Metal salt catalysts for enhancing hydrogen spillover

• US 8,426,337 B2
• Filed: 02/25/2009
• Issued: 04/23/2013
• Est. Priority Date: 10/11/2005
• Status: Active Grant

• Current Assignee: Board of Regents of the University of Michigan (University of Michigan)
• Original Assignee: Board of Regents of the University of Michigan (University of Michigan)
• Inventors: Yang, Ralph T., Wang, Yuhe
• Primary Examiner(s): HENDRICKSON, STUART L
• Application Number:
  US12/392,421
• Publication Number:
  US 20130045867A1
• Time in Patent Office: 1,518 Days
• Field of Search: 502/417
• US Class Current: 502/417
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01B 3/001 characterised by the uptaking medium; Treatment thereof
• CPC Class Codes: C01B 3/0015 Organic compounds; Solutions thereof
• CPC Class Codes: C01B 3/0021 Carbon, e.g. active carbon, carbon nanotubes, fullerenes; Treatment thereof
• CPC Class Codes: C01B 3/0078 Composite solid storage mediums, i.e. coherent or loose mixtures of different solid constituents, chemically or structurally heterogeneous solid masses, coated solids or solids having a chemically modified surface region
• CPC Class Codes: Y02E 60/32 Hydrogen storage

Abstract

A composition for hydrogen storage includes a receptor, a hydrogen dissociating metal doped on the receptor, and a metal salt doped on the receptor. The hydrogen dissociating metal is configured to spill over hydrogen to the receptor, and the metal salt is configured to increase a rate of the spill over of the hydrogen to the receptor.

Claims

1. A composition for hydrogen storage, comprising:

an active carbon receptor;

a hydrogen dissociating metal doped on the active carbon receptor, the hydrogen dissociating metal configured to spill over hydrogen to the active carbon receptor, the hydrogen dissociating metal being platinum; and

a metal salt doped on the receptor, the metal salt configured to increase the rate of spill over of the hydrogen to the receptor, the metal salt being a titanium halide.

2. The composition as defined in claim 1 wherein chemical bridges are not formed between i) the hydrogen dissociating metal and the receptor, and ii) the metal salt and the hydrogen dissociating metal, the chemical bridge being selected from carbon bridges, boron bridges, phosphorus bridges, sulfur bridges, bridges formed of compounds thereof, and combinations thereof.

3. A composition for hydrogen storage, comprising:

an active carbon receptor;

a hydrogen dissociating metal doped on the active carbon receptor, the hydrogen dissociating metal configured to spill over hydrogen to the active carbon receptor, the hydrogen dissociating metal being platinum; and

a metal salt doped on the receptor, the metal salt configured to increase the rate of spill over of the hydrogen to the receptor, the metal salt being a titanium halide or an iron halide; and

a chemical bridge formed between i) the hydrogen dissociating metal and the receptor, and ii) the metal salt and the hydrogen dissociating metal, the chemical bridges being selected from carbon bridges, boron bridges, phosphorus bridges, sulfur bridges, bridges formed of compounds thereof, and combinations thereof.

4. A composition for hydrogen storage, consisting essentially of:

a receptor;

a hydrogen dissociating metal doped on the receptor, the hydrogen dissociating metal configured to spill over hydrogen to the receptor, the hydrogen dissociating metal being selected from the group consisting of platinum, palladium, ruthenium, rhodium, nickel, copper, tungsten, and iron; and

a metal salt doped on the receptor, the metal salt configured to increase the rate of spill over of the hydrogen to the receptor, the metal salt being a halide or an oxide of a metal selected from the group consisting of titanium, vanadium, zirconium, iron, manganese, chromium, cobalt, and neodymium.

5. A method for increasing rates of hydrogen adsorption and desorption, comprising:

doping an active carbon receptor with a hydrogen dissociating metal that is configured to spill over hydrogen to the active carbon receptor, the hydrogen dissociating metal being platinum;

doping the receptor with a metal salt configured to increase the rate of spill over of the hydrogen to the receptor, the metal salt being a titanium halide or an iron halide; and

forming a chemical bridge between i) the hydrogen dissociating metal and the receptor, and ii) the metal salt and the hydrogen dissociating metal, the chemical bridges being selected from carbon bridges, boron bridges, phosphorus bridges, sulfur bridges, bridges formed of compounds thereof, and combinations thereof.

6. The method as defined in claim 5 wherein forming the chemical bridge is accomplished by:

forming a mixture of the hydrogen dissociating metal and the receptor;

adding the metal salt to the mixture;

adding a precursor material to the mixture; and

heating the mixture having the hydrogen dissociating metal, the metal salt and the precursor material therein, thereby forming the chemical bridge between i) the hydrogen dissociating metal and the receptor, and ii) the metal salt and the hydrogen dissociating metal.

7. The method as defined in claim 5 wherein doping the receptor with the metal salt is accomplished via an incipient-wetness method.

8. The method as defined in claim 5 wherein the doping steps are accomplished simultaneously.

9. The method as defined in claim 5 wherein doping the receptor with the hydrogen dissociating metal is accomplished prior to doping the receptor with the metal salt.

10. The method as defined in claim 5 wherein an amount of metal salt doped on the receptor ranges from 0.1 wt % to about 10 wt %.

11. The method as defined in claim 5 wherein a rate of adsorption and a rate of desorption of hydrogen via the receptor doped with the hydrogen dissociating metal and the metal salt is enhanced by up to 500% compared to a rate of adsorption and desorption of hydrogen via a receptor doped with the hydrogen dissociating metal and without the metal salt.