Hydrogen Trapping/Spillover in Metal Organic Frameworks

"Hydrogen Trapping through Designer Hydrogen Spillover Molecules with Reversible Temperature and Pressure-Induced Switching" (PI: A. Lueking; co-PIs Prof. Jing Li of Rutgers, Prof. Milton Cole of PSU Physics); Department of Energy (Energy Efficiency and Renewable Energy)

The overarching objective of the proposed work is to synthesize designer catalyzed nanoporous materials that have superior hydrogen uptake between 300K and 400K and moderate pressures. To this end, we will enable moderate temperature adsorption through optimization of the hydrogen spillover process utilizing metal-organic frameworks (MOFs), guided by systematic studies with tightly controlled surface chemistry, porosity, and structure. We are exploring the incorporation of active hydrogen dissociation centers directly into the MOF framework to provide atomic level dispersion while maintaining catalytic activity. Secondly, we are designing inherent temperature switches into the material to control desorption rate and surface-associated hydrogen. Thirdly, we are looking to capitalize and design for hysteretic adsorption utilizing known recoverable and reversible structural and chemical changes in MOFs to incorporate a pressure-induced switch that enables a significant systems pressure savings. Hydrogen trapping via these pressure and temperature switches will lead to a significant pressure savings relative to simple adsorption isotherms, thereby reducing overall system weight of hydrogen delivery.

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