The growth mechanism of nickel in the preparation of Ni/Al2O3 catalysts studied by LEIS, XPS and catalytic activity

Jacobs, J.‐P.; Lindfors, Lars Peter; Reintjes, John G.H.; Jylhä, O.; Brongersma, Hidde H.

doi:10.1007/bf00816311

Cited by 59 publications

(24 citation statements)

References 13 publications

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“…[162] With maximum atom utilization and high catalytic activity, single-atom catalysts are considered as promising candidates for electrocatalysis. [163][164][165][166][167] With the help of the aforementioned coordination engineering, including regulation of the center metal atom, the number of coordinated nitrogen atoms, type of the coordinated nitrogen atoms, coordination with heteroatoms, as well as construction of dual-atom sites, the electronic structure of SACs can be effectively tuned and thus the activity and selectivity can be manipulated. Specially, some strategies help to improve H 2 O 2 selectivity, such as choosing the appropriate metal center (like Co), introducing O element as the coordination atom, and synthesizing pyrrolic-N with high content.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Coordination Engineering of Single‐Atom Catalysts for the Oxygen Reduction Reaction: A Review

Zhang

Yang

Liu

2020

Advanced Energy Materials

306

185

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Future renewable energy supplies and a sustainable environment rely on many important catalytic processes. Single‐atom catalysts (SACs) are attractive because of their maximum atom utilization efficiency, tunable electronic structures, and outstanding catalytic performance. Of particular note, transition‐metal SACs exhibit excellent catalytic activity and selectivity for the oxygen reduction reaction (ORR)—an important half reaction in fuel cells and metal–air batteries as well as for portable hydrogen peroxide (H2O2) production. Although considerable efforts have been made on the synthesis of SACs for ORR, the regulation of the coordination environments of SACs and thus the electronic structures still pose a big challenge. In this review, strategies for manipulating the coordination environments of SACs are classified into three categories, including regulation of the center metal atoms, manipulation of the surrounding environment connecting to the center metal atom, and modification of the geometric configuration of the support. Finally, some issues regarding the future development of SACs for ORR are raised and possible solutions are proposed.

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Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Coordination Engineering of Single‐Atom Catalysts for the Oxygen Reduction Reaction: A Review

Zhang

Yang

Liu

2020

Advanced Energy Materials

306

185

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“…The first reports of the use of ALD for preparing supported heterogeneous catalysts are from the Soviet Union in the early 1970s, typically reported under the name "molecular layering" [12,[19][20][21][22][23][24]. In 1990s, there was a strong industry-driven effort for ALD for catalysis in Finland; the technique was then called "atomic layer epitaxy" [11,[25][26][27][28][29][30][31][32]. Interest in ALD for the preparation of supported heterogeneous catalysts has again been increasing during the past decade [33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

“…Nickel is a well known hydrogenation catalyst. Supported nickel catalysts were among the first ALD catalysts studied in Finland in the 1990s, with focus on toluene hydrogenation [28,29]. More recently, nickel catalysts have received attention for example in biomass gasification, not only because of their low price compared to noble metals, but also because they are highly active in tar cracking and reforming [46].…”

Section: Introductionmentioning

confidence: 99%

Nickel Supported on Mesoporous Zirconium Oxide by Atomic Layer Deposition: Initial Fixed-Bed Reactor Study

et al. 2019

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Atomic layer deposition (ALD) is gaining attention as a catalyst preparation method able to produce metal (oxide, sulphide, etc.) nanoparticles of uniform size down to single atoms. This work reports our initial experiments to support nickel on mesoporous zirconia. Nickel (2,2,6,6-tetramethyl-3,5-heptanedionate) 2 [Ni(thd) 2 ] was reacted in a fixed-bed ALD reactor with zirconia, characterised with BET surface area of 72 m 2 /g and mean pore size of 14 nm. According to X-ray fluorescence measurements, the average nickel loading on the top part of the support bed was on the order of 1 wt%, corresponding to circa one nickel atom per square nanometre. Cross-sectional scanning electron microscopy combined with energy-dispersive spectroscopy confirmed that in the top part of the fixed support bed, nickel was distributed throughout the zirconia particles. X-ray photoelectron spectroscopy indicated the nickel oxidation state to be two. Organic thd ligands remained complete on the surface after the Ni(thd) 2 reaction with zirconia, as followed with diffuse reflectance infrared Fourier transform spectroscopy. The ligands could be fully removed by oxidation at 400 °C. These initial results indicate that nickel catalysts on zirconia can likely be made by ALD. Before catalytic testing, in addition to increasing the nickel loading by repeated ALD cycles, optimization of the process parameters is required to ensure uniform distribution of nickel throughout the support bed and within the zirconia particles.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…Although supported nickel catalysts prepared from acetylacetonate complexes showed promising properties both in dispersion [3] and in stability during catalysis [4], only a few results have been reported for catalysts prepared from Ni acetylacetonate precursors in solution [4][5][6][7], and even less are reported for catalysts prepared by the GPI-D method [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterisation of highly dispersed Ni/SiO2 catalysts prepared by gas-phase impregnation/decomposition (GPI/D) of a Ni(II) ?-diketonate precursor complex

et al. 2005

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Silica-supported nickel catalysts have been prepared by a solventless technique involving the deposition of the [Ni(tmen)(acac) 2 ] precursor from the gas phase. According to UV-vis and IR spectroscopy and to elemental analysis, the initial deposition step results in the grafting of Ni(II) complexes on silanol groups to give predominantly [Ni(acac) 2 ( " Si-OH) 2 ] 0 monomeric inner-sphere complexes, with elimination of the neutral (tmen) ligands into the gas phase. Subsequent thermal treatments in oxidising atmospheres causes an oxidative decomposition of the (acac) ligands without nickel desorption or coalescence into oxide crystallites. The ensuing coordinatively unsaturated Ni(II) centres are reduced to Ni(0) by flowing hydrogen at low temperatures (300°C), yielding nanosized Ni particles as evidenced by TEM and O 2 titration. Thus, the gas-phase deposition technique represents an interesting alternative to conventional ''wet'' deposition procedures since it allows one to obtain well-dispersed supported nickel catalysts by reduction at low-temperatures.

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The growth mechanism of nickel in the preparation of Ni/Al2O3 catalysts studied by LEIS, XPS and catalytic activity

Cited by 59 publications

References 13 publications

Coordination Engineering of Single‐Atom Catalysts for the Oxygen Reduction Reaction: A Review

Coordination Engineering of Single‐Atom Catalysts for the Oxygen Reduction Reaction: A Review

Nickel Supported on Mesoporous Zirconium Oxide by Atomic Layer Deposition: Initial Fixed-Bed Reactor Study

Synthesis and characterisation of highly dispersed Ni/SiO2 catalysts prepared by gas-phase impregnation/decomposition (GPI/D) of a Ni(II) ?-diketonate precursor complex

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