摘要:
The present invention is a method for recovering a catalyst from a catalyst body comprising a carrier having a catalyst layer formed on at least a part of the surface thereof, which comprises (a) a step of forming an overcoat layer on the surface of the catalyst layer, and (b) a step of allowing the catalyst body having the overcoat layer formed thereon to stand under the condition to result in a difference in expansibility or contractility exhibited by the overcoat layer from that exhibited by the carrier, wherein exfoliation of the catalyst layer from the carrier is permitted by means of the resulting difference in expansibility or contractility under the condition.
摘要:
A hydrogen generating part is provided for reacting water and a raw material composed of carbon and hydrogen atoms to generate hydrogen gas, a raw material supply part is provided for supplying a raw material to the hydrogen generating part, a water supply part is provided for supplying water to the hydrogen generating part, a catalyst combustion part is provided, an air supply part is provided for supplying air to the catalyst combustion part, a path switching part is provided for switching raw material supply paths between the raw material supply part and the hydrogen generating part, a bypass path is provided for supplying a raw material to the catalyst combustion part from the path switching part, and a combustion gas path is provided for supplying combustion gas after the catalyst combustion part to the hydrogen generating part. The control part switches the path switching part, and the inside of the hydrogen generating part is replaced with combustion gas after the catalyst combustion part.
摘要:
When a hydrogen producing apparatus is stopped, the flow rates of a hydrocarbon-type fuel feedstock, water and an oxygen-containing oxidant gas are decreased respectively. A random decrease of the flow rates, however, invites a rapid increase in the temperature of a catalyst beyond the limit of thermal resistance, resulting in deactivation of the catalyst. Further, this poses a danger, for example, that the residual hydrocarbon-type fuel in the apparatus may be mixed with the oxidant gas after the stopping of the apparatus. Thus, in stopping the operation, the present invention exerts such control as to decrease the flow rate of the hydrocarbon-type fuel and simultaneously increase the flow rate of water while maintaining the flow rate of the oxidant gas at a constant level, stop the hydrocarbon-type fuel, and thereafter stop the water and the oxidant gas.
摘要:
The present invention relates to an electric power generator and its operation method, which electric power generator is equipped with a hydrogen generator, a polymer electrolyte fuel cell for generating electric power using hydrogen rich gas from the hydrogen generator, a burner for burning the hydrogen generator, a flow rate controller for controlling the supply amount of a burning fuel to the burner, a communicating pathway connecting the flow rate controller and the burner, a joint where at least a residual fuel gas from a fuel electrode of the fuel cell and/or an incompletely generated gas from the hydrogen generator are combined into the communicating pathway, and a pressure-transferring pipe for releasing the pressure between the joint and the flow rate controller into the flow rate controller; the electric power generator being characterized in that the flow rate controller controls the supply amount of the burning fuel on the basis of the above-mentioned pressure.
摘要:
Since carbon monoxide is generated as subcomponent in a water vapor reforming reaction, in many cases, a shifter for conducting a shift reaction on water and carbon monoxide is used in combination. Generally, in the case of a stable operation, a concentration of carbon monoxide hardly increases. However, when using conditions of a catalyst are changed due to external factors in the shifter, a concentration of carbon monoxide increases. A device includes a reformer 1 containing carbon monoxide and water vapor, and a shifter 3 having a shift catalyst body 3a, and the device supplies hydrogen gas to the shifter from a gas supply part 1. In the above device, carbon monoxide concentration detection means 6 is provided at an exit of hydrogen gas of the shifter. When a concentration of carbon monoxide that is detected by the carbon monoxide concentration detection means is larger than a set value, a quantity of water vapor is increased in the gas supply part 1.
摘要:
A hydrogen producing apparatus comprising: a reforming section having a reforming catalyst which causes a reaction between a carbon-containing organic compound as a feedstock and water; a feedstock supply section for supplying the feedstock to the reforming section; a water supply section for supplying water to the reforming section; a heating section for heating the reforming catalyst; a shifting section having a shift catalyst which causes a shift reaction between carbon monoxide and water contained in a reformed gas supplied from the reforming section; and a purifying section having a purifying catalyst which causes oxidation or methanation of carbon monoxide contained in a gas supplied from the shifting section, wherein the shift catalyst comprises a platinum group metal and a metal oxide.
摘要:
In order to provide a step capable of reliably detecting a CO concentration in a reformed gas at low cost and a hydrogen purifier capable of fully exerting a function of a CO purifying catalyst, a gas concentration detector comprising a reaction chamber which has a catalyst layer and a gas temperature detector and capable of detecting the concentration of carbon monoxide in the gas by means of a signal of the temperature detector referring to a reformed gas passing along through the reaction chamber.
摘要:
Many organic raw materials contain sulfur components, and the sulfur component is a catalyst poisoning component for their catalysts to decrease steam reforming reactivity. A hydrogen generator including a raw material supplying unit 4 supplying a raw material containing a sulfur component and composed of an organic compound, a water supplying unit 5 supplying water, a reformer 1 producing hydrogen gas, the reformer 1 provided with a reforming catalyst to make the raw material and water undergo a reaction, and a carbon monoxide removing unit 6 reducing the content of carbon monoxide in hydrogen gas produced in the reformer 1, wherein the reforming catalyst is constituted by a carrier composed of platinum and a metal oxide is provided.
摘要:
Conventional hydrogen purification apparatuses cannot be used satisfactorily for applications in which much time is required for startup of the apparatus, and the apparatus is repeatedly started and stopped at frequent intervals because of complicated handling. In a hydrogen purification apparatus comprising at least a catalysis body 1 removing carbon monoxide from a reformed gas containing hydrogen, carbon monoxide and steam, the catalyst body 1 is constituted by a carrier comprised of a complex oxide in which at least one of Mo, W and Re is compounded with Zr, or comprised of an oxide of one of Mo, W, Re and Zr, and at least one of Pt, Pd, Rh and Ru carried on the surface of the carrier.
摘要:
It was difficult to acquire a good CO cleanup efficiency in a hydrogen refining apparatus, for instance, when the start-up and stop operations are frequently repeated. A hydrogen refining apparatus, including a shifter 3 having a shifting catalyst body 3a containing noble metals and metal oxides, and a reforming section 1 for supplying hydrogen gas containing carbon monoxide to the shifter 3, (1) the temperature of an upstream side of the shifting catalyst body 3a relative to the hydrogen gas flow being substantially between 300°C and 500°C and (2) the temperature of a downstream side of the shifting catalyst body 3a relative to the hydrogen gas flow being substantially at 300°C or less.