Combustion Synthesis of a Nickel Supported Catalyst: Effect of Metal Distribution on the Activity during Ethanol Decomposition

Cross, Allison; Kumar, Anand; Wolf, E. L.; Mukasyan, Alexander S.

doi:10.1021/ie301478n

Cited by 50 publications

(36 citation statements)

References 27 publications

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“…Solution combustion synthesis (SCS) is a viable method for mass‐producing nanocrystalline metal oxides in an energy‐ and time‐efficient manner . In comparison with conventional SCS, CSCS offers improved tunability of nanoporous structure of targeted materials .…”

Section: Resultsmentioning

confidence: 99%

“…The reduction temperature was determined according to the result of H 2 temperature‐programmed reduction (H 2 ‐TPR; Figure S7 in the Supporting Information). A typical SCS reaction between a metal nitrate and reducing agent (CH 2 NH 2 COOH) was expected to occur as shown in Equation

true M e^{υ} (N O_{3}) (s) + \frac{5}{9} υ φ N H_{2} C H_{2} C O O H (s) + \frac{5}{4} υ (φ - 1) O_{2} (g) \to M e O_{υ / 2} (s) + \frac{10}{9} υ φ C O_{2} (g) + \frac{25}{18} υ φ H_{2} O (g) + (\frac{5 φ + 9}{18}) υ N_{2} (g)

…”

Section: Methodsmentioning

confidence: 99%

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Tuning the Surface Composition of Ni/meso‐CeO₂ with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine

Qiu

Yin

Dai

et al. 2018

Chemistry A European J

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Selective decomposition of hydrous hydrazine (N H ⋅H O) over metal catalysts provides a promising means for onboard or portable hydrogen source applications. Studies on N H ⋅H O decomposition catalysts mainly focus on the effects of bulk composition and structure on their performances, instead of the surface-composition-dependent properties. Herein, the synthesis of an Ir-modified Ni/meso-CeO catalyst is reported by using a combination of colloidal solution combustion synthesis and galvanic replacement methods. A combination of structural characterization, control experiments, and DFT calculations reveals that the Ni-Ir alloy resulting from calcination treatment exerts a profound effect on the catalytic properties. The resulting Ni@Ni-Ir/meso-CeO catalyst shows excellent catalytic performance towards hydrogen generation from N H ⋅H O, which compares favorably with the Ni-Ir bimetallic catalysts reported to date.

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Section: Resultsmentioning

confidence: 99%

true M e^{υ} (N O_{3}) (s) + \frac{5}{9} υ φ N H_{2} C H_{2} C O O H (s) + \frac{5}{4} υ (φ - 1) O_{2} (g) \to M e O_{υ / 2} (s) + \frac{10}{9} υ φ C O_{2} (g) + \frac{25}{18} υ φ H_{2} O (g) + (\frac{5 φ + 9}{18}) υ N_{2} (g)

…”

Section: Methodsmentioning

confidence: 99%

Tuning the Surface Composition of Ni/meso‐CeO₂ with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine

Qiu

Yin

Dai

et al. 2018

Chemistry A European J

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“…However, regardless of fuel to oxidizer ratio, the final supported catalysts always involve only oxide phases. 7,34,40,41,48,49 In this work, we report SCS of silica supported active metal (nickel) catalysts in an argon atmosphere. The thus prepared Ni/SiO 2 supported catalyst possesses high activity during ethanol decomposition to produce hydrogen at low temperatures (200°C) and it has excellent stability toward deactivation with essentially no change of catalyst activity over 100h of operation.…”

Section: Introductionmentioning

confidence: 99%

In Situ Preparation of Highly Stable Ni-Based Supported Catalysts by Solution Combustion Synthesis

Cross¹,

Roslyakov

Manukyan³

et al. 2014

J. Phys. Chem. C

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Solution combustion synthesis (SCS) is typically used to produce nanostructured oxides and bulk metallic materials for a variety of application including catalysis. Here, we report in situ, one-step SCS of high surface area (155 m 2 /g) Ni catalysts supported on fumed silica (SiO 2 ). Time-resolved X-ray diffraction is used to investigate the dynamics of phase formation during combustion of nickel nitrate−glycine−ammonium nitrate reactive gels impregnated onto porous SiO 2 . It is shown that highly dispersed nickel nanoparticles (5 nm) formed in the reaction front are followed by their rapid oxidation by air oxygen. To prevent the undesired oxidation process, the synthesis was conducted in an inert atmosphere (argon, helium). It is demonstrated that low concentration oxygen impurity (less than 0.001 wt %) in the inert gas passivates the Ni nanoparticles through the formation of a thin amorphous oxide layer. The thus prepared Ni/SiO 2 supported catalyst possesses high activity during the ethanol decomposition toward hydrogen at low temperatures (200°C) and excellent stability toward deactivation with essentially no change of catalyst activity over 100 h of operation.

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“…cellulose paper, carbon nano-tubes or graphite sheet etc.) or on a porous support to decrease the energy density for CS, and increase the cooling rate of the products formed [11][12][13][14]. The CS reaction in a thin layer with relatively low temperature and fast cooling rate generates a unique microstructure of the products with fine particles and high surface area suitable for catalytic applications [12][13][14].…”

mentioning

confidence: 99%

Combustion synthesis of copper–nickel catalysts for hydrogen production from ethanol

Kumar

Cross

Manukyan

et al. 2015

Chemical Engineering Journal

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Cu and Ni based catalysts were synthesized using solution combustion synthesis method.The catalytic activity and hydrogen selectivity were investigated for ethanol decomposition reaction. The amount of fuel content in the combustion solution was found to greatly affect the phase and the microstructure of the synthesized catalyst. In situ x-ray absorption spectroscopy (XAS) studies were carried out to study the reduction of the catalyst containing mixed oxides of copper and nickel. The reduced catalyst was further subjected to an oxidizing environment to collect the in-situ XAS data during the oxidation of the catalyst. These investigations show that the catalyst oxidation state changes rapidly in the first few minutes of the pretreatment process and then gradually slows downs.

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Combustion Synthesis of a Nickel Supported Catalyst: Effect of Metal Distribution on the Activity during Ethanol Decomposition

Cited by 50 publications

References 27 publications

Tuning the Surface Composition of Ni/meso‐CeO₂ with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine

Tuning the Surface Composition of Ni/meso‐CeO₂ with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine

In Situ Preparation of Highly Stable Ni-Based Supported Catalysts by Solution Combustion Synthesis

Combustion synthesis of copper–nickel catalysts for hydrogen production from ethanol

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Combustion Synthesis of a Nickel Supported Catalyst: Effect of Metal Distribution on the Activity during Ethanol Decomposition

Cited by 50 publications

References 27 publications

Tuning the Surface Composition of Ni/meso‐CeO2 with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine

Tuning the Surface Composition of Ni/meso‐CeO2 with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine

In Situ Preparation of Highly Stable Ni-Based Supported Catalysts by Solution Combustion Synthesis

Combustion synthesis of copper–nickel catalysts for hydrogen production from ethanol

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Tuning the Surface Composition of Ni/meso‐CeO₂ with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine

Tuning the Surface Composition of Ni/meso‐CeO₂ with Iridium as an Efficient Catalyst for Hydrogen Generation from Hydrous Hydrazine