کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1627217 1516453 2006 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Remarkable improvement of hydrogen sorption kinetics in magnesium catalyzed with Nb2O5
چکیده انگلیسی

Kinetics of hydrogen absorption and desorption reactions was investigated on the MgH2 composite doped with 1 mol% Nb2O5 as a catalyst by ballmilling. The composite after dehydrogenation at 200 °C absorbed gaseous hydrogen of ∼4.5 mass% even at room temperature under lower pressure than 1 MPa within 15 s and finally its capacity reached more than 5 mass%. On the other hand, the catalyzed MgH2 after rehydrogenation desorbed ∼6 mass% hydrogen at 160 °C under purified He flow, which followed the first order reaction. From the Kissinger plot, the activation energy for hydrogen desorption was estimated to be ∼71 kJ/mol H2, indicating the product was significantly activated due to the catalytic effect of Nb2O5.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 420, Issues 1–2, 31 August 2006, Pages 46–49
نویسندگان
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