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 (دانشجوی دکترای گروه مهندسی شیمی، دانشکده مهندسی شهید نیک‌بخت، دانشگاه سیستان و بلوچستان، زاهدان، ایران)
حسین  آتشی ² (استاد گروه مهندسی شیمی، دانشکده مهندسی شهید نیک‌بخت، دانشگاه سیستان و بلوچستان، زاهدان، ایران)
فرشاد  فرشچی تبریزی 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

References:

[1] Atashi, H.; Physical Chemistry Research 5, 41-56, 2017.

[2] Wu, Y.; Xu, P.; Li, L.; Advanced Powder Technology 27, 124-129, 2016.

[3] Mahmoudian, M.; J. Applied researches in chemistry (JARC) 1, 59-88, 2016.

[4] Islam, A.;.J. Porous Materials 19, 807-817, 2012.

[5] Abdollahi, M.; Atashi, H.; Tabrizi, F.F.; Advanced Powder Technology 28, 1356-1371, 2017.

[6] Moghadam, H.; Particuology 6, 271-275, 2008.

[7] Samimi, A.; Particuology 21,74-81, 2015.

[8] Samimi, A.; Powder Technology 130, 428-435, 2003.

[9] Islam, A.; Advanced Powder Technology, 24, 1119-1125, 2013.

[10] Choi, J.; Powder Technology 181, 83-88, 2008.

[11] Liu, P.; J. Physics and Chemistry of Solids, 69, 799-804, 2008.

[12] Buelna, G.; Lin, Y.; Microporous and Mesoporous materials 42, 67-76, 2001.

[13] Buelna, G.; Industrial & engineering chemistry research 42, 442-447, 2003.

[14] Buelna, G.; Lin, Y.; Separation and purification technology 39, 167-179, 2004.

[15] Chen, J.C.; Tang, C.T.; J. hazardous materials 142, 88-96, 2007.

[16] Tonetto, G.; Ferreira, M.; Damiani, D.; J. Molecular Catalysis A: Chemical 171, 123-141, 2001.

[17] Lin, W.; Applied Catalysis B: Environmental 50, 59-66, 2004.

[18] Osman, A.I.; Applied Catalysis B: Environmental 127,307-315, 2012.

[19] Beiknejad, D.; J. Porous Materials 20, 1075-1086, 2013.

[20] Lv, Y.; Materials Letters 155,75-77, 2015.

[21] Müller, P.; Granular Matter, 18, 1-14, 2016.

[22] Zohdi-Fasaei, H.; J. Natural Gas Science and Engineering 35,1025-1031, 2016.

[23] Yaripour, F.; Fuel 139, 40-50,2015.

[24] Akarmazyan, S.S.; Applied Catalysis B: Environmental 145, 136-148, 2014.