کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1286281 1497951 2015 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Catalysts prepared from copper–nickel ferrites for the steam reforming of methanol
ترجمه فارسی عنوان
کاتالیزورهای آماده شده از فریت مس نیکل برای اصلاح بخار متانول
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• Fe3O4-supported Cu and Ni catalysts were prepared via reduction of Ni–Cu ferrites.
• Catalysts contained nano-size Cu or Ni (5–32 nm) and mesopores (5–30 nm) on Fe3O4.
• Reduced CuFe2O4 showed the max H2 production rate, while reduced NiFe2O4 the least.
• Formation of Fe–Ni alloy amplified the CO formation and poisoned the H2 production.

In this study, Fe3O4-supported Cu and Ni catalysts are prepared through reduction of Cu–Ni (Ni1−xCuxFe2O4) ferrites. The Cu–Ni ferrites, synthesized using a solid–state reaction method, are reduced at temperatures from 240 °C to 500 °C in a H2 atmosphere. All ferrites are characterized with granular morphology and a smooth particle surface before reduction. For the CuFe2O4, Ni0.5Cu0.5Fe2O4 and NiFe2O4 ferrites reduced at 240, 300, and 400 °C, respectively, nanosized Cu and/or Ni particles (5–32 nm) and mesopores (5–30 nm) are distributed and adhered on the surfaces of Fe3O4 supports. After increasing the reduction temperature of NiFe2O4 ferrite to 500 °C, the Ni particles and mesopores disappear from the Fe3O4 surfaces, which is due to the formation of a Fe–Ni alloy covering on the Fe3O4 surfaces. The CuFe2O4 ferrite after H2 reduction at 240 °C exhibits the highest H2 production rate of 149 ml STP/min g-cat at 360 °C. The existence of Ni content in the Cu–Ni ferrites enhances the reverse water gas shift reaction, and raises the CO selectivity while reducing the CO2 selectivity. Formation of a Fe–Ni alloy exaggerates the trend and poisons the H2 production rate.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 281, 1 May 2015, Pages 138–145
نویسندگان
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