تبدیل اتان به اتیلن در حضور دی اکسید کربن روی نانوکاتالیست Cr-K/TiO2-ZrO2 سنتزی به روشهای رسوبی و تلقیح

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز، ایران/ مرکز تحقیقات راکتور و کاتالیست، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز، ایران

2 مرکز تحقیقات راکتور و کاتالیست، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز، ایران/ دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز، ایران

3 دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز، ایران/ مرکز تحقیقات راکتور و کاتالیست، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز، ایران

چکیده

در این تحقیق، پایه ترکیبی TiO2-ZrO2 با ترکیب 25% وزنی زیرکونیا و 75% وزنی تیتانیا به روش هم‌رسوبی سنتز گردیده و 5% وزنی Cr2O3 و 3% وزنی K2O به‌روش تلقیح بر‌روی پایه ترکیبی نشانده شده است. نمونه‌های سنتز شده با آنالیزهای XRDا،FESEMا،EDXا،BET و FTIR تعیین خصوصیات شده‌اند. با مطالعه در نتایج آنالیزها مشاهده شد که رسوب‌دهی Cr2O3 و K2O بر روی پایه ترکیبی TiO2-ZrO2 تأثیر به‌سزایی بر خواص سطحی و ساختاری و نیز فعالیت کاتالیستی آن در فرآیند هیدروژن‌گیری اکسایشی اتان به اتیلن در حضور دی‌اکسید‌کربن به‌عنوان عامل اکسنده ملایم داشته است. نتایج حاصل از آنالیز XRD، تشکیل فازهای کریستالی TiO2 و ZrO2 را در نمونه‌های سنتز شده تأیید می‌کند. تصاویر FESEM و EDX بیانگر تولید کلوخه‌های کروی شکل یکنواخت در مقیاس نانومتری با توزیع یکنواختی از نانوذرات بر روی سطح با متوسط اندازه تقریباً nm 75 می‌باشند. آنالیز BET مؤید سطح ویژه بالا در نمونه‌های تهیه شده است.کاتالیست  Cr-K/TiO2-ZrO2 عملکرد کاتالیستی بالایی(راندمان تولید اتیلن 39% با انتخاب‌پذیری 97% در دمای 700ºC) را در این فرآیند و در حضور عامل اکسنده دی‌اکسیدکربن از خود نشان داده است که در آن Cr2O3 به‌عنوان فاز فعال با خاصیت ردوکس خود تبدیل اتان را بهبود بخشیده و K2O به‌عنوان تقویت‌کننده بازی انتخاب‌پذیری اتیلن را افزایش داده است.
 

کلیدواژه‌ها


عنوان مقاله [English]

Conversion of Ethane to Ethylene in the Presence of Carbon Dioxide over Cr-K/TiO2-ZrO2 Nanocatalyst Synthesized via Coprecipitation and Impregnation Methods

نویسندگان [English]

  • Azadeh Talati 1
  • Mohammad Haghighi 2
  • Farhad Rahmani 3
1 Chemical Engineering Faculty, Sahand University of Technology, Sahand New Town, Tabriz, Iran/Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, Sahand New Town, Tabriz, Iran
2 Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, Sahand New Town, Tabriz, Iran/Chemical Engineering Faculty, Sahand University of Technology, Sahand New Town, Tabriz, Iran
3 Chemical Engineering Faculty, Sahand University of Technology, Sahand New Town, Tabriz, Iran/Reactor and Catalysis Research Center (RCRC), Sahand University of Technology, Sahand New Town, Tabriz, Iran
چکیده [English]

In this investigation, TiO2-ZrO2 combined support with composition of 25wt% ZrO2 and 75wt% TiO2 was prepared by coprecipitation method and impregnated with 5 wt% of Cr2O3 and 3 wt% of K2O. The synthesized samples were characterized by XRD, FESEM, EDX, BET, and FTIR techniques. All characterization studies revealed that the deposition of Cr2O3 and K2O on the TiO2-ZrO2 combined support had obvious effect on the surface and structural properties and catalytic activity in the oxidative dehydrogenation of ethane to ethylene by carbon dioxide as a soft oxidant. The XRD analysis confirmed the formation of crystalline TiO2 and ZrO2 in the synthesized samples. The FESEM and EDX images represented the formation of homogeneous spherical type agglomerates within the nanometer range and uniform dispersion over the surface with an average particle size of about 75 nm. The BET results depicted high surface area of synthesized samples. Cr-K/TiO2-ZrO2 catalyst exhibited high performance towards the selective conversion of ethane to ethylene in the presence of CO2 (C2H4 yield of 39% as well as 97% ethylene selectivity at 700 °C), wherein Cr2O3 improved the conversion of ethane as a redox active phase and K2O enhanced the selectivity of ethylene, acting as a basic promoter.
 

کلیدواژه‌ها [English]

  • Cr-K/TiO2-ZrO2 Nanocatalyst
  • Dehydrogenation
  • Ethane
  • Ethylene
  • Carbon Dioxide

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