کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5487244 1523492 2018 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Strong catalytic activity of iron nanoparticles on the surfaces of reduced olivine
ترجمه فارسی عنوان
فعالیت کاتالیستی قوی نانوذرات آهن بر روی سطوح الیوین کاهش یافته است
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
چکیده انگلیسی
It is demonstrated that olivine powders heated to subsolidus temperatures in reducing conditions can develop significant concentrations of  10-50  nm diameter Fe nanoparticles on grain surfaces and that these display strong catalytic activity not observed in powders without Fe nanoparticles. Reduced surfaces were exposed to NH3, CO, and H2, volatiles that may be present on the surfaces of comet and volatile-rich asteroids. In the case of NH3 exposure, rapid decomposition was observed. When exposed to a mixture of CO and H2, significant coking of the mineral surfaces occurred. Analysis of the mineral grains after reaction indicated primarily the presence of graphene or graphitic carbon. The results demonstrate that strong chemical activity can be expected at powders that contain nanophase Fe particles. This suggests space-weathered mineral surfaces may play an important role in the synthesis and processing of organic species. This processing may be part of the weathering processes of volatile-rich but atmosphereless solar-system bodies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 299, 1 January 2018, Pages 502-512
نویسندگان
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