Catalytic method for obtaining hydrogen or a hydrogen-rich gas starting from bioethanol and/or ethanol
The invention relates to a catalyst which is used to obtain hydrogen or a hydrogen-rich gas that is suitable for use in fuel cells or other applications from bioethanol and/or ethanol, comprising a support, a promoter agent and an active phase which is incorporated into the support, said catalyst taking the form of a calcinated solid in which the support comprises at least one oxide with high surface mobility and is modified with the promoter agent. According to the invention, the promoter agent comprises at least one oxide of a rare earth that is selected from the lanthanide group and the active phase comprises at least one oxide of a transition metal from group VIII or IB.
1. A method for obtaining hydrogen or a hydrogen-rich gas which is a catalytic process of reforming a hydrogen carrier selected from the group consisting of bioethanol, ethanol and mixtures thereof, comprising reacting the hydrogen carrier with water in the form of steam in the presence of a catalyst at a temperature between 600° C. and 800° C. in order to obtain to mixture of gases containing hydrogen, the catalyst being a calcined solid comprising
a support comprising at least one oxide with high surface mobility consisting of zirconium oxide which is modified with 1 to 30% by weight of a promoter agent, said promoter agent being selected from among oxides of lanthanum, oxides of cerium and combinations thereof;
and from 1 to 15% by weight of an active phase selected from the group consisting of nickel, cobalt and combinations thereof, wherein the support is formed by calcining the support at a temperature of at least 700° C. prior to being modified with the promoter agent.
2. The method according to claim 1 , wherein the water in the form of steam and the hydrogen carrier are made to react at a pressure between 0 and 5 bar.
3. The method according to claim 1 , wherein the water in the form of steam and the hydrogen carrier are made to react in a hydrogen carrier/water ratio of between 1:1.25 and 1:5 v/v.
4. The method according to claim 1 , wherein the water in the form of steam and the hydrogen carrier are made to react at a temperature of between 650° C. and 750° C.
5. The method according to claim 1 , wherein the gas mixture including the hydrogen resulting from the reaction of the hydrogen carrier with the water in the form of steam is fed to a medium or high temperature fuel cell.
6. The method according to claim 1 , wherein the gas mixture including the hydrogen resulting from the reaction of the hydrogen carrier with the water in the form of steam is subjected to a purification stage in order to convert at least part of the carbon monoxide possibly present in the gas mixture into carbon dioxide to obtain a purified mixture of gases.
7. The method according to claim 6 , wherein said purified mixture of gases is fed to a fuel cell.