Enhanced hydrogen reaction kinetics of nanostructured Mg-based composites with nanoparticle metal catalysts dispersed on supports

Yoo, Yeong; Tuck, M.; Kondakindi, Rajender R.; Seo, Chan-Yeol; Dehouche, Zahir; Belkacemi, Khaled

doi:10.1016/j.jallcom.2006.12.054

Cited by 14 publications

(7 citation statements)

References 24 publications

(31 reference statements)

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“…This system shows a significant enhancement of the hydrogen sorption kinetics at 230−300 °C, in comparison with MgH 2 and MgH 2 catalyzed by BCN . Only 12 min is required for decomposition of the best Mg-based materials at 300 °C . Jensen et al have followed the kinetics of pure and nickel-doped MgH 2 by in situ time-resolved powder X-ray diffraction, and they show that the activation energy for decomposition of MgH 2 is lower for the nickel-doped samples, in agreement with previous findings. , …”

Section: Introductionsupporting

confidence: 79%

“…The effects of carbon additives on magnesium-based systems have been reported by several groups. − Others have focused on the introduction of different metals, ,− metal oxides, ,− metallic compounds, , metallic nanoparticles, ,− and carbon-supported metals to the hydride.…”

Section: Introductionmentioning

confidence: 99%

“…They also study co-doped MgH 2 by micro/nanometric nickel and nano-oxides (Al 2 O 3 and Y 2 O 3 ), showing that only Y 2 O 3 has a limited effect on the decomposition of MgH 2 containing nickel . Yoo et al studied a complex MgH 2 system cocatalyzed by Ba 3 (Ca 1+ x Nb 2- x )O 9- δ (BCN) proton-conductive ceramics and nanoparticle bimetallic Ni/Pd catalyst supported on single-wall carbon nanotubes (SWCNT). This system shows a significant enhancement of the hydrogen sorption kinetics at 230−300 °C, in comparison with MgH 2 and MgH 2 catalyzed by BCN .…”

Section: Introductionmentioning

confidence: 99%

“…Yoo et al studied a complex MgH 2 system cocatalyzed by Ba 3 (Ca 1+ x Nb 2- x )O 9- δ (BCN) proton-conductive ceramics and nanoparticle bimetallic Ni/Pd catalyst supported on single-wall carbon nanotubes (SWCNT). This system shows a significant enhancement of the hydrogen sorption kinetics at 230−300 °C, in comparison with MgH 2 and MgH 2 catalyzed by BCN . Only 12 min is required for decomposition of the best Mg-based materials at 300 °C .…”

Section: Introductionmentioning

confidence: 99%

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Effects of Carbon-Supported Nickel Catalysts on MgH₂ Decomposition

et al. 2008

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This paper analyzes the improvement of MgH2 decomposition by the addition of nickel-based catalysts, mostly carbon-supported nickel catalysts. Our study shows that some experimental parameters such as the catalyst content, its composition, the method of preparation, and milling time strongly affect its activity toward MgH2 decomposition. We observe that carbon-supported nickel catalysts have superior performance than those just containing carbon and nickel physically mixed and, especially, than those containing only nickel. This emphasizes the role played by carbon and by the nickel−carbon interaction on the activity of such MgH2-based materials. A decrease, followed by differential scanning calorimetry (DSC), in the decomposition temperature of MgH2 of 150 °C can be achieved with some selected supported catalysts. Suitable selection of the catalyst preparation conditions leads to materials for which decomposition of 6.6 wt % hydrogen occurs in just 9 min at 300 °C, in comparison to 240 min required for undoped MgH2, and is stable after five cycles. Comparison between catalysts supported on different carbon materials having similar compositions but different nickel particle size shows no relevant differences in their isothermal decomposition kinetics.

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Section: Introductionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Carbon-Supported Nickel Catalysts on MgH₂ Decomposition

et al. 2008

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“…The polyol process is an effective, simple, and inexpensive method for reduction of a large quantity of metallic powder with a uniform size and shape, and involves adjustment of the reaction time and temperature, pH, and concentration of the protective reagent (polyvinylpyrrolidone [PVP]). Moreover, it has been shown that various catalysts (e.g., PdO/Al 2 O 3 , Ag/Al 2 O 3 , PdAg/Al 2 O 3 , Ru/Al 2 O 3 , Pt/C, Pd/C, Pt/CNT, Pt-Ru/CNT, PtSn/C, PtSnNi/C, and Ni-Pd/SWNT) prepared using the polyol process have active sites at nanoscale sizes and disperse well onto the supports [1][2][3][4][5][6][7]. Thus, the polyol process has been used to prepare catalysts for a wide range of uses, including energy, combustion, pollution control, and medicine.…”

Section: Introductionmentioning

confidence: 99%