سنتز و تعیین خصوصیات نانوکاتالیست Ni-Cu/Al2O3-ZrO2 با استفاده از روش‌های تلقیح متوالی و سل- ژل جهت استفاده در تبدیل متان و دی اکسیدکربن به گاز سنتز

نوع مقاله: مقاله پژوهشی

نویسندگان

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

2 مرکز تحقیقات راکتور و کاتالیست، دانشگاه صنعتی سهند، تبریز، ایران

چکیده

در این مطالعه تأثیر روش سنتز سل-ژل در مقایسه با روش پرکاربرد تلقیح بر خواص و عملکرد کاتالیست Ni-Cu/Al2O3-ZrO2 در فرآیند ریفورمینگ خشک متان مورد ارزیابی قرار گرفت. خواص کاتالیست‌ها توسط آنالیزهای XRD ، FESEM، اPSD،ا BETا، EDSا، FTIR و TG-DTG بررسی گردیدند. نتایج آنها نشان داد روش سل-ژل در مقایسه با روش تلقیح سبب افزایش یکنواختی اندازه ذرات شده، اما به دلیل فشردگی ذرات و کاهش فضاهای متخلخل، سطح ویژه کاهش یافته است. همچنین، این روش موجب تولید فازهای بسیار نزدیک به فاز آمورف شده و خاصیت بازی کاتالیست در این روش به دلیل حضور بیشتر گروه‌های عاملی OH– افزایش یافته است. عملکرد کاتالیست‌ها به صورت تابعی از دما (550 تا C°850) و به شکل تبدیل خوراک، بازدهی محصولات و نسبت گاز سنتز تولید شده در فرآیند گزارش شده‌اند. کاتالیست تهیه شده به روش سل-ژل در همه دماها دارای نتایج مناسب‌تری نسبت به کاتالیست دیگر بوده و مناسب‌ترین نتایج در دمای C°850 به دست آمده است. نسبت گاز سنتز تولیدی در این دما 94/0 بوده که نزدیک‌ترین مقدار به نسبت استوکیومتری نسبت به سایر آزمایش‌ها در این مطالعه است.
 

کلیدواژه‌ها


عنوان مقاله [English]

Synthesis and Characterization of Ni-Cu/Al2O3-ZrO2 Nanocatalyst via Sequential Impregnation and Sol-Gel Methods Used in CH4/CO2 Conversion to Syngas

نویسندگان [English]

  • Mahdi Sharifi 1
  • Mohammad Haghighi 2
  • Ali Alizadeh Eslami 1
  • farhad Rahmani 1
  • Nader Rahemi 1
1 Chemical Engineering Faculty, Sahand University of Technology, Tabriz, Iran
2 Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, Tabriz, Iran
چکیده [English]

In this study, the effect of sol-gel method on the physicochemical properties of Ni-Cu/Al2O3-ZrO2 nanocatalyst was evaluated in comparison to sequential impregnation method. The nanocatalysts characterization was assessed by XRD, FESEM, PSD, EDS, FTIR, and TG-DTG analysis. The characterization results showed that a more uniform particle size distribution is obtained by the sol-gel method compared to the impregnation one. However, the surface area of this catalyst reduced due to the reduction of porous media and high particles density. Moreover, the sol-gel synthesis method led to the formation of very closely amorphous phases and the enhanced alkaline properties as a result of more –OH stretching vibration. Reforming of methane with CO2 was performed over Ni-Cu/Al2O3-ZrO2 at atmospheric pressure. The catalysts performance is inquired as a function of reaction temperature (550- 850 °C) and the results are reported in terms of feed conversion and syngas ratio. In the studied temperature range, it was found that the sol-gel synthesized catalyst showed a high activity. The best results were gained at 850 °C. Syngas ratio at this temperature was 0.94, which was very close to the stoichiometry ratio.
 

کلیدواژه‌ها [English]

  • Ni-Cu/Al2O3-ZrO2 Nanocatalyst
  • Impregnation
  • Sol-Gel
  • Dry Reforming
  • Synthesis Gas
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