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Issue 17, 2018
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The effect of aluminum and platinum additives on hydrogen adsorption on mesoporous silicates

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Abstract

Recent theoretical predictions indicate that functional groups and additives could have a favorable impact on the hydrogen adsorption characteristics of sorbents; however, no definite evidence has been obtained to date and little is known about the impact of such modifications on the thermodynamics of hydrogen uptake and overall capacity. In this work, we investigate the effect of two types of additives on the cryoadsorption of hydrogen to mesoporous silica. First, Lewis and Brønsted acid sites were evaluated by grafting aluminum to the surface of mesoporous silica (MCF-17) and characterizing the resulting silicate materials’ surface area and the concentration of Brønsted and Lewis acid sites created. Heat of adsorption measurements found little influence of surface acidity on the enthalpy of hydrogen cryoadsorption. Secondly, platinum nanoparticles of 1.5 nm and 7.1 nm in diameter were loaded into MCF-17, and characterized by TEM. Hydrogen absorption measurements revealed that the addition of small amounts of metallic platinum nanoparticles increases by up to two-fold the amount of hydrogen adsorbed at liquid nitrogen temperature. Moreover, we found a direct correlation between the size of platinum particles and the amount of hydrogen stored, in favor of smaller particles.

Graphical abstract: The effect of aluminum and platinum additives on hydrogen adsorption on mesoporous silicates

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Supplementary files

Article information


Submitted
14 Oct 2017
Accepted
12 Apr 2018
First published
12 Apr 2018

Phys. Chem. Chem. Phys., 2018,20, 12075-12083
Article type
Paper
Author version available

The effect of aluminum and platinum additives on hydrogen adsorption on mesoporous silicates

G. Melaet, V. Stavila, L. Klebanoff and G. A. Somorjai, Phys. Chem. Chem. Phys., 2018, 20, 12075
DOI: 10.1039/C7CP07015B

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