Modification of Mesopore Extrudate Gamma Alumina through Thermal Ammonia Treatment

نویسندگان

  • Karim Zare Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN
  • Zahra Shahidian Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, I.R. IRAN
چکیده مقاله:

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.) >200 m2/g, Pore Volume (P.V.) =0.48 cm3/g, Average Pore Diameter (A.P.D.) = 8.10 nm); then, many samples of extrudate gamma-alumina (γ-Al2O3) have been created to carry out a research the thermal and ammonia treatments under various operating situations (thermal effect 25,40,60,80 and 100ºC and Consecutive treatments) so as to exhibit the effects of different operating conditions on the pore volume and diameter in the prepared γ-Al2O3 heavy oil catalyst support. Textural properties of catalyst support have been identified by X-Ray Diffraction (XRD), N2-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-Al2O3 support was observed after three ammonia treatments at 80ºC; under those circumstances, the resulted catalyst support has the highest amount of resemblance along with the commercial sample (S.A.=215.75 m2/g, P.V.=0.83 cm3/g, A.P.D. =15.49nm).

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Inorganic–organic hybrid materials through post-synthesis modification: Impact of the treatment with azides on the mesopore structure

Hybrid, hierarchically organized, monolithic silica gels, comprising periodically arranged mesopores and a cellular macroscopic network, have been prepared through a co-condensation reaction of tetrakis(2-hydroxyethyl)orthosilicate with chloromethyl-trimethoxysilane or 3-(chloropropyl)-triethoxysilane. Subsequent conversion of the chloro groups into azido groups, by nucleophilic substitution wi...

متن کامل

Thermal stabilization of alumina modified by lanthanum

Transition alumina, with different La loadings, were synthesized from boehmite (AlOOH) hydrosols containing a PEO/PPO/PEO triblock copolymer (Pluronics P123) and lanthanum nitrate. After calcination at 500 °C, the xerogels prepared from these sols have large specific surface area ( 400 m/g) and very large porous volumes, increasing with the amount of La to reach 2.5 cm/g for La/(La + Al) = 0.03...

متن کامل

Nanostructured Gamma Alumina from Amorphous Precursors

Introduction Nanocrystalline gamma-phase (γ) alumina is among many polytypes of alumina that find extensive applications as a catalyst and catalytic supports. The most useful properties these aluminas provide as catalyst supports are high surface area and welldefined porosity. These properties result primarily from the nano-scale crystalline character of the alumina. The problem is that both th...

متن کامل

Extrudate versus Powder Silica Alumina as Support for Re2O7 Catalyst in the Metathesis of Seed Oil-Derivatives – A Comparison

Self- and cross-metathesis of fatty acid methyl esters (FAMEs) was investigated using a silica alumina supported Re(2)O(7) catalyst. Although a 3 wt% Re(2)O(7)/SiO(2)-Al(2)O(3)/SnBu(4) is already active for the metathesis of unsaturated FAMEs, the results have shown that particle size of silica alumina support has a profound influence on its activity and selectivity. Consequently, high substrat...

متن کامل

Nursing perspective of gamma knife of treatment

Gamma knife is a new noninvasive method for treatment of patient with brain tumors. ‎Another name of this procedure is steriotatic radiosurgery.‎‏ ‏This computerized advanced ‎technique was implicated by a team including neurosurgeon, neuroradialogist, oncologist, and ‎a nurse. This method is used for treatment of certain brain tumors and lesions. The benefits are ‎l...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ذخیره در منابع من قبلا به منابع من ذحیره شده

{@ msg_add @}


عنوان ژورنال

دوره 39  شماره 3

صفحات  61- 69

تاریخ انتشار 2020-06-01

با دنبال کردن یک ژورنال هنگامی که شماره جدید این ژورنال منتشر می شود به شما از طریق ایمیل اطلاع داده می شود.

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023