Synthesis and multi-technique characterization of nickel loaded MCM-41 as potential hydrogen-storage materials

[Display omitted] •The MCM-41 allowed a Ni loading in the structure of up to ≈10 wt.% without collapsing.•The presence of different Ni species was verified by spectroscopic techniques.•The isolated Ni species coordinated to framework oxygen generate Lewis acid sites.•A low Ni loading have a positive...

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Published inMicroporous and mesoporous materials Vol. 191; pp. 103 - 111
Main Authors Carraro, P., Elías, V., García Blanco, A., Sapag, K., Moreno, S., Oliva, M., Eimer, G.
Format Journal Article
LanguageEnglish
Published San Diego, CA Elsevier Inc 01.06.2014
Elsevier
Subjects
Alternative fuels. Production and utilization
Applied sciences
Chemistry
Colloidal state and disperse state
Energy
Exact sciences and technology
Fuels
General and physical chemistry
Hydrogen
Hydrogen storage
MCM-41
Nickel
Porous materials
Hydrogen storage
Nickel
MCM-41
Characterization
Impregnation
Synthesis
Transition metal
Porous material
Modified material
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Summary:[Display omitted] •The MCM-41 allowed a Ni loading in the structure of up to ≈10 wt.% without collapsing.•The presence of different Ni species was verified by spectroscopic techniques.•The isolated Ni species coordinated to framework oxygen generate Lewis acid sites.•A low Ni loading have a positive effect on the hydrogen storage capacity of MCM-41.•The highly dispersed and acid Ni species promote the presence of H2-favorable sites. Ni/MCM-41 samples have been successfully prepared by wet impregnation method with different degrees of metal loading. Various techniques including X-ray diffraction, N2 adsorption–desorption, transmission electron microscopy, inductively coupled plasma atomic emission spectroscopy, electron microprobe analysis, UV–Vis diffuse reflectance spectra, infrared analysis, adsorption of pyridine coupled to infrared spectroscopy and hydrogen adsorption at 77K at high and low pressure conditions were employed for the materials characterization. The Ni loading degree had a marked influence on the structural, chemical, acid and hydrogen storage properties of the samples. Thus, a low Ni loading favors the presence of highly dispersed Ni species responsible of the Lewis acidity. These species would promote hydrogen-favorable sites leading to a positive effect on the hydrogen storage capacity.
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2014.03.005