بهینه‌سازی گوگردزدایی اکسیداسیونی (ODS) از مدل نفتی و نمونه‌ واقعی با استفاده از کاتالیست MoO3/g-C3N4 با روش باکس بنکن

نوع مقاله: مقاله پژوهشی

نویسندگان

مرکز تحقیقات کاتالیست، دانشکده نفت و پتروشیمی، دانشگاه رازی، کرمانشاه، ایران

10.22078/pr.2018.3351.2538

چکیده

در این پژوهش فرآیند گوگردزدایی اکسیداسیونی (ODS) از مدل نفتی ppm 1000 دی‌بنزوتیوفن (DBT) با استفاده از کاتالیست MoO3/g-C3N4 مورد مطالعه قرار گرفت. H2O2 و استونیتریل به‌ترتیب به‌عنوان اکسیدکننده و استخراج‌کننده مورد استفاده قرار گرفتند. اثر بارگذاری فلز مولیبدن برروی g-C3N4 و سپس شرایط عملیاتی مربوط به فرآیند ODS شامل دما، مقدار کاتالیست، نسبت مولی H2O2/DBT و زمان واکنش با استفاده از طراحی آزمایشات به‌روش باکس بنکن (BBD) بررسی شد و بیش‌ترین میزان حذف DBT 7/97% به‌دست آمد که در شرایط بهینه‌ دمای C° 70، مقدار کاتالیست g04/0، نسبت مولی 44.8= H2O2/DBT و مدت زمان min 55 حاصل گردید. همچنین قابلیت بازیابی کاتالیست MoO3/g-C3N4 ارزیابی گردید که پس از 4 مرحله بازیابی کاهش حدودا 6% در میزان بازدهی آن مشاهده شد. در شرایط عملیاتی بهینه‌، نمونه‌های نفتی واقعی شامل بنزین و گازوئیل تهیه شده از مرکز پخش فرآورده‌های نفتی جهت بررسی مقدار حذف گوگرد مورد آزمایش قرار گرفتند و به‌ترتیب بازدهی 34/58% و 41% به‌دست آمد. به منظور مشخصه‌سازی و شناخت دقیق‌تر ساختار کاتالیست سنتز شده، آزمون‌های مشخصه‌سازی XRDا، FTIRا، EDXا، FE-SEMا و BET برروی g-C3N4 و MoO3/g-C3N4 انجام شد.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Oxidative Desulfurisation of Model Oil and Real Sample Using MoO3/g-C3N4 Catalyst and Optimization of Operating Conditions by Box-Benken Method

نویسندگان [English]

  • Fatemeh Bibak
  • Gholamreza Moradi
Catalyst Research Center, Faculty of Petroleum and Petrochemical, Razi University, Kermanshah, Iran
چکیده [English]

In this paper, the oxidative desulfurization process has been studied using MoO3/g-C3N4 mechanically synthesized catalyst. At first, Dibenzothiophene (DBT) was selected as the target compound for synthesis of the model oil, and this model was used to optimize operating conditions. Also, H2O2 and acetonitrile were used as oxidant and extract solvents respectively. The effect of molybdenum loading on g-C3N4 and the operating conditions related to the ODS process including temperature, amount of catalyst, H2O2/DBT molar ratio, and time of reaction was investigated using the Box-Behnken (BB) method in experimental design. The maximum efficiency of DBT removal was obtained about 97.7%, at optimum conditions of 70 °C, catalyst content of 0.04 g, H2O2/DBT=8.44, and within 55 min reaction time. Also, the regeneration of the catalyst was evaluated four times, showing yield decreasing 6% for 10% MoO3/g-C3N4. Finally, at optimum conditions, performance of the catalysts in the removal of sulfur compounds of gasoline and gas oil from Oil Refining & and Distribution Company was investigated, and the obtained efficiencies of sulfur removal were 58.35% and 41% respectively. The MoO3/g-C3N4 catalyst was characterized by XRD, FTIR, EDX, FE-SEM, and BET analyses.
 

کلیدواژه‌ها [English]

  • Oxidative Desulfurization (ODS)
  • Catalyst
  • MoO3/g-C3N4
  • Dibenzothiophene (DBT)
  • Box-Behnken (BB)

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