130 results about "CO poisoning" patented technology

Synthetic fuels are produced from synthesis gas in a four-stage reactor system with a single recycle loop providing the requisite thermal capacity to moderate the high heat release of the reactions and to provide the reactants and reaction environments for the efficient operation of the process. The first stage converts a portion of the synthesis gas to methanol, the second stage converts the methanol to dimethylether, the third stage converts the methanol and dimethylether to fuel and the fourth stage converts the high melting point component, durene, and other low volatility aromatic components such as tri- andtetra-methylbenzenes to high octane branched paraffins. The four-stage catalyst used for hydrotreating is resistant to CO poisoning. The reactions i produce water as a side product that is carried through to a high pressure separator after the fourth stage. The streams from the separator are a liquid fuel stream, a water stream and a gaseous stream that contains light hydrocarbon gases and the unreacted synthesis gas. The larger part of this gas stream is recycled to the inlet of the first stage and mixed with the fresh synthesis gas stream. Alternatively, the fresh synthetic gas stream is mixed with the product of the second stage. The smaller part of the gas stream from the separator is sent to hydrocarbon recovery and to fuel gas used for providing preheat of various streams. The liquid fuel is sent for blending into fuel products, such as gasoline, jet fuel, or diesel, and the water stream can be sent, for example, to the synthesis gas producing plant for steam generation.

The invention discloses a preparation method of a PdAg / TiO2 nanotube direct methanol fuel cell anode catalyst. The PdAg / TiO2 nanotube direct methanol fuel cell anode catalyst consists of a TiO2 nanotube and nano-PdAg. The method comprises the following steps of: preparing a TiO2 nanotube; and preparing a TiO2 nanotube dispersion liquid; preparing Pd / TiO2 and the like. The electric conductivity of TiO2 and the catalytic performance of TiO2 on methanol are enhanced through PdAg compounding, intermediate products such as CO and the like produced by methanol oxidation are adsorbed and transferred onto the surface of a composite catalyst and are directly oxidized into a final product, i.e., CO2 deeply, the price of PdAg is much lower than those of noble metals such as Pt, Ru and the like, and the using amount of PdAg in the catalyst is small, so that the catalytic oxidation performance of the catalyst on methanol can be enhanced greatly, the cost of the catalyst is reduced, and the CO poisoning resistance of the catalyst is enhanced.

The invention discloses a sulfur-doped carbon nanotube Pt-loaded catalyst for a direct methanol fuel cell and a preparation method of the catalyst. The preparation method comprises the following steps: (1) preparing a PEDOT functional MWCNTs composite material; (2) preparing a sulfur-doped MWCNTs composite material; and (3) obtaining the sulfur-doped MWCNTs Pt-loaded catalyst. The preparation method is simple in process and mild and controllable in operating condition, and deposited Pt nano particles are small in size and high in electrochemical activity superficial area and are uniformly dispersed on the sulfur-doped MWCNTs. The catalyst prepared by the method disclosed by the invention represents the characteristics of good electrochemical activity, high stability and strong anti-CO poisoning capacity on methanol oxidation.

A fuel cell system having a fuel cell stack (9) employing a phosphoric acid or other electrolyte, includes a non-reactive zone (11) in each of a group of fuel cells between corresponding coolant plates (55), the coolant entering the coolant plates in an area adjacent to the non-reactive zones (29-31). Each fuel cell has three-pass fuel flow fields, the first pass substantially adjacent to a third zone (13), remote from the first zone, the second pass substantially adjacent to a second zone contiguous with the first zone, the coolant flowing (33, 34) from a coolant inlet (29) through the first zone, to the far side of the second zone, and (37-41) from the near side of the second zone to the third zone and thence (45-50) to a coolant exit manifold (30), which assures temperatures above 150° C. (300° F.), to mitigate CO poisoning of the anode within the reactive zones, and assuring temperatures below 140° C. (280° F.) to promote sufficient condensation of evaporated electrolyte in the non-reactive zones, so as to provide a long system life.

The invention relates to a method for preparing direct methanol fuel cell Pt-Ru / C catalyst, which is characterized by comprising the following steps: (1) adding a carbon carrier into surface active agent and carrying out ultrasonic oscillation to obtain dispersed slurry; (2) adding an aqueous solution of a Pt compound and an Ru compound and carrying out the ultrasonic oscillation to obtained dispersed slurry; (3) dropwise adding a reducing agent for reducing; (4) completely reacting and then filtering, washing and drying to obtain the finished Pt-Ru / C catalyst of which Pt and Ru are electrically deposited on the carbon carrier. The invention has the following technical advantages that: (1) simple step, mild operation condition and easy mass production are achieved; and (2) the Pt-Ru / C catalyst prepared by the method can be used as a positive electrode catalyst and has high electro-catalysis oxidative activity of the methanol and lower carrying capacity which is only 1-2mg / cm<2> lower than common 2-4 mg / cm<2> and higher CO poisoning resistance.

The invention discloses a preparation method for optimizing performance of porous dendritic Pt-Ru-Ni alloy nanoparticles. Platinum acetylacetone, ruthenium acetylacetone and nickel acetylacetone are used as metal precursors, oleyamine is used as a solvent, oleyamine and oleic acid are used as surfactants, oleyamine and formaldehyde are used as reducing agents, and the porous dendritic Pt-Ru-Ni alloy nanoparticles with higher selectivity are synthesized through assistance of an oven. The method is easy to operate and has high repeatability and enriches the design idea of the Pt-based alloy nanoparticle catalyst. The obtained porous dendritic Pt-Ru-Ni alloy nanoparticles have high specific surface area and large pore capacity, improve and increase active sites and can fully utilize the active sites, show excellent durability and CO poisoning resistance and have wide application prospect.