“…Various nickel-containing materials have been reported to be active for the catalytic decomposition of ammonia [40][41][42][43][44][45][46]. Since the ammonia decomposition reaction is an equilibrium reaction at a middle temperature range, these earlier works might suggest the possibility of the nickel-containing materials working as active catalysts for ammonia synthesis.…”

Section: Introductionmentioning

confidence: 98%

Higher Activity of Ni/γ-Al2O3 over Fe/γ-Al2O3 and Ru/γ-Al2O3 for Catalytic Ammonia Synthesis in Nonthermal Atmospheric-Pressure Plasma of N2 and H2

et al. 2020

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Developing a novel ammonia synthesis process from N2 and H2 is of interest to the catalysis and hydrogen research communities. γ-Alumina-supported nickel was determined capable of serving as an efficient catalyst for ammonia synthesis using nonthermal plasma under atmospheric pressure without heating. The catalytic activity was almost unrelated to the crystal structure and the surface area of the alumina carrier. The activity of Ni/Al2O3 was quantitatively compared with that of Fe/Al2O3 and Ru/Al2O3, which contained active metals for the conventional Haber–Bosch process. The activity sequence was Ni/Al2O3 > Al2O3 > Fe/Al2O3 > no additive > Ru/Al2O3, surprisingly indicating that the loading of Fe and Ru decreased the activity of Al2O3. The catalytic activity of Ni/Al2O3 was dependent on the amount of loaded Ni, the calcination temperature, and the reaction time. XRD, visual, and XPS observations of the catalysts before the plasma reaction indicated the generation of NiO and NiAl2O4 on Al2O3, the latter of which was generated upon high-temperature calcination. The NiO species was readily reduced to Ni metal in the plasma reaction, whereas the NiAl2O4 species was difficult to reduce. The catalytic behavior could be attributed to the production of fine Ni metal particles that served as active sites. The PN2/PH2 ratio dependence and rate constants of formation and decomposition of ammonia were finally determined for 5.0 wt% Ni/Al2O3 calcined at 773 K. The ammonia yield was 6.3% at an applied voltage of 6.0 kV, a residence time of reactant gases of 0.12 min, and PH2/PN2 = 1.

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Ni-Supported Pd Nanoparticles with Ca Promoter: A New Catalyst for Low-Temperature Ammonia Cracking

Cited by 24 publications

References 26 publications

Szarawara–Kozik’s temperature criterion in the context of three-parameter equation for modeling ammonia or methanol decomposition during heterogenous catalysis

Szarawara–Kozik’s temperature criterion in the context of three-parameter equation for modeling ammonia or methanol decomposition during heterogenous catalysis

Paracrystalline structure of gold, silver, palladium and platinum nanoparticles

Higher Activity of Ni/γ-Al2O3 over Fe/γ-Al2O3 and Ru/γ-Al2O3 for Catalytic Ammonia Synthesis in Nonthermal Atmospheric-Pressure Plasma of N2 and H2

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