Role of the Support and the Ru Precursor on the Performance of Ru/Carbon Catalysts Towards H2 Production Through NaBH4 Hydrolysis

Crisafulli, C.; Scirè, Salvatore; Zito, Roberta; Bongiorno, Corrado

doi:10.1007/s10562-012-0844-y

Cited by 45 publications

(23 citation statements)

References 48 publications

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“…11,19 Before each test, samples were reduced in situ in H 2 at 300°C for 1 hour. 11,19 Before each test, samples were reduced in situ in H 2 at 300°C for 1 hour.…”

Section: Methodsmentioning

confidence: 99%

“…At pH > 13, NaBH 4 is stable, H 2 release taking place only in the presence of suitable catalysts, such as Ru, 11,12 Co, 13,14 Pt, 15,16 Ni, 17 or Pd, 18 leading to "hydrogen on demand" systems. 11 Most used supports in NaBH 4 hydrolysis were activated carbon, 9,11,19 alumina, 20 and ion exchange resins. The use of heterogeneous catalysts allows an easy control of the H 2 generation rate just by acting on the flow of the hydride solution through the catalyst, making these systems more appropriate for hydrogen on demand applications.…”

Section: Introductionmentioning

confidence: 99%

“…21 More recently, ammonia borane (NH 3 BH 3 , coded AB) was accounted an interesting alternative to SB, exhibiting higher H 2 capacity (19.6 wt%) together with a low toxicity and a high stability in ambient conditions. 11,19 The better performance of the carbon support compared to ceria, alumina, and titania was ascribed to both higher surface area and chemical inertness of the carbon at basic pH values required by SB hydrolysis. Several catalysts have been found effective in accelerating NH 3 BH 3 hydrolysis (NH 3 BH 3 + 2H 2 O → NH 4 BO 2 + 3H 2 ), namely, noble metals, 27,28 nonnoble metals, 29,30 and B-containing nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

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Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

2017

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Summary This work investigates the effect of the addition of small amounts of Ru (0.5‐1 wt%) to carbon supported Co (10 wt%) catalysts towards both NaBH4 and NH3BH3 hydrolysis for H2 production. In the sodium borohydride hydrolysis, the activity of Ru‐Co/carbon catalysts was sensibly higher than the sum of the activities of corresponding monometallic samples, whereas for the ammonia borane hydrolysis, the positive effect of Ru‐Co systems with regard to catalytic activity was less evident. The performances of Ru‐Co bimetallic catalysts correlated with the occurrence of an interaction between Ru and Co species resulting in the formation of smaller ruthenium and cobalt oxide particles with a more homogeneous dispersion on the carbon support. It was proposed that Ru°, formed during the reduction step of the Ru‐Co catalysts, favors the H2 activation, thus enhancing the reduction degree of the cobalt precursor and the number of Co nucleation centers. A subsequent reduction of cobalt and ruthenium species also occurs in the hydride reaction medium, and therefore the state of the catalyst before the catalytic experiment determines the state of the active phase formed in situ. The different relative reactivity of the Ru and Co active species towards the two investigated reactions accounted for the different behavior towards NaBH4 and NH3BH3 hydrolysis.

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“…11,19 Before each test, samples were reduced in situ in H 2 at 300°C for 1 hour. 11,19 Before each test, samples were reduced in situ in H 2 at 300°C for 1 hour.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

2017

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“…Therefore, an aqueous solution of metal hydride stabilized can be considered as a suitable material for hydrogen storage. 3 Metal hydrides are compounds such as NaBH 4 , NaH, CaH 2 , MgH 2 , LiAlH 2 . Among these metal hydrides, NaBH 4 has some advantages such as high hydrogen storage capacity (10.8%), high stability and non-flammability at high pH, optimum control over the rate of hydrogen production with supported catalysts, acceptable hydrogen production rate even at low temperatures, ease of use and availability.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, some materials with high surface area are used as support material. 11 Activated carbon, 11 carbon, 3 Al 2 O 3 12 and PdTiO 2 4 can be used as suppport materials. Activated carbon is more advantageous than other support materials due to its porous, high surface area and functional groups in its structure.…”

Section: Introductionmentioning

confidence: 99%

Investigation of High-Activity Activated Carbon-Supported Co-Cr-B Catalyst in the Generation of Hydrogen from Hydrolysis of Sodium Borohydride

Baytar¹

2018

ACSi

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In this study, activated carbon-supported Co-Cr-B catalyst was synthesized by chemical impregnation and precipitation method for use in the catalytic hydrolysis of sodium borohydride (NaBH 4 ). The activity of Co-Cr-B / activated carbon (5-20%) obtained by using different ratios was investigated while synthesizing activated carbon-supported Co-Cr-B catalyst. The effects of some parameters such as NaOH Concentration (0-5%), NaBH 4 concentration (2.5-10%), amount of catalyst (25-100 mg) and solution ambient temperature were investigated in the catalytic hydrolysis of NaBH 4 . The hydrogen production rate of Co-Cr-B catalyst without support in hydrolysis of NaBH 4 was found as 6.5 Lg -1 min -1 catalyst while the hydrogen production rate of activated carbon supported Co-Cr-B catalyst was found as 30.2 Lg -1 min -1 catalyst . In presence of activated carbon-supported Co-Cr-B catalyst, the hdyrolysis kinetic order and activation energy of NaBH 4 were found as 0.126 and 16.27 kJ/mol, respectively. The results suggest that activated carbon-supported Co-Cr-B catalysts can be used for mobile applications of Proton exchange membrane fuel cell (PEMFCs) systems.

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CuMOF@Faujasite nanocomposite as a novel catalyst for hydrogen production

Said,

Dardir,

Gabr

et al. 2024

Applied Organom Chemis

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Energy production is one of the most crucial issues presently attracting global attention. In this work, a CuMOF@Faujasite nanocomposite was synthesized and utilized as a novel efficient catalyst for hydrogen production. The produced composite was first characterized using X‐ray diffraction (XRD), Fourier‐ transform infrared (FT‐IR), thermogravimetric analysis (TGA), and differential scanning calorimetry. Surface properties were analyzed via nitrogen adsorption–desorption isotherms. All characterization results revealed the formation of a pure and well‐defined crystalline phase, with a high specific surface area (SBET) of 286 m2/g (SBET of Faujasite is 35 m2/g). Moreover, the morphology and compositional analysis of the nanocomposite were assured through the scanning (SEM) and transmission (TEM) electron microscope and X‐ray photospectroscopy (XPS). SEM and TEM images revealed sponge‐like spheres that are related to Faujasite besides small spherical particles related to CuBDC MOF. XPS analysis revealed a low content of CuMOF in the nanocomposite. The catalytic activity of the nanocomposite was tested for the dehydrogenation of NaBH4. The impact of NaBH4 concentration, weight of the catalyst, and the reaction temperature on NaBH4 hydrolysis was investigated. A hydrogen generation rate (HGR) of 484 mLmin−1 g−1 at 30 °C was achieved using 50 mg of the catalyst and 0.05 mol/l of NaBH4 owing to the high specific area and the selective active sites for such hydrolytic reaction. The kinetic analysis of the activity data indicates the first‐order behavior at low concentrations of NaBH4. Furthermore, at concentrations ≥0.065 mol L−1, zero‐order kinetics was predominant. The time needed for completion of the hydrolysis reaction was found to be decreased (~20 min) by increasing the catalyst mass as well as NaBH4 concentration or even by elevating the reaction temperature (~4 min at 60 °C). The activation energy was estimated; it was found to be 70.5 KJ mol−1. Ultimately, our catalyst showed a reasonable rate of hydrogen production, as compared to others reported earlier.

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Role of the Support and the Ru Precursor on the Performance of Ru/Carbon Catalysts Towards H2 Production Through NaBH4 Hydrolysis

Cited by 45 publications

References 48 publications

Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

Investigation of High-Activity Activated Carbon-Supported Co-Cr-B Catalyst in the Generation of Hydrogen from Hydrolysis of Sodium Borohydride

CuMOF@Faujasite nanocomposite as a novel catalyst for hydrogen production

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Role of the Support and the Ru Precursor on the Performance of Ru/Carbon Catalysts Towards H2 Production Through NaBH4 Hydrolysis

Cited by 45 publications

References 48 publications

Carbon supported bimetallic Ru-Co catalysts for H2 production through NaBH4 and NH3 BH3 hydrolysis

Carbon supported bimetallic Ru-Co catalysts for H2 production through NaBH4 and NH3 BH3 hydrolysis

Investigation of High-Activity Activated Carbon-Supported Co-Cr-B Catalyst in the Generation of Hydrogen from Hydrolysis of Sodium Borohydride

CuMOF@Faujasite nanocomposite as a novel catalyst for hydrogen production

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Product

Resources

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Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis

Carbon supported bimetallic Ru-Co catalysts for H₂ production through NaBH₄ and NH₃ BH₃ hydrolysis