40 results about "Hydrogen flux" patented technology

In one embodiment, a membrane of proton-electron conducting ceramics that is useful for the conversion of a hydrocarbon and steam to hydrogen has a porous support of M′-Sr1-z′M″z′Ce1-x′-y′Zrx′M′″y′O3-δ, Al2O3, mullite, ZrO2, CeO2 or any mixtures thereof where: M′ is Ni, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, W, Zn, Pt, Ru, Rh, Pd, alloys thereof or mixtures thereof; M″ is Ba, Ca, Mg, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb; M′″ is Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, W, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb; z′ is 0 to about 0.5; x′ is 0 to about 0.5; y′ is 0 to about 0.5; and x′+y′>0; for example, Ni—SrCe1-x′Zrx′O3-δ, where x′ is about 0.1 to about 0.3. The porous support is coated with a film of a Perovskite-type oxide of the formula SrCe1-x-yZrxMyO3-δ where M is at least one of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, W, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb, x is 0 to about 0.15 and y is about 0.1 to about 0.3. By including the Zr and M in the oxide in place of Ce, the stability can be improved while maintaining sufficient hydrogen flux for efficient generation of hydrogen. In this manner, the conversion can be carried out by performing steam methane reforming (SMR) and / or water-gas shift reactions (WGS) at high temperature, where the conversion of CO to CO2 and H2 is driven by the removal of H2 to give high conversions. Methods of preparing the membrane cells and a system for use of the membrane cells to prepare hydrogen are presented. A method for sequestering CO2 by reaction with methane or other hydrocarbon catalyzed by the novel membrane to form a syngas is also presented.

The invention discloses a fuel cell engine system, comprising a fuel cell stack, a distribution assembly, a hydrogen supply unit, an air supply unit, a cooling unit and a heat exchanger, wherein a humidifier of the air supply unit is omitted; the hydrogen supply unit comprises a hydrogen reflux part; the hot end of the heat exchanger is air fluid while the cold end of the heat exchanger is provided with two independent fluids, namely a hydrogen fluid and a cooling cycle fluid; the hot end inlet of the heat exchanger is connected with a vent of an air compressor while the hot end outlet is connected with an air inlet of the fuel cell stack; the two fluid inlets of the cold end of the heat exchange are respectively connected with a control valve outlet of a hydrogen storage tank outlet and a cooling cycle pump outlet; the two fluid outlets of the cold end of the heat exchanger are respectively connected with the fuel cell stack hydrogen inlet and cooling cycle pump inlet. The fuel cell engine system has the beneficial effects that the air cooler and the hydrogen preheater are combined, and hydrogen flux is used for replacing the air side humidifier, thus simplifying the system, reducing the size and weight of the parts, and reducing the system energy consumption.

Hydrogen selective coatings, coated articles and methods for their formation and for hydrogen separation or purification. The coatings are formed by atomic layer deposition of suitable metal oxides with desirable hydrogen activation energy or hydrogen flux, e.g., silicon dioxide, and can be borne on a nonporous, thin-film metal or cermet substrate, e.g., a palladium sheet or layer. The coated substrate may include a porous support for the sheet or layer. The coated article may be used as a purification membrane and the coating can protect the metal layer from contaminants in the gas or process stream from which hydrogen is being purified. In some embodiments, the coated article can provide such protection at elevated temperatures in excess of 300° C.; and in other embodiments, can provide protection at temperatures in excess of 600° C. and even in excess of 800° C.

A method of measuring a hydrogen diffusivity of a metal structure is provided. The method includes providing a hydrogen charging surface at a first location on an external surface of the structure, and a hydrogen oxidation surface at a second location adjacent to the first location on the external surface of the structure. A hydrogen flux is generated and directed into the metal surface at the charging surface. At least a portion of the hydrogen flux generated by the charging surface and diverted back toward the surface is detected, and a transient of the diverted hydrogen flux is measured. The hydrogen diffusivity of the metal structure is then determined based on the measured transient.

The invention provides a production method of ultra-low hydrogen flux-cored welding wire, which sequentially includes the processes of powder filling, rolling forming, wire thinning, annealing, coating drawing, and layer winding; wherein, in the annealing process, the heating temperature is 500-600 ℃; in the annealing device, the running speed of the welding wire is less than or equal to 8m / s, the actual length of the heating section is 800-1000mm, and the heating current is less than or equal to 300A. After passing through the water cooling tank in the device, the welding wire is cooled. After cooling for 2-5 seconds, Lower to 80-150°C; the coating drawing process is carried out in the coating drawing die, which contains hydrogen-free anti-rust oil, and the temperature of the anti-rust oil is 60-80°C. The production method described in the invention has flexible and controllable technology and strong adaptability, can produce ultra-low hydrogen flux-cored welding wires of various types and specifications, and has continuous production process and high efficiency.