بررسی عملکرد کاتالیست دوعاملی (Pd+Pt)/HPW/UiO-66 در فرایند هیدروایزومریزاسیون نرمال هگزان

نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی دکترا، دانشکده مهندسی شیمی، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

2 استاد، دانشکده مهندسی شیمی، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران

3 کارشناس اداره برنامه ریزی تولید، شرکت پالایش نفت آبادان، آبادان، ایران

چکیده

یکی از اهداف اصلی پالایشگاه‌ها تولید بنزین مرغوب طبق استاندارهای محیط زیستی می‌باشد. بر این اساس، هیدروایزومریزاسیون نرمال هگزان و تهیه کاتالیست مناسب این فرایند از اهمیت ویژه‌ای در صنایع پالایشگاهی برخوردار است. به همین دلیل، در این پژوهش ابتدا هتروپلی اسید HPW (که اسید برونستد قوی دارد) و چارچوب‌ فلزی-آلی UiO-66 سنتز گردید. سپس با بارگذاری HPW بر UiO-66 و در نهایت با استفاده از پروموترهای پلاتین و پالادیوم، بهبود عملکرد، فعالیت و پایداری کاتالیست در فرایند هیدروایزومریزاسیون نرمال هگزان مورد بررسی قرار گرفت. در ضمن، مشخصات نمونه‌های سنتز شده به کمک آنالیز‌های XRD، FE-SEM، FT-IR،N2 adsorption/desorption وNH3-TPD  تعیین گردید. بر اساس نتایج به دست آمده، در حضور کاتالیست‌ دوعاملی (0.2%Pd+0.3%Pt)/50%HPW/UiO-66 بعد از 36 ساعت از شروع فرایند، گزینش پذیری ایزوهگزان و درصد تبدیل نرمال هگزان به ترتیب برابر با 77/4 درصد و %60  بدست آمد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation Onbifunctional Catalytic Performance of (Pd+Pt)/HPW/UiO-66 for Normal Hexane Hydroisomerization

نویسندگان [English]

  • Neda Rezaei 1
  • Majid Taghizadeh Mazandarani 2
  • masoud shakiba 3
1 PhD student, Chemical Engineering Department, Babol Noshirvani University of Technology, Babol, Iran
2 Professor, Chemical Engineering Department, Babol Noshirvani University of Technology, Babol, Iran
3 Production Planning Expert, Abadan oil refining company, Abadan, Iran
چکیده [English]

One of the main objectives of refineries is to produce high-quality gasoline while respecting environmental standards. Accordingly, the normal hexane hydroisomerization and the preparation of appropriate catalysts for this process still pose a challenge in refineries. Therefore, in this work, heteropoly phosphotungstic acid (HPW), which contains high BrØnsted acid sites, and the metal-organic framework UiO-66 were synthesized. Then, HPW/UiO-66 and (Pd+Pt)/HPW/UiO-66 samples were prepared by impregnation method to improve the stability of the catalyst. Finally, by adding platinum and palladium nanoparticles as promoters, the progress of the performance and activity of the catalyst in the normal hexane hydroisomerization was investigated. In addition, the characteristics of the synthesized samples were determined by XRD, FE-SEM, N2 adsorption/ desorption, and NH3-TPD analyses. Accordingly, in the presence of the bifunctional catalyst (0.2%Pd+0.3%Pt)/50%HPW/UiO-66, the selectivity of iso-hexane and the normal hexane conversion were obtained at 77.4 and 60%, respectively, after 36 h of reaction time.

کلیدواژه‌ها [English]

  • Hydroisomerization
  • Heteropoly Phosphotungstic Acid HPW
  • Metal-organic Framework UiO-66
  • Promoter

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