مقایسه اثر کاتیون‌های لانتانیم، استرانسیوم و باریم بر عملکرد غشای پروسکایتی گروه (A-Sr-Co-Fe-(A:La, Ba, Sr در عبور اکسیژن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 پژوهشگاه صنعت نفت، پژوهشکده شیمی و پتروشیمی

2 پژوهشگاه صنعت نفت، پژوهشکده گاز

3 دانشگاه صنعتی شریف،دانشکده شیمی

چکیده

غشاهای چگال پروسـکایتی (La0.6Sr0.4Co0.8Fe0.2O3-δ (LSCF،
(اBa0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF و (SCF)ا SrCo0.8Fe0.2O3-δ با استفاده از روش تشکیل کمپلکس EDTA با سیترات سنتز شدند. ساختار فازی نمونه‌های پروسکایتی با استفاده از آنالیز پراش اشعه ایکس (XRD) مشخص شده و نتایج جذب اتمی و پلاسمای القایی، تأیید کننده فرمول تئوری پروسکایت‌های تشکیل شده است. با تغییر پارامترهای موثری مثل ضخامت غشا، فشار جزئی اکسیژن در خوراک، دما و نوع مواد به‌کار رفته در ساختار پروسکایت‌ها، شار عبوری اکسیژن اندازه‌گیری و بهینه‌سازی شد. شار اکسیژن در محدوده دمایی بین 1073 تا 1223 کلوین و فشار جزئی اکسیژن بین 1 /0 تا 1 بار در جریان خوراک شامل اکسیژن و نیتروژن اندازه‌گیری شد. در محدوده دمایی بررسی شده، میزان عبور دهی اکسیژن در سه پروسکایت به صورت BSCF>SCF>LSCF بود که محاسبات مربوط به پارامترهای کریستالوگرافی مثل انرژی شبکه و حجم آزاد نیز این نکته را تأئید می‌نماید. تغییرات خطی شار نفوذ اکسیژن با نسبت لگاریتم نپرین فشارهای جزئی اکسیژن در دو سمت غشا ((ln(P2/P1) نشان دهنده آن است که نفوذ توده‌ای، مرحله کنترل کننده سرعت شار نفوذ می باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of the Effect Cations La, Sr, and Ba on Oxygen Permeation Through A-Sr-Co-Fe (A: La, Ba, and Sr) Perovskite Membranes

نویسندگان [English]

  • Zahra Taheri 1
  • Ensieh Ganji Babakhani 2
  • Laleh Shirazi 2
  • Khodadad Nazari 1
  • Bahram Ghanbari 3
1 Chemical and Petrochemical Department, Research Institute of Petroleum Industry (RIPI)
2 Gas Department, Research Institute of Petroleum Industry (RIPI)
3 Faculty of Chemistry, Sharif University of Technology
چکیده [English]

Perovskite dense membranes of La0.6Sr0.4Co0.8Fe0.2O3−δ (LSCF), Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and SrCo0.8Fe0.2O3-δ(SCF) were prepared by complexation method with EDTA-citrate. The perovskite phase structure of the samples was characterized by X-ray diffraction and experimental formula and stoichiometry of the metal ions for the prepared perovskite were confirmed by atomic absorption spectroscopy and inductively coupled plasma. The oxygen permeation flux through the perovskite dense membranes was measured and optimized by change in oxygen partial pressure, temperature, membrane thickness, and the used composition in perovskite structure. The oxygen permeation flux was measured in the range of temperature within 1073–1223 K and the partial pressure of 0.1–1.0 bar. The flux increases in the order of LSCF < SCF< BSCF membranes and the calculations of crystallography parameters such as lattice energy and free volume can confirm this point. The linear changes of oxygen flux versus ln(P2/P1) states that bulk diffusion through the membrane is the rate-limiting step.

کلیدواژه‌ها [English]

  • Dense Membrane
  • Perovskite
  • Bulk Diffusion
  • Oxygen Permeation
  • Oxygen Separation from Air

مراجع

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پژوهش نفت
دوره 22، شماره 69 - شماره پیاپی 69
فروردین و اردیبهشت 1391
صفحه 86-97

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