Johnson Matthey Public Limited Company

Johnson Matthey Inc.

Johnson Matthey Fuel Cells Limited

Chandresh Nemchand Malde

Michael Ian Petch

John W Hayes

Stephen David Pollington

Brian Ronald Charles Theobald

Martin John Hayes

Dharshini Chryshantha Fongalland

Pamela Kapila

Francisco Lanzuela De Alvaro

Katharine Elizabeth Goodman

A polymer dispersion comprising one or more proton-conducting polymer materials in a liquid medium, and an electrocatalyst ink comprising one or more electrocatalyst materials and one or more proton-conducting polymer materials in a liquid medium are disclosed. The polymer dispersion and the electrocatalyst ink further comprise a protic acid. Electrocatalyst layers, gas diffusion electrodes, catalyzed membranes and membrane electrode assemblies prepared using the dispersion and/or the ink are also disclosed.

Polymer dispersion and electrocatalyst ink

A catalyst suitable for the dehydrogenation and hydrogenation of hydrocarbons comprises at least one first metal and at least one second metal bound to a support material. The at least one first metal comprises at least one transition metal, suitably a platinum group metal. The support material is provided with an overlayer such that acidic sites on the support material are substantially blocked. In a preferred embodiment the catalyst is also substantially chloride free. Method of preparing catalyst are also disclosed.

Catalyst

A substrate, such as a plate or catalyst monolith, may be coated with a metal oxide, particularly with a zeolite, by treating the substrate with a polyectrolyte to form a coating, and then depositing the coating of metal oxide from an aqueous slurry. A continuous coating, which may incorporate many layers, can easily be formed. In the examples polyacrylamide is used as polyelectrolyte.

Coatings

A substantially complete coating of a zeolite onto a material such as catalyst particles can be achieved by treating the material prior to or simultaneously with zeolite formation, with a polyelectrolye. Copper catalyst systems show good hydrogen storage while blocking access of hydrocarbons to the catalyst.

Coated materials

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Chandresh Nemchand Malde