45 results about "PROX" patented technology

An apparatus removes carbon monoxide (CO) from a hydrogen-rich gas stream in a hydrogen fuel cell system. CO fouls costly catalytic particles in the membrane electrode assemblies of proton exchange membrane (PEM) fuel cells. A vessel houses a carbon monoxide adsorbent. The vessel may be a rotating pressure swing adsorber. A water gas shift reactor is upstream of the rotating pressure swing adsorber. The water gas shift reactor may include a second adsorbent adapted to adsorb carbon monoxide at low temperatures and to desorb carbon monoxide at high temperatures. The apparatus advantageously eliminates the use of a preferential oxidation (PROX) reactor, by providing an apparatus which incorporates CO adsorption in the place of the PROX reactor. This cleans up carbon monoxide without hydrogen consumption and the concomitant, undesirable excess low grade heat generation. The present invention reduces start-up duration, and improves overall fuel processor efficiency during normal operation.

The present invention provides technology for controlling, or tuning, the catalytic activity of gold provided upon nanoporous supports such as those derived from nanoparticulate, crystalline titania. In some aspects of practice, the surface of nanoparticulate media incorporated into a catalyst system of the present invention is provided with chemical modifications of the surface that dramatically suppress the ability of the resultant catalyst system to oxidize hydrogen. Yet, the system still readily oxidizes CO. In other words, by selecting and/or altering the nanoparticulate surface via the principles of the present invention, PROX catalysts are readily made from materials including catalytically active gold and nanoparticulate media. Additionally, the nanoparticulate support also may be optionally thermally treated to further enhance selectivity for CO oxidation with respect to hydrogen. Such thermal treatments may occur before or after chemical modification, but desirably occur prior to depositing catalytically active gold onto the support incorporating the nanoparticles.

A fuel cell system is provided including a fuel cell stack having a fuel cell having an anode, an anode outlet, an anode inlet, and a cathode. The fuel cell system further includes a hydrogen pump in communication with the anode outlet and the anode inlet. The hydrogen pump features a proton exchange membrane disposed between a first electrode and a second electrode. The first electrode is configured to accept an anode outlet stream from the anode outlet, the anode outlet stream including a hydrogen gas and an inert gas, the first electrode being configured to exhaust the inert gas. In one embodiment, the hydrogen pump is in communication with a PROX unit and configured to provide the hydrogen gas to the fuel cell stack. Further provided are methods employing the hydrogen pump wherein a start-stop degradation of the fuel cell is militated against and a hydrogen feed stream is humidified.

The invention discloses a PrOx-MnOx/SAPO-34 low-temperature SCR smoke denitration catalyst and a preparation method and application thereof .In the preparation method, an SAPO-34 molecular sieve serves as the carrier, Mn and Pr are loaded on the SAPO-34 molecular sieve through a solvent dispersion method, and then the PrOx-MnOx/SAPO-34 low-temperature SCR smoke denitration catalyst is prepared through roasting; in the PrOx-MnOx/SAPO-34 low-temperature SCR smoke denitration catalyst, the mass percentage of Mn and the SAPO-34 molecular sieve is 15-25%, and the molar ratio of Pr to Mn is 0-0.3 .The dispersity of active components is improved, the specific surface area and acidity of the catalyst are increased, and the catalyst presents excellent NH3-SCR performance at a low temperature of 200 DEG C or below and has certain SO2 poisoning resistant performance .

A fuel processing system (FPS) (110) is provided for a fuel cell power plant (115) having a fuel cell stack assembly (CSA) (56). A water gas shift (WGS) reaction section (12, 120) of the FPS (110) reduces the concentration of carbon monoxide (CO) in the supplied hydrocarbon reformate, and a preferred oxidation (PROX) section (40) further reduces the CO concentration to an acceptable level. The WGS section (12, 120) includes a reactor (124) with a high activity catalyst for reducing the reformate Co concentration to a relatively low level, e.g., 2,000 ppmv or less, thereby relatively reducing the structural volume of the FPS (110). The high activity catalyst is active at temperatures as low as 250° C., and may be a noble-metal-on-ceria catalyst of Pt and Re on a nanocrystaline, cerium oxide-based support. Then only a low temperature PROX reactor (46) is required for preferential oxidation in the FPS (110).

The invention relates to a preparation method of a CuOx/CeO2 catalyst with high CO-PROX activity and various Cu species. Copper acetate and CeO2 carrier are placed into a mortar, are ground for certain time and are calcined for 3 hours respectively at the temperature of 200-400 DEG C in the N2 atmosphere, and thus the CuOx/CeO2 catalyst with various Cu species can be prepared. The preparation method has the advantages that no solvent is needed in the preparation process, and the loss of active species and the resulting pollution of water environment can be avoided effectively. More importantly, the catalyst has high CO-PROX activity and selectivity, the base metal Cu which can be easily obtained is used as an active ingredient, and high activity comparable with the activity of noble metal can be achieved.

A catalyst for preferentially reducing carbon monoxide in a hydrogen stream. The catalyst is formed from a chemical composition including a hexaaluminate, a metal hydroxide and a precious metal. The composition may be disposed on a support or may be extruded or cast into or onto a support. Incorporation of hexaaluminates allows inclusion of metal hydroxides that flux the active precious metal surface at higher temperatures than can aluminum oxide-based catalytic compositions, thereby enhancing resistance of the catalyst and monolithic support and increasing the durability and thermal range of the PROX catalyst. An additional advantage is that lesser amounts of precious metal oxides need be deposited onto the hexaaluminate, while retaining activity similar to aluminum oxide compositions.

The invention discloses a methanol-water fuel reforming hydrogen production system. The system comprises a methanol-water fuel feeding pipe, an evaporator, a modifier, a CO oxidation removal device and a hydrogen-rich mixed gas conveying pipe which are connected in sequence. The CO oxidation removal device comprises an LTS catalytic oxidizer and a PROX catalytic oxidizer, a copper-zinc-based catalyst is arranged in the LTS catalytic oxidizer, and a ruthenium-based catalyst is arranged in the PROX catalytic oxidizer. The hydrogen-rich mixed gas is subjected to staged oxidation treatment throughthe LTS catalytic oxidizer and the PROX catalytic oxidizer, so that the CO concentration in the gas is gradually reduced to guarantee that CO is completely removed. According to the system, the conversion rate of methanol can reach 100%, CO in the reformed mixed gas can be completely removed, the starting time of the system is short, the reforming hydrogen production condition can be rapidly achieved, energy consumption is low, the hydrogen production speed is high, the hydrogen production cost is low, the energy conversion efficiency is high, environmental protection and energy conservationare achieved, and the power generation efficiency is high after the system is in butt joint with a fuel cell stack.

Provided are novel peptides of Formula SEQ ID No. 1:

J¹CysX¹X²X³X⁴X⁵X⁶ProX⁷ThrCysJ²J³(J⁴)_s(J⁵)_t;   (SEQ ID No. 1)

pharmaceutically acceptable salts thereof, and pharmaceutical compositions thereof, which are effective inhibitors of light chains to uromodulin.

A vermiculite supported catalyst for carbon monoxide (CO) preferential oxidation (PROX) is disclosed. The CO PROX catalyst comprises at least one catalytic agent, one optional modifier agent, one carrier material, and a vermiculite support. The process for preparing the vermiculite supported catalyst in this invention includes depositing first the carrier material on a vermiculite support followed by calcination to form the carrier-containing support, and wet impregnating the catalytic agent and the optional modifier agent on the carrier-containing support followed by drying and calcination to form the CO preferential oxidation catalyst.

The invention discloses a preparation method of a copper cerium catalyst with high dispersion of active species. The preparation method of the copper cerium catalyst with high dispersion of the activespecies comprises the steps that S1, metal copper salt or cerium salt is dispersed in water, further a dispersed organic ligand is added, and the mixture is stirred uniformly; and the mixed solutionis placed in an oven for crystallization, hydrothermal synthesis is carried out to obtain a copper metal organic framework compound or a cerium metal organic framework compound or a copper cerium bimetallic organic framework compound; S2, when the synthesis product is a copper metal organic framework compound, the copper metal organic framework compound is loaded with cerium ions by an equal volume impregnation method; when the synthesis product is the cerium metal organic framework compound, the cerium metal organic framework compound is loaded with copper ions by an impregnation method to obtain a catalyst precursor; S3, and the obtained catalyst precursor is dried and placed in a muffle furnace for calcination to obtain the copper cerium catalyst. The synthesized copper cerium catalysthas the following advantages that (1) a large specific surface area is achieved, so that efficient conversion of CO is facilitated; (2) orderly pores are achieved, and gas mass transfer during the reaction is accelerated; and (3) better CO-PROX effect is achieved, complete conversion of CO can be achieved at 100 DEG C with good selectivity.

A two stage-carbon monoxide preferential oxidation article and method that uses a single injection of an O₂-containing gas.