بررسی گوگردزدایی اکسایشی کاتالیستی سوخت دیزل با کاتالیست مولیبدن بر پایه گاماآلومینا

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشگاه علوم و فنون مازندران، ایران

2 پژوهشگاه شیمی و مهندسی شیمی ایران، تهران، ایران

3 دانشکده مهندسی شیمی، دانشگاه تربیت مدرس، تهران، ایران

10.22078/pr.2019.3648.2664

چکیده

با توجه به اهمیت گوگردزدایی کامل سوخت دیزل مطابق با استانداردهای جهانی، در این پژوهش گوگردزدایی اکسایشی سوخت دیزل پالایشگاه تهران با استفاده از کاتالیست MoO3/γ-Al2O3 به‌طور کامل مورد بررسی قرار گرفته است. کاتالیست مورد نظر سنتز شده و به‌وسیله آنالیزهای XRDا، FT-IRا، BETا، SEM و EDS شناسایی شده است. اثر درصد بارگذاری فلز و متغیرهای فرآیند (دما،‌ مقدار کاتالیست، نسبت مولی اکسنده به گوگرد، زمان واکنش و نوع حلال استخراجی) روی بازده فرآیند بررسی شده است. حلال استونیتریل به‌عنوان بهترین حلال استخراج محصولات واکنش شناسایی و در این فرآیند به‌کار رفته است. بررسی پایداری کاتالیست نشان داده که علاوه‌بر تجمع ناخالصی‌های آب و سولفون روی سطح کاتالیست، حضور سایر ترکیبات هیدروکربنی موجود در سوخت دیزل بیشترین تأثیر را در غیرفعال شدن کاتالیست داشته‌اند. در شرایط بهینه به‌دست آمده در این تحقیق (دمای C° 45، نسبت اکسنده به گوگرد 12، نسبت کاتالیست به سوخت g/mL 2/0 و زمان min 90)، کاتالیست سنتز شده با 10% وزنی مولیبدن ترکیبات گوگردی سوخت دیزل تجاری را با بازده حدود 90% از ppmw 590 گوگرد به کمتر از ppmw 60 کاهش داده و از یک مرحله استخراج سولفون با حلال استونیتریل استفاده شده است.
 

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of catalytic oxidative desulfurization of diesel fuel using Mo catalyst supported on γ-Al2O3

نویسندگان [English]

  • Bita Mokhtari 1
  • Azam Akbari 2
  • Mohammadreza Omidkhah 3
1 Mazandaran University of Science and Technology, Iran
2 Chemistry and Chemical Engineering Research Center of Iran, Tehran, Iran
3 Faculty of Chemical Engineering, Tarbiat Modares University, Tehran, Iran
چکیده [English]

Considering the importance of deep desulfurization of commercial diesels in accordance with the global standards, in this study, the oxidative desulfurization of a commercial diesel of Tehran Oil Refinery using MoO3/γ-Al2O3 catalyst has been fully investigated. The synthesized catalyst has been characterized using FT-IR, SEM, EDS, BET and XRD analyses. The effect of Mo loading and main process variables (temperature, O/S molar ratio, catalyst amount, reaction time and type of extraction solvent) have been investigated. Acetonitrile has been suggested as the most effective solvent. The stability of the catalyst has been evaluated. The evaluation has shown the main effect of other hydrocarbons of the commercial diesel on the catalyst stability in addition to the effect of ODS products and water impurity adsorption on the catalyst surface. The results have indicated a very good catalytic role of MoO3/γ-Al2O3 in ODS of the diesel. Finally, at the optimal process variables, about 90% of sulfur compounds which have been present in the diesel with initial sulfur concentration of 590 ppmw have been removed using one step extraction of sulfones by acetonitrile.
 

کلیدواژه‌ها [English]

  • Catalytic oxidative desulfurization
  • Diesel Fuel
  • Solid Catalyst
  • thiophenic compounds
  • MoO3/γ-Al2O3

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