کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
61785 47605 2010 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Promoting effect of transition metal-doped Co–B alloy catalysts for hydrogen production by hydrolysis of alkaline NaBH4 solution
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Promoting effect of transition metal-doped Co–B alloy catalysts for hydrogen production by hydrolysis of alkaline NaBH4 solution
چکیده انگلیسی

A systematic and comparative study is conducted on Co–B-based ternary alloy catalysts for H2 generation by hydrolysis of NaBH4. Various transition metals, namely Ni, Fe, Cu, Cr, Mo, and W, were added to Co–B catalyst by chemical reduction of the corresponding metal salts. All the transition metals in the Co–B compounds behave in a dissimilar manner while influencing the catalytic activity. Cr, W, Mo, and Cu impose significant promoting effects on the Co–B catalyst by increasing the H2 generation rate by 3–4 times when compared to the undoped catalyst. On the contrary, Ni and Fe are only able to create a marginal increment in the catalytic performance of the Co–B catalyst. The metal/(Co + metal) molar ratio was varied in the catalyst in order to study the effect of metal doping on surface morphology, electronic interaction, and catalytic efficiency of the alloy catalyst. This systematic variation also contributed to clarify the role of each dopant metal in the electron exchange mechanism involved in NaBH4 hydrolysis. The promoting effects of the dopant metals are mainly discussed in terms of large active surface area, ability to act as Lewis acid sites for better absorption of OH− group, electronic interaction with Co active metal, and amorphous nature of the alloy catalyst.

Cr-, W-, Mo-, and Cu-doped Co–B catalyst showed 3–4 times increment in H2 generation rate when compared to the undoped catalyst for hydrolysis of NaBH4 at 298 K, while Ni and Fe are only able to create a marginal increment in the catalytic performance.Figure optionsDownload high-quality image (108 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Catalysis - Volume 271, Issue 2, 4 May 2010, Pages 315–324
نویسندگان
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