3DOM CeO2 and 3DOM ZrO2 supported nickel catalysts: synthesis, characterization and catalytic activity studies


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DEREKAYA F. , Ay I.

JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY, cilt.33, sa.4, ss.1273-1284, 2018 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 33 Konu: 4
  • Basım Tarihi: 2018
  • Doi Numarası: 10.17341/gazimmfd.416424
  • Dergi Adı: JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
  • Sayfa Sayıları: ss.1273-1284

Özet

The 3DOM ZrO2 and 3DOM CeO2 supported nickel composed catalysts were synthesizd, characterized and tested for the hydrogen production from ammonia. The 3DOM supports were synthesized by the colloidal crystal templating method by using the polystyrene (PS) as template and than nickel was incorporated in to the 3DOM structure by the gas bubbling assisted deposition precipitation method. All materials were characterized by using the following characterization techniques: N-2 phsisorption, X-Ray diffraction, scanning electron microscopy (SEM-EDX). SEM results indicates that CeO2 and ZrO2 were obtained in three dimensionally ordered macroporous structures of which pore diameters change in between 204-321 nm. SEM results also showed that NiO was successfully impregnated in to the 3 DOM pore structures. The desired crystal phases were obtained over the catalysts and supports. All supports and catalysts have mesopores besides macropores. The catalytic activity studies were performed in order to obtain hydrogen recovery from ammonia between the temperatures of 400-600 degrees C. The catalytic activity of up to 500 degrees C was low enough to be ignored. Elevation of the reaction temperature increases the conversion. At 600 degrees C temperature, 5.6% and 18.6% NH3 conversions were observed over the NiO/3DOM ZrO2 and NiO/3DOM CeO2 catalysts, respectively.