Study of the effect of digestion media on the properties of γ-alumina granules prepared via an oil-drop technique

Subject Areas :

محمد عبدالهی ¹ , حسین آتشی ² , فرشاد فرشچی تبریزی ³

1 - دانشجوی دکترای گروه مهندسی شیمی، دانشکده مهندسی شهید نیک‌بخت، دانشگاه سیستان و بلوچستان، زاهدان، ایران
2 - استاد گروه مهندسی شیمی، دانشکده مهندسی شهید نیک‌بخت، دانشگاه سیستان و بلوچستان، زاهدان، ایران
3 - دانشیار گروه مهندسی شیمی، دانشکده مهندسی شیمی، نفت و گاز، دانشگاه شیراز، شیراز، ایران

Received: 2018-03-17 Accepted : 2018-07-17 Published : 2018-08-23

Keywords: γ-Alumina, catalyst characterization, Mesoporous materials, granulation, Oil-drop route,

Abstract :

HCl is always used as precursor in synthesis of γ-alumina granules via oil-drop. A comparative study was conducted to evaluate the effect of precursor on the catalytic characteristics and performance of γ-alumina prepared via the oil-drop technique. The synthesized materials were characterized by X-ray diffraction (XRD), BET (Brunauer-Emmett-Teller), BJH (Barret-Joyner-Halenda), energy dispersive X-ray (EDX), scanning electron microscopy (SEM), transmitting electron microscopy (TEM), and ammonia temperature programmed desorption (NH3-TPD( techniques. As a general trend, the γ-alumina catalyst prepared via oil-drop using HNO3 as the precursor has the higher surface area, pore volume, pore size, and distribution which are preferred in catalysis. Based on the results, the γ-alumina samples prepared using HNO3 are superior in activity about two times at 250 °C due to the differences in crystalline size, morphology, textural properties, and acid strength. Moreover, the incorporation of chlorine into γ-alumina structure is responsible for poisoning of catalysts which is evident by the less activity for the reaction

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