گوگردزدایی اکسایشی DBT با استفاده از نانوکاتالیست‌های سه فلزی Ni-Mo-W بر پایه زئولیت‌های طبیعی مختلف: موردنیت، فرریت و کلینوپتیلولیت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، تبریز، ایران

2 دانشکده مهندسی شیمی، دانشگاه کاشان، ایران

10.22078/pr.2019.3540.2614

چکیده

در این مقاله زئولیت‌های طبیعی کلینوپتیلولیت، فرریت و موردنیت پس از اصلاح به‌روش شیمیایی به‌عنوان پایه کاتالیست‌های NiMoW مورد استفاده قرار گرفتند و در گوگردزدایی اکسایشی یک سوخت مدل مورد آزمایش قرار گرفتند. کاتالیست‌های برپایه NiMoW، با استفاده از XRDا، EDXا، FESEM و FTIR تعیین مشخصات شدند. به‌جز برای کاتالیست NiMoW-Clin، دو کاتالیست دیگر پایه‌ای بی شکل دارند که تاثیر اصلاح شیمیایی را بر تغییر ساختار بلورین زئولیت طبیعی نشان می‌دهد. NiMoW-Ferr، دارای ذراتی کوچک با پراکندگی زیاد و برهم‌کنش قوی است. نسبت کمتر Si/Al در این نمونه توسط هر دو آنالیز FTIR و EDX تایید شد. در میان نانوکاتالیست‌های مطالعه شده، g 2/0 نانوکاتالیست NiMoW-Ferr توانست 8/92%دی بنزوتیوفن را در غلظت اولیه ppm 250 در دمای C°60 در مدت min 60 حذف کند. استخراج با استونیتریل پس از ODS سه مرتبه تکرار گردید و سبب افزایش حذف دی بنزوتیوفن شد. مطالعه برروی تاثیر غلظت DBT نشان داد مقادیر زیاد غلظت DBT موجب کاهش درصد گوگردزدایی اکسایشی می‌گردد.  همچنین افزایش مقدار کاتالیست پس از یک مقدار مشخص بر بازدهی گوگردزدایی اکسایشی تاثیری ندارد.
 

کلیدواژه‌ها


عنوان مقاله [English]

Oxidative Desulfurization of DBT Using Tri-metallic Ni-Mo-W Nanocatalysts Based on Different Natural Zeolites: Mordenite, Ferrierite, and Clinoptilolite

نویسندگان [English]

  • Somaiyeh Allahyari 1
  • Nader Rahemi 1
  • Milad Mehrabi 2
  • Saeed Tadayyon 1
1 Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran
2 Chemical Engineering Faculty, Kashan University, Iran
چکیده [English]

In this paper, natural zeolites of clinoptilolite, ferrierite, and mordenite were chemically modified and used as support of NiMoW catalysts. The NiMoW based catalysts were characterized by XRD, FESEM, and FTIR. In all studied catalysts, according to XRD, NiO exists in small crystallites but XRD peaks attributed to MoO2, MoO3 or WO3 were not observed. FESEM indicted NiMoW-Ferr had small particles with high dispersion and strong interaction. Moreover, lower Si/Al ratio and higher population of metal oxides in NiMoW-Ferr nanocatalyst was confirmed by FTIR. Finally, among studied nanocatalysts, evaluation of synthesized samples in oxidative desulfurization of dibenzothiophene showed NiMoW-Ferr had supreme activity of 92.8% of dibenzothiophene removal in 250 ppm, 0.2 g of catalyst, 60 °C and 60 min reaction time.
 

کلیدواژه‌ها [English]

  • Oxidative Desulfurization
  • Ni-Mo-W
  • Nanocatalyst
  • Mordenite
  • Ferrierite
  • Clinoptilolite

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