Abstract:
A fixed oxide reactor provided with an electrode structure comprising a first electro de, a second electrode (6; 26), a first gas chamber (V1), a second gas chamber and an ion - conductive medium (8), wherein an ion - conductive medium is located between the first electrode (2) and the second electrode, wherein furthermore, the first electrode borders on the first gas chamber, and the second electrode borders on the second gas chamber. The first electrode comprises a first layer of a conductive oxide material, the conductive oxide material being composed of at least one electron - conducting oxide material provided with a defective structure and one ion - conductive oxide material provided with a defective structure. The second electrode comprises a first layer of a conductive oxide material, the conductive oxide material being composed of at least one electron - conductive oxide material provided with a defective structure and one ion - conductive oxide material provided with a defective structure.
Abstract:
Method and device for the detection of Co in a hydrogen-rich gas stream. Such a gas stream is, for example, fed to a fuel cell. Detection takes place with the aid of a miniature electrochemical cell and is based on the principle that carbon monoxide that moves past the anode screens the anode material, as a result of which the reaction with hydrogen at the anode is impeded. By determining the decrease in the current density it is possible to determine the degree of screening as a function of time and thus the percentage CO. According to the invention the gas is fed past the anode only and the cathode is in direct contact with a water bath.
Abstract:
Cellulose from lignocellulosic biomass which also contains protein, such as grasses and straws, can be enzymatically converted to valuable products such as glucose at lower enzyme consumption by: (a) extracting the biomass with water at 15-75 °C to produce an extracted biomass and a protein-containing aqueous extract; (b) mechanically, chemically and/or thermally pretreating cellulose-containing-biomass, in particular by organosolv treatment; and (c) contacting biomass pretreated in step (b) with: (i) an enzyme capable of hydrolysing cellulose; and (ii) the protein-containing aqueous extract obtained in step (a).
Abstract:
Method and assembly for determining the presence of soot particles in a gas stream such as in the air. To prevent the disturbing effect of salts and the like that may be deposited on soot particles, it is proposed to introduce the soot particles into water as a suspension. The salts concerned dissolve in the water and have no effect when determining the change in optical properties resulting from the presence of the soot particles. This determination comprises in particular a light transmittance measurement The presence of the soot particles can be determined after the gas stream is first passed through a filter, as a result of which a particle size distribution can be determined. Suspension of the soot particles can be achieved by subjecting these to a stream of steam, whereby the steam condenses on the soot particles and then causes these to precipitate out of the gas. The various processes can be expedited by using a cyclone.
Abstract:
Method for filling with liquid a semi-manufactured product for a liquid-containing photovoltaic element, which semi-manufactured product comprises at least one plate-like work electrode and a plate-like counter-electrode adhered thereto by means of a vapour and liquid-tight peripheral edge, wherein between the work electrode, the counter-electrode and the peripheral edge a space is provided for receiving a liquid, comprising the steps of (i) providing said semi-manufactured product, (ii) arranging a filling opening as desired in the work electrode or the counter-electrode, (iii) placing the semi-manufactured product with the filling opening directed upward on a horizontally placed rotatable disc in a manner such that the filling opening extends round the rotation axis of the disc within a circle of a predetermined radius R, (iv) placing around the filling opening on the semi-manufactured product a holder with a flat underside and provided with an opening, wherein the opening has at least an internal diameter 2R and the outer diameter of the holder on its underside is smaller than the smallest surface area dimension of the semi-manufactured product, (v) introducing liquid into the holder and causing rotation of the disc with the semi-manufactured product and the holder placed thereon at a rotation speed and for a period such that the space in the semi-manufactured product is completely filled with liquid under the influence of centrifugal forces and the gravitational force acting on the liquid, and (vi) sealing the filling opening, and apparatus for performing this method.
Abstract:
A process is described for the production of electrodes for, for example, fuel cells by applying an ink consisting of a mixture of at least a carbon powder, an ion-conducting polymer and a fluid, the fluid containing at least 3 % of an alkanediol, and a fuel cell electrode which can be obtained by applying such an electrode ink to a substrate, followed by a heat treatment. The fuel cell electrode is very suitable for use in solid polymer fuel cells.
Abstract:
The invention relates to a new catalyst for the gas phase Guerbet reaction, in particular for the Guerbet reaction of ethanol, wherein the catalyst comprises at least 20 atom% copper, based on total metal content, and wherein the catalyst preferably exhibits acidic character. This catalyst for the Guerbet reaction is unprecedented in the art, in view of its acidic character, and is surprisingly effective in catalysing all steps of the Guerbet reaction, without the need for additional catalysts, such as bases, and with reduced degradation by-products such as CO and CO2.
Abstract:
The invention provides a catalyst for the production of hydrogen by steam reforming. The catalyst is a porous catalyst which is based on at least aluminium oxide and preferably magnesium oxide, and further comprises boron and nickel. The porous catalyst comprises pores having an average pore size in the range of 0.1-50 nm. The activity of the catalyst may be further enhanced by addition of a noble metal such as Rh, Ru, Pd, Ir or Pt. The catalyst can be broadly used in hydrogen production processes, and is especially suitable for reforming using a membrane which is selective for a predetermined reaction product. Such process can be operated at relatively low temperatures of about 450-700 ºC.
Abstract:
A method for wind gust detection and classification in a wind turbine. The wind turbine includes a tower and a rotor provided with a number of rotor blades on a rotor axis. The rotor is arranged on the tower. The method includes a) collecting data of a mechanical loading condition of the wind turbine, the data being associated with at least two loads exerted on the construction of the wind turbine; b) converting the data to the associated loads e in a non-rotating reference frame; c) monitoring temporal evolutions of the loads, comprising: c1) determining steady state components of the loads; c2) obtaining residuals of the loads by removing the respective steady state component from the loads; d) detecting by a test condition if the temporal evolutions of the residuals indicate that a wind gust is evolving; e) classifying the wind gust in one of a plurality of predetermined wind gust classes based on predetermined characteristics for the temporal evolutions of the residuals of the loads; f) based on the result of the classification, generating signals for adjusting the operation of the wind turbine.
Abstract:
Thermo acoustic device comprising a heat exchanger for transferring thermal energy between a first fluid in a first fluid circuit and a second fluid in a second fluid circuit. The first fluid circuit and the second fluid circuit are connected to each other in a thermally conductive manner. The first and second fluid circuits are formed by a stack of plate elements (11, 12, 13) which form first channels (6a, 6b) for the first fluid circuit and a plurality of channels (3) for the second fluid circuit. The sum total of cross sections of the plurality of channels (3) takes up at least 25% of a front surface of the second fluid circuit.