48results about How to "Good gas diffusion" patented technology

To improve a CO conversion in stoichiometry-lean atmosphere, and additionally to prevent the rise of pressure loss.A catalytic coating layer 2 is constituted of a lower layer 20 including an oxygen storage capacity material and an upper layer 21 being formed on a surface of the lower layer 20 and including a catalytic noble metal, and a thickness of the upper layer is adapted so as to be 5 μm-40 μm. The upper layer 21 is good in terms of gas diffusibility, and thereby OSC resulting from the oxygen storage capacity material being included in the lower layer 20 is demonstrated maximally.

To reduce an OSC material, while maintaining necessary OSC capacity; and to improve heat resistance and reactivity of a precious metal. Proposed is an exhaust gas purifying catalyst which comprises a first catalyst layer that is formed on the surface of a substrate that is formed of a ceramic or a metal, and a second catalyst layer that is formed on the upper side of the first catalyst layer. The first catalyst layer comprises a precious metal, an OSC material and an alumina, and the OSC material and the alumina are comprised at a mass ratio of OSC material:alumina=1:7 to 1:3. The second catalyst layer comprises a precious metal, an OSC material and an alumina, and the OSC material and the alumina are comprised at a mass ratio of OSC material:alumina=1:1 to 10:0.

A honeycomb structure includes a honeycomb structure body including porous partition walls defining a plurality of cells serving as fluid passages extending from an inflow end face to an outflow end face. The partition walls have a porosity of 45 to 65%; the open frontal area of the pores having an equivalent circle diameter of 10 μm or more, of the pores open on the surface of each partition wall, is 20 to 50%; the pore density of the pores having an equivalent circle diameter of 10 μm or more is 200 to 1,000 pores / mm2; the median opening diameter of the pores having an equivalent circle diameter of 10 μm or more is 40 to 60 μm; the circularity of the pores having an equivalent circle diameter of 10 μm or more is 1.8 to 4.0; and the partition walls have a wet area of 16,500 μm2 or more.

Provide is a catalytic converter including a substrate which includes regions having different cell densities, in which exhaust gas purification performance is superior in all the regions of the substrate.A catalytic converter 10 includes catalyst layers in which a noble metal catalyst is supported on a support in surfaces of cell walls 2 of a substrate 1 having a cell structure in a longitudinal direction of the substrate 1 in which gas flows, in which the substrate 1 has a first region 1A having a relatively high cell density and a second region 1B having a relatively low cell density, and a ratio of a thickness of a catalyst layer 3A in the second region 1B to a thickness of a catalyst layer 3 in the first region 1A is in a range of more than 0.95 times and 1.2 times or less.

Disclosed is a fuel cell including a support (60, 65) which is made of a metal porous base material and disposed between a membrane electrode assembly (30) and at least either of first ribs (50) and second ribs (55). Contact surfaces (52) of the first ribs (50) and contact surfaces (57) of the second ribs (55) with the support (60, 65) are offset from each other in a cross sectional view in the direction orthogonal to a gas passage direction.

One purpose of this invention is to provide a porous electrode substrate that has a low manufacturing cost, has sufficient conductivity and gas diffusion characteristics, and shows favorable power generation ability with minor structural changes in the porous electrode substrate, as well as a method for manufacturing such a porous electrode substrate. An additional purpose of this invention is to provide a membrane-electrode joint and a solid polymer fuel cell that comprise such a porous electrode substrate. This invention is: a method for manufacturing a porous electrode substrate that comprises a step (1) in which a dispersion fluid comprising a carbon powder (C) and a fluorine-based resin is applied to one or both surfaces of a precursor sheet wherein carbon short fibers (A1) are dispersed in planar orientations with the fiber orientations being substantially within the same plane, and as a result the fluorine-based resin that contains the carbon powder (C) in the vicinity of the surface layer of one side or both sides of the precursor sheet is distributed unevenly to form a precursor sheet with unevenly-distributed fluorine-based resin, and a step (2) in which after the aforementioned step (1) the precursor sheet with unevenly-distributed fluorine-based resin is heat-treated at a temperature 150 DEG C or higher and less than 400 DEG C; a porous electrode substrate manufactured using this manufacturing method; and a solid polymer fuel cell that uses this porous electrode substrate.

The present invention provides an oxygen-reduction gas diffusion cathode having: a porous conductive substrate; diamond particle having a hydrophobic surface; and catalyst particle, the diamond particle and the catalyst particle being disposed on the porous conductive substrate, and a method of sodium chloride electrolysis using the cathode.

A fuel cell electrolyte according to one aspect of the invention contains a basic polymer and a phosphate compound expressed by the following general formula (1):where R represents an alkyl or alkoxyalkyl group, and n is 1 or 2.

An exhaust gas purifying catalyst is constituted by: noble metal particles (1); first compounds (2) which support the noble metal particles (1); second compounds (3) different in type from the first compounds (2); and oxides (4) which surround the noble metal particles (1), the first compounds (2) and the second compounds (3). A median diameter of the first compounds (2) and a median diameter of the second compounds (3) satisfy a relationship of a following inequality:median diameter of first compounds<median diameter of second compounds.

A catalyst for exhaust gas purification is described which includes a substrate and a catalyst coating layer provided on the substrate. The catalyst coating layer includes first and second metal oxide particles. The first metal oxide particles have a catalyst metal supported thereon, and the second metal oxide particles do not have a catalyst metal supported thereon. The first and second metal oxide particles have a specific particle size. This is because, when the sizes of the particles supporting the catalyst metal remain relatively large but the sizes of the particles not supporting a catalyst metal are minimized, it is possible to decrease the thickness of the catalyst coating layer while maintaining durability and improving gas diffusibility of the coating layer. Therefore, a thickness of the catalyst coating is decreased without decreasing durability, and the catalyst can exhibit high exhaust gas purification performance even under high load conditions.