کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9610497 | 47207 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimal compositional and structural design of a LaMnO3/ZrO2/Pd-based catalyst for methane combustion
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The aim of this work was to identify the optimum synthesis conditions and the most effective technique for noble metal deposition in a perovskite/palladium-based catalyst for natural gas combustion. The solution combustion synthesis (SCS) of perovskite/zirconia-based materials was investigated, by starting from metal nitrates/glycine mixtures. Characterization and catalytic activity tests were performed on as-prepared powders and then repeated after calcination for 2 h at 900 °C in calm air. Calcination appeared to be beneficial in that, despite lowering the specific surface area, it promoted the simultaneous crystallization of both LaMnO3 and ZrO2 and the half-conversion temperature (T50), regarded as an index of catalytic activity, was lowered. Two phases, both active towards methane oxidation - lanthanum manganate and palladium oxide - were combined so as to evaluate their synergism in terms of catalytic activity. Pd was therefore added either via incipient wetness impregnation on LaMnO3·2ZrO2 or through a one-step SCS-based route. Characterization and catalytic activity tests followed suit. Optimal composition and preparation routes were found: T50 was lowered from 507 °C - pure LaMnO3 prepared via SCS - to 432 °C attained with a 2% (w/w) Pd load on pre-calcined LaMnO3·2ZrO2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 100, Issues 3â4, 28 February 2005, Pages 275-281
Journal: Catalysis Today - Volume 100, Issues 3â4, 28 February 2005, Pages 275-281
نویسندگان
A. Civera, G. Negro, S. Specchia, G. Saracco, V. Specchia,