کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9610569 47187 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrodesulfurization of model diesel using Pt/Al2O3 catalysts prepared by supercritical deposition
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Hydrodesulfurization of model diesel using Pt/Al2O3 catalysts prepared by supercritical deposition
چکیده انگلیسی
Pt/Al2O3 catalysts with Pt loadings ranging from 0.5 to 11 wt.% were synthesized by supercritical carbon dioxide (scCO2) deposition method. Transmission electron microscopy (TEM) images showed that the synthesized catalysts contained small Pt nanoparticles (1-4 nm in diameter) with a narrow size distribution, no observable agglomeration, and uniformly dispersed on the alumina support. The catalysts were found to be active for hydrodesulfurization of dibenzothiophene (DBT) dissolved in n-hexadecane (n-HD) without sulfiding the metal phase. The reaction proceeded only via the direct hydrogenolysis route in the temperature range 310-400 °C and at atmospheric pressure. The activity increased with increasing the metal loading. Increasing [H2]0/[DBT]0 by either increasing [H2]0 or decreasing [DBT]0, increased the DBT conversion. At a fixed weight hourly space velocity and feed concentration, conversion did not increase with increasing temperature beyond 330 °C. The presence of toluene inhibited the catalyst activity presumably due to competitive adsorption between DBT and toluene. Under the operating conditions, the reaction was far from equilibrium.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 99, Issues 3–4, 30 January 2005, Pages 365-373
نویسندگان
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