Cobalt–nickel–phosphorus supported on Pd-activated TiO2 (Co–Ni–P/Pd-TiO2) as cost-effective and reusable catalyst for hydrogen generation from hydrolysis of alkaline sodium borohydride solution

Rakap, Murat; Kalu, Egwu E.; Özkâr, Saim

doi:10.1016/j.jallcom.2011.04.023

Cited by 96 publications

(27 citation statements)

References 59 publications

(79 reference statements)

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“…Once the catalyst configuration that evolved the most hydrogen was determined, hydrogen evolution experiments were conducted at different hydrolysis temperatures ranging from 25 to 50 °C and at three different levels of NaBH 4 concentrations (0.05, 0.10 and 0.15 M) in order to calculate kinetic parameters. Rakap et al [27] have demonstrated that a Co-Ni-P catalyst prepared through a similar method as our present work and used in sodium borohydride hydrolysis has multiple reusability. It is our premise that the present catalyst would show the same capability and maintain its activity for multiple usage.…”

Section: Testing Catalytic Activitysupporting

confidence: 57%

Electroless Nickel-Based Catalyst for Diffusion Limited Hydrogen Generation through Hydrolysis of Borohydride

Anderson

Kalu

2013

Crystals

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Catalysts based on electroless nickel and bi-metallic nickel-molybdenum nanoparticles were synthesized for the hydrolysis of sodium borohydride for hydrogen generation. The catalysts were synthesized by polymer-stabilized Pd nanoparticle-catalyzation and activation of Al 2 O 3 substrate and electroless Ni or Ni-Mo plating of the substrate for selected time lengths. Catalytic activity of the synthesized catalysts was tested for the hydrolyzation of alkaline-stabilized NaBH 4 solution for hydrogen generation. The effects of electroless plating time lengths, temperature and NaBH 4 concentration on hydrogen generation rates were analyzed and discussed. Compositional analysis and surface morphology were carried out for nano-metallized Al 2 O 3 using Scanning Electron Micrographs (SEM) and Energy Dispersive X-Ray Microanalysis (EDAX). The as-plated polymer-stabilized electroless nickel catalyst plated for 10 min and unstirred in the hydrolysis reaction exhibited appreciable catalytic activity for hydrolysis of NaBH 4 . For a zero-order reaction assumption, activation energy of hydrogen generation using the catalyst was estimated at 104.6 kJ/mol. Suggestions are provided for further work needed prior to using the catalyst for portable hydrogen generation from aqueous alkaline-stabilized NaBH 4 solution for fuel cells.

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Section: Testing Catalytic Activitysupporting

confidence: 57%

Electroless Nickel-Based Catalyst for Diffusion Limited Hydrogen Generation through Hydrolysis of Borohydride

Anderson

Kalu

2013

Crystals

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“…Figure 2 (c1) reveals that the surface of the Co-Cr-B catalyst is not porous and uneven. This causes the activity of the Co-Cr-B catalyst to be lowered in the hydrolysis of NaBH 4 . Figure 2 (b1) demonstrates that the Co-Cr-B catalyst in the activated carbon supported Co-Cr-B catalyst is retained on the surface of the activated carbon and inside the pores.…”

Section: Determination Of Catalyst Activitymentioning

confidence: 99%

“…Since aqueous solutions of NaBH 4 are not hydrolyzed at high pH values, NaOH is used to increase the pH value of the solution. In this part of the study, the effect of 10 ml of solution of 2.5% NaBH 4 , 100 mg (loaded with Baytar et al: Investigation of High-Activity Activated Carbon-Supported ... 15% Co-Cr-B) activated carbon supported catalyst and different NaOH concentrations at 30 °C on the hydrolysis of NaBH 4 was investigated.…”

Section: Effect Of Naohmentioning

confidence: 99%

“…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%

“…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. [4][5] The hydrolysis of NaBH 4 with water is indicated the following reaction. 6 NaBH 4(aq) + 2 H2O(l) → NaBO2 + 4 H2(g) Self-hydrolysis of NaBH4 does not occur at high pH values.…”

Section: Introductionmentioning

confidence: 99%

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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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Hydrogen Generation from Chemical Hydrides

Sankır

Semiz

Serin

et al. 2015

Advanced Catalytic Materials

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Cobalt–nickel–phosphorus supported on Pd-activated TiO2 (Co–Ni–P/Pd-TiO2) as cost-effective and reusable catalyst for hydrogen generation from hydrolysis of alkaline sodium borohydride solution

Cited by 96 publications

References 59 publications

Electroless Nickel-Based Catalyst for Diffusion Limited Hydrogen Generation through Hydrolysis of Borohydride

Electroless Nickel-Based Catalyst for Diffusion Limited Hydrogen Generation through Hydrolysis of Borohydride

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

Hydrogen Generation from Chemical Hydrides

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