کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6455307 1419169 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nitrogen transfer properties in tantalum nitride based materials
ترجمه فارسی عنوان
خواص انتقال نیتروژن بر روی مواد بر پایه نیترید تانتالیم
کلمات کلیدی
نیتروژن غنی شده، نیترید تانتالیم، واکنش انتقال نیتروژن،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


- Tantalum nitride materials with different surface area were prepared.
- Lattice nitrogen reactivity was studied using ammonia synthesis reaction.
- Ammonia synthesis proceeds via a mechanism akin to Mars - van Krevelen mechanism.
- Doping tantalum nitride with transition metals improves the reactivity.

Ta3-xMxNy (M = Re, Fe, Co; x = 0, 0.25, 0.5, 1) materials with different microstructural features (e.g. surface area) were successfully prepared using different synthesis techniques. The dependence of nitrogen transfer properties upon tantalum nitride microstructure and its chemical composition was evaluated using the ammonia synthesis with a H2/Ar feedstream (a reaction involving lattice nitrogen transfer). It was shown that nitrogen reactivity for tantalum nitride is more dominated by lattice nitrogen stability rather than microstructural properties. In the case of non-doped tantalum nitride, only a limited improvement of reactivity with enhanced surface area was observed which demonstrates the limited impact of microstructure upon reactivity. However, the nature of the transition metal dopant as well as its content was observed to play a key role in the nitrogen transfer properties of tantalum nitride and to impact strongly upon its reactivity. In fact, doping tantalum nitride with low levels of Co resulted in enhanced reactivity at lower temperature.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 286, 15 May 2017, Pages 147-154
نویسندگان
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