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Kinetics and Catalysis

, Volume 55, Issue 6, pp 809–823 | Cite as

The use of boric acid (H3BO3) and boron oxide (B2O3) for co-precipitation synthesis of cobalt-boron catalysts: Catalytic activity in hydrogen generation

  • B. Coşkuner
  • A. Kantürk FigenEmail author
  • M. B. Pişkin
Article
  • 338 Downloads

Abstract

The use of boric acid (H3BO3) and boron oxide (B2O3) for the synthesis of cobalt-based catalysts by the co-precipitation technique was investigated and catalytic activities in hydrogen generation were evaluated. Different cobalt salts [cobalt (II) chloride (CoCl2 · 6H2O), cobalt sulfate (CoSO4 · 5H2O) and cobalt(II) nitrate (Co(NO3)2 · 7H2O)] were used with H3BO3 and B2O3 to prepare Co based catalysts. Crystalline, surface and chemical characteristics were clarified using X-ray diffraction (XRD); low temperature adsorption of nitrogen (BET), scanning electron microscopy (SEM), and inductively coupled plasma optical emission spectroscopy (ICP-OES). Three types of powder samples were obtained according to the different boron sources and cobalt salts, and it was found that an efficient Co based catalyst was obtained by co-precipitation of B2O3 and CoCl2 · 6H2O salt. Additionally, the effect of temperature, stabilizer ratio and NaBH4/catalyst ratio on parameters, characterizing the reaction of hydrogen generation was investigated. The zero order, first order and Langmuir-Hinshelwood kinetic models were used to identify the effect of Co based catalysts on the behavior of the catalytic system in hydrogen generation. Kinetic parameters of hydrogen generation for zero-order kinetic model were calculated for the following conditions: the rate of hydrogen generation is 0.93 L H2 g−1 catalyst min−1, the activation energy is 43.55 kJ mol−1 and the constant of Arrhenius equation is 11 min−1.

Keywords

Boric Acid Hydrogen Generation Boron Oxide Order Kinetic Model Cobalt Salt 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  • B. Coşkuner
    • 1
  • A. Kantürk Figen
    • 1
    Email author
  • M. B. Pişkin
    • 2
  1. 1.Department of Chemical EngineeringYildiz Technical UniversityIstanbulTurkey
  2. 2.Department of BioengineeringYildiz Technical UniversityIstanbulTurkey

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