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The Effect of Aluminum and Platinum Additives on Hydrogen Adsorption on Mesoporous Silicates

The Effect of Aluminum and Platinum Additives on Hydrogen Adsorption on Mesoporous Silicates

Gérôme Melaet, Vitalie Stavila, Lennie Klebanoff, Gabor A Somorjai

Phys Chem Chem Phys. 2018 May 3;20(17):12075-12083.

PMID: 29675525

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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
LS72329	Platinum on silica			Price

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