Modification of Mesopore Extrudate Gamma Alumina through Thermal Ammonia Treatment

A particular type of mesopore extrudates gamma alumina was prepared; which is used as the catalyst in the heavy oil desulfurization unit. Extrudates gamma-alumina support has been made of the boehmite powder from Nephlinsinite mine ores (Surface Area (S.A.) >۲۰۰ m۲/g, Pore Volume (P.V.) =۰.۴۸ cm۳/g, Average Pore Diameter (A.P.D.) = ۸.۱۰ nm); then, many samples of extrudate gamma-alumina (γ-Al۲O۳) have been created to carry out a research the thermal and ammonia treatments under various operating situations (thermal effect ۲۵,۴۰,۶۰,۸۰ and ۱۰۰ºC and Consecutive treatments) so as to exhibit the effects of different operating conditions on the pore volume and diameter in the prepared γ-Al۲O۳ heavy oil catalyst support. Textural properties of catalyst support have been identified by X-Ray Diffraction (XRD), N۲-adsorption/desorption, FT-IR, radial strength, and Loss of Ignition (L.O.I) methods. The best effect of the ammonia treatment on the extrudate γ-Al۲O۳ support was observed after three ammonia treatments at ۸۰ºC; under those circumstances, the resulted catalyst support has the highest amount of resemblance along with the commercial sample (S.A.=۲۱۵.۷۵ m۲/g, P.V.=۰.۸۳ cm۳/g, A.P.D. =۱۵.۴۹nm).

Keywords:

Thermal treatment , Gamma alumina (γ-Al۲O۳) , Mesoporous alumina , Desulfurization of heavy oil