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- Title
The use of boric acid (HBO) and boron oxide (BO) for co-precipitation synthesis of cobalt-boron catalysts: Catalytic activity in hydrogen generation.
- Authors
Coşkuner, B.; Kantürk Figen, A.; Pişkin, M.
- Abstract
The use of boric acid (HBO) and boron oxide (BO) 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 (CoCl · 6HO), cobalt sulfate (CoSO · 5HO) and cobalt(II) nitrate (Co(NO) · 7HO)] were used with HBO and BO 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 BO and CoCl · 6HO salt. Additionally, the effect of temperature, stabilizer ratio and NaBH/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 H g catalyst min, the activation energy is 43.55 kJ mol and the constant of Arrhenius equation is 11 min.
- Subjects
BORIC acid; BORON oxide; PRECIPITATION (Chemistry); COBALT catalysts; CATALYST synthesis; CATALYTIC activity; INTERSTITIAL hydrogen generation
- Publication
Kinetics & Catalysis, 2014, Vol 55, Issue 6, p809
- ISSN
0023-1584
- Publication type
Article
- DOI
10.1134/S002315841466001X