Nanoparticulate PdZn as a Novel Catalyst for ZnO Nanowire Growth

Engels, Volker; Rachamim, Aron; Dalal, S. H.; Pfaendler, Sieglinde M.-L.; Geng, Junfeng; Berenguer-Murcia, Ángel; Flewitt, Andrew J.; Wheatley, Andrew E. H.

doi:10.1007/s11671-010-9567-4

Cited by 6 publications

(6 citation statements)

References 15 publications

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“…Examples of such supports are high-surface-area materials such as nanoscopic or mesoporous metal oxides. These supports have previously proven to allow both the dimensional modulation of particle/oxide electronic interactions and an efficient turnover profile upon deposition in microreactor environments [26,55]. We are also further developing our previous data demonstrating the high activity of PdZn 50:50 nanoparticles in the growth of zinc oxide nanowires by chemical vapor deposition [26], hinting at further developmental potential of this bimetallic system in the controlled synthesis of semiconductor devices.…”

Section: Discussionsupporting

confidence: 61%

“…We have previously reported the synthesis of a range of PdZn nanoparticles, with a variety of molar ratios, via liquidtype reduction and the preliminary monitoring of their catalytic properties in both phenylacetylene semihydrogenation [25] and the growth of ZnO nanowires [26], where a 50:50 nominal metal ratio has proven highly active. We now report an extended structural study of PdZn particulates over a full compositional range.…”

Section: Introductionmentioning

confidence: 99%

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Nanoparticulate PdZn—pathways towards the synthetic control of nanosurface properties

Engels¹,

Jefferson²,

Benaskar³

et al. 2011

Nanotechnology

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This paper reports an in-depth structural investigation of PdZn nanoparticulates prepared over an entire compositional range. By using a combination of HRTEM, ICP-OES, EDX and XPS alongside PXRD, we are able to show how a liquid-type reduction process can be exploited to target different PdZn bimetallic structures while maintaining reproducibly narrow particle size distributions and average particle diameters of approximately 3 nm. Samples have been further analyzed by quantitative phase analysis of the Rietveld refined diffraction data, providing indications as to how variations in specific surface compositions are obtained when Zn is used as the alloying metal. The influence of nanolattice strain is investigated by geometric analysis of TEM data. Results suggest, in conjunction with previously published catalytic data, how different compositions of this specific bimetallic system may be exploited in catalytic processes to control substrate/product affinity. We thus demonstrate a new and simplified approach to PdZn bimetallics, which may offer novel perspectives for applications in industrial catalysis.

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Section: Discussionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Nanoparticulate PdZn—pathways towards the synthetic control of nanosurface properties

Engels¹,

Jefferson²,

Benaskar³

et al. 2011

Nanotechnology

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“…showing the feasibility of methanol steam reforming (MSR) at millisecond contact time, high conversion and low temperature over ZnPd compared to other fuels [13;14] . Besides being studied as catalyst in methanol steam reforming, the intermetallic compound ZnPd supported on ZnO is also a hydrogenation catalyst [15][16][17][18][19][20][21][22][23][24][25][26][27] , active in the reverse-water-gas-shift reaction [28][29][30] , the partial oxidation of methanol [31][32][33] , the steam reforming of ethanol [34] , the hydroformylation of ethylene [16] , the oxidative acetoxylation [35;36] , the esterification [37] and can be used as catalyst to grow ZnO nanorods [38] . General information about intermetallic compounds in catalysis can be found in a recent review [39] .…”

Section: Introductionmentioning

confidence: 99%

The Intermetallic Compound ZnPd and Its Role in Methanol Steam Reforming

Armbrüster¹,

Behrens²,

Föttinger³

et al. 2013

Catalysis Reviews

110

139

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The rich literature about the intermetallic compound ZnPd as well as several ZnPd near-surface intermetallic phases is reviewed. ZnPd is frequently observed in different catalytic reactions triggering this review in order to collect the knowledge about the compound. The review addresses the chemical and physical properties of the compound and relates these comprehensively to the catalytic properties of ZnPd in methanol steam reformingan interesting reaction to release hydrogen for a future hydrogen-based energy infrastructure from water/methanol mixtures. The broad scope of the review covers experimental work as well as quantum chemical calculations on a variety of Pd-Zn materials, aiming at covering all relevant literature to derive a sound state-of-the-art picture of the understanding gained so far

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“…It has been reported that a catalyst–cocatalyst system offers synergistic or complementary effects to promote the controllable growth of 1D nanostructures, especially 1D carbon nanomaterials. − Using the polymer template approach to incorporate a variety of metal species, a catalyst–cocatalyst system in which ZnO is catalyst and metal oxides such as SnO, Ga 2 O 3 , CuO, Y 2 O 3 , and Fe 2 O 3 are cocatalysts can be prepared.…”

Section: Resultsmentioning

confidence: 99%

Tailoring 1D ZnO Nanostructure Using Engineered Catalyst Enabled by Poly(4-vinylpyridine)

Liu

Flores

2014

J. Phys. Chem. C

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We have demonstrated a cost-effective homopolymer, poly(4-vinylpyridine), to prepare engineered catalyst systems. Using the polymer template, the composition of a catalyst system can be adjusted by metal incorporation while the size can be controlled by the catalyst layer thickness via the number of polymer coatings. We have found that the morphology of 1D ZnO nanostructures can be rationally tailored by catalyst composition in both vapor and solution-based approaches. For the vapor-based growth, incorporating a non-Zn cocatalyst reduces the onset growth temperature and affords higher growth rate. In the solution-based growth, the stability of catalyst in alkaline medium becomes critical. The presence of cocatalyst will lead to 1D ZnO nanostructures with larger diameter and lower density. Using catalyst which is identical to 1D nanostructure composition promotes epitaxial growth. A cocatalyst can be selected to tailor interactions with the precursors of 1D nanostructures for tunable morphology. These findings offer a new basis for controllable synthesis. Furthermore, harnessing the conformal coating ability of a polymeric material, catalyst nanoparticles can be uniformly deposited on the sidewalls of trenches or using selective interaction on surfaces of as-grown 1D ZnO nanostructures for sequential growth. This offers a new way to fabricate consistent and welldefined 3D architectures.

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Nanoparticulate PdZn as a Novel Catalyst for ZnO Nanowire Growth

Cited by 6 publications

References 15 publications

Nanoparticulate PdZn—pathways towards the synthetic control of nanosurface properties

Nanoparticulate PdZn—pathways towards the synthetic control of nanosurface properties

The Intermetallic Compound ZnPd and Its Role in Methanol Steam Reforming

Tailoring 1D ZnO Nanostructure Using Engineered Catalyst Enabled by Poly(4-vinylpyridine)

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