بررسی اثر TiO2 بر خواص دفع هیدروژن از Al3Mg2

نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناسی ارشد،‌ دانشکده مهندسی متالورژی و مواد، پردیس دانشکده های فنی، دانشگاه تهران،‌ تهران، ایران.

2 2- دانشیار، دانشکده مهندسی متالورژی و مواد، پردیس دانشکده های فنی، دانشگاه تهران،‌ تهران، ایران.

3 استادیار‌، گروه مهندسی متالورژی و مواد، دانشگاه صنعتی همدان،‌ همدان، ایران.

چکیده

مطالعات نشان داده‌اند که ترکیبات پایه منیزیم می‌توانند در ذخیره سازی هیدروژن در حالت جامد استفاده شوند. در این پژوهش ترکیب بین فلزی Al3Mg2 به روش ریخته‌گری تهیه گردید. سپس نمونه‌هایی از این ترکیب تحت اتمسفر هیدروژن و در زمان‌های مختلف آسیا‌کاری شدند. نتایج حاصل از آزمایش گرماسنجی جرمی و پراش اشعه ایکس نشان داد که بیشترین میزان ذخیره سازی هیدروژن پس از 2 ساعت آسیا‌کاری در محیط این گاز بوده و کاهش وزن حدود 4/2 درصد در اثر دفع هیدروژن از نمونه مذکور حاصل شد. این میزان کاهش در طی سه مرحله در محدوده دمایی 150، 220 و360 درجه سانتی‌گراد اتفاق افتاد. در مرحله بعدی Al3Mg2 حاصل از ریخته‌گری تحت اتمسفر هیدروژن و با حضور TiO2 به عنوان کاتالیزور در زمان‌های مختلف آسیا‌کاری شد. نتایج حاصل از آزمایش گرماسنجی جرمی و پراش اشعه ایکس نشان داد که بیشترین میزان ذخیره سازی هیدروژن در این ترکیب پس از 2 ساعت در محیط هیدروژن بوده و کاهش وزن حدود 6/2 درصد وزنی در اثر دفع هیدروژن حاصل شد که نزدیک به مقدار تئوری است.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of TiO2 on Hydrogen Desorption Properties of Al3Mg2

نویسندگان [English]

  • Nima Nazeri 1
  • Shahram Raygan 2
  • Mehdi Pourabdoli 3
1 MSc, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.
2 Associate Professor, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran.
3 Assistance Professor, Department of Material Engineering, Hamedan University of Technology, Hamedan, Iran.
چکیده [English]

Studies have shown that magnesium-based compounds can be used as solid state hydrogen storage materials. In this study, the Al3Mg2 intermetallic compound was prepared by casting method. Then samples of this compound were ball milled under hydrogen atmosphere at different times. Results of thermo-gravimetry and X-ray diffraction analyses showed that the highest amount of hydrogen storage was achieved after 2 h of ball milling under hydrogen atmosphere. A weight loss of about 2.4% was achieved from mentioned sample that is the highest among the samples. This weight loss occurred during three steps at temperatures of 150, 220 and 360 °C. In the next step, Al3Mg2 ingot along with TiO2 (as catalyst) was ball milled at different times under hydrogen atmosphere. The results of thermo-gravimetry and x-ray diffraction tests showed that the highest amount of hydrogen storage in this sample was achieved after 2 hours hydrogenation and a weight loss of about 2.6% by weight was obtained due to hydrogen desorption, which is close to the theoretical value.

کلیدواژه‌ها [English]

  • "Complex metallic alloys"
  • "Al3Mg2"
  • "Magnesium hydride"
  • "Hydrogen storage"
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