Abstract:
A reactor comprising a packed bed of supported catalyst or supported catalyst precursor wherein the supported cata-lyst or the supported catalyst precursor comprise an external surface comprising a catalytically active metal or a precursor compound thereof, and the packed bed has a void content of more than 50% v and a specific surface area of more than 10 cm2/cm3, which is calculated as the total external surface area of the particles relative to the bed volume; the use of the said reactor in a chemical conversion process; a process for preparing hydrocarbons from syngas, which process comprises contacting a mixture of carbon monoxide and hydrogen in the said reactor, on the understanding that the catalytically active metal is a Group VIII metal which is at least in part present in metallic form; a packed bed of catalyst particles or catalyst precursor particles; and a catalyst particle or catalyst precursor particle.
Abstract:
A fuel reforming apparatus for a polymer electrolyte membrane fuel cell, characterized in that each of a reformer, a carbon monoxide converter, a carbon monoxide selective oxidizing reactor, a cooling device for cooling the inlet port of the carbon monoxide converter, and a cooling device for cooling the inlet gas of the carbon monoxide selective oxidizing reactor is formed cylindrical, the reformer is arranged in the center, the carbon monoxide converter is arranged on the outer circumferential portion of the reformer, and the carbon monoxide selective oxidizing reactor is arranged on the outer circumferential portion of the carbon monoxide converter so as to make reformer, transformer and reactor integral.
Abstract:
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.
Abstract:
Disclosed is a chemical microreactor that provides a means to generate hydrogen fuel from liquid sources such as ammonia, methanol, and butane through steam reforming processes when mixed with an appropriate amount of water. The microreactor contains capillary microchannels with integrated resistive heaters to facilitate the occurrence of catalytic steam reforming reactions. Two distinct embodiment styles are discussed. One embodiment style employs a packed catalyst capillary microchannel and at least one porous membrane. Another embodiment style employs a porous membrane with a large surface area or a porous membrane support structure containing a plurality of porous membranes having a large surface area in the aggregate, i.e., greater than about 1 m2/cm3. Various methods to form packed catalyst capillary microchannels, porous membranes and porous membrane support structures are also disclosed.
Abstract:
A device for selective oxidation of a substance stream comprises a selectively active catalyst. For improving the cold-starting characteristics, the device also has an oxidation catalyst that possesses high activity at low temperatures. The selectively active catalyst is applied as a coating onto one or more surfaces of interior walls of the device. A layer of oxidation catalyst is provided in at least the inlet region where the substance stream enters the device, between the layer of selectively active catalyst and the interior walls of the device.
Abstract:
The present invention is a chemical reactor and method for catalytic chemical reactions having gas phase reactants. The chemical reactor has reactor microchannels for flow of at least one reactant and at least one product, and a catalyst material wherein the at least one reactant contacts the catalyst material and reacts to form the at least one product. The improvement, according to the present invention is: the catalyst material is on a porous material having a porosity that resists bulk flow therethrough and permits molecular diffusion therein. The porous material further has a length, a width and a thickness, the porous material defining at least a portion of one wall of a bulk flow path through which the at least one reactant passes.
Abstract:
Contact, mixing, and often quenching box (8), with main dimension (D) and height (H7), comprising at least one duct section (B1) located on the upper part of said box (8) for entry of fluids in which said box (8) comprises, downstream from said duct section (B1), in the direction in which the fluids circulate, a means (B4) that provides, in said box (8), for making the fluids swirl in an approximately nonradial direction, and not parallel to the overall direction of circulation of said fluids, and comprising at least one annular, peripheral duct section (B6) for the exit of said mixture of fluids formed in said box (8) whose lower level is located above the upper level for fluid entry through at least one lateral inlet (B3) located in said box (8) above means (B4). Reaction cell (4), of an elongated shape along an approximately vertical axis comprising said contact, mixing, and quenching box (8) and use of this cell for performing exothermic reactions.
Abstract:
A shift converter (16) in a fuel processing subsystem (14, 16, 18) for a fuel cell (12) uses an improved catalyst composition (50) to reduce the amount of carbon monoxide in a process gas for the fuel cell (12). The catalyst composition (50) is a noble metal catalyst having a promoted support of mixed metal oxide, including at least both ceria and zirconia. Cerium is present in the range of 30 to 50 mole %, and zirconium is present in the range of 70 to 50 mole %. Additional metal oxides may also be present. Use of the catalyst composition (50) obviates the requirement for prior reducing of catalysts, and minimizes the need to protect the catalyst from oxygen during operation and/or shutdown.
Abstract:
An elongate reaction vessel includes at least two stages in the vertical direction in which an endothermic or exothermic catalytic reaction is carried out and comprises: A catalytic reaction zone (12a, 12b) per stage (6, 7); Introducing (2) a reaction fluid to a stage adapted for transverse motion of the fluid across the whole vertical extent of the reaction zone; introducing and extracting the catalyst; a heat exchanger (5a) for reaction fluids located inside the vessel between two successive reaction zones; means (6) for transporting reaction fluids from one stage to another preferably connected to the exchanger of the stage under consideration and to the inlet for reaction fluids of the subsequent stage; means for recovering reaction fluids downstream of the last stage. The temperature variation in each zone and the temperature level are respectively adjusted by the thickness of each zone and by heat exchange.
Abstract:
A method for hydroprocessing hydrocarbon products, preferably Fischer-Tropsch products, and a reactor useful for performing the method, are disclosed. The reactor includes one or more first catalyst beds comprising a catalyst useful for conducting relatively severe hydroprocessing and one or more second catalyst beds comprising a catalyst useful for conducting relatively mild hydroprocessing. The second catalyst beds are located at a position in the reactor where they can receive the products from the first catalyst bed(s), at least one of each of the first and second catalyst bed(s) comprises a catalyst grading scheme sufficient to remove at least a portion of any particulates from their respective feeds, and the reactor is set up to receive hydrocarbon feeds at a position above or within the first catalyst bed(s) and above or within the second catalyst bed(s). A first hydrocarbon feed with a relatively high boiling point is introduced to the first catalyst bed(s) and is subjected to relatively severe hydroprocessing. A feed comprising 1) the products from the hydroprocessing of the first hydrocarbon feed and 2) a second hydrocarbon feed with a relatively low boiling point is introduced to the second catalyst beds and is subjected to relatively mild hydroprocessing. The catalyst grading scheme minimizes pressure drop build-up through the catalyst beds. The hydrocarbon feeds are preferably derived, in whole or in part, from Fischer-Tropsch synthesis, although they can include products from petroleum refining or other suitable sources. In one embodiment, the relatively high boiling fraction is a predominantly C20null fraction and the relatively low boiling fraction is a predominantly C5-20 fraction.