摘要:
The invention regards a method for electrochemical ammonia synthesis, comprising the steps of: - providing an electrolysis cell having a cathode, - contacting the cathode with a source of cations, preferably lithium cations, a source of nitrogen, a source of oxygen, and a source of protons, wherein the oxygen source provides a predefined oxygen concentration, and - subjecting the cell to a potential and current load, whereby ammonia is synthesized.
摘要:
The invention contributes to a cost effective way to solve the problem of trace ammonia removal from a hydrogen and nitrogen containing gas. The set of catalysts of the invention selectively oxidised ammonia in ppm concentration even in gas mixtures containing hydrogen gas in concentrations of three orders of magnitude higher than the concentration of ammonia.
摘要:
The invention relates to the direct conversion of solar energy to chemical fuels, e.g. hydrogen, utilizing a combination of a visible and/or infrared light absorber with a non-platinum (Pt) hydrogen evolution reaction (HER) catalyst deposited on its surface. The invention discloses a hydrogen evolution reaction (HER) material comprising a molecular cluster core of the formula L x N y M z , where L is selected from molybdenum (Mo), tungsten (W), tantalum (Ta), rhenium (Re), iron (Fe), nickel (Ni), niobium (Nb), chromium (Cr) and cobalt (Co); N is selected from oxygen (O), nitrogen (N), sulphur (S), selenium (Se) and tellurium (Te); M is selected from copper (Cu), cobalt (Co), manganese (Mn), or any other transition metal; x is an integer selected from 2, 3, 4 and 5; y is an integer selected from 1, 2, 3, 4 and 5; z is an integer selected from 0, 1, 2, 3, 4 and 5. The invention further discloses a system comprising said HER material and a photoabsorptive positive type (p-type) semiconductor with a low band gap, where said HER material is positioned on the surface of said photoabsorptive semiconductor, thereby enhancing the hydrogen production.
摘要:
The invention regards a method for electrochemical ammonia synthesis, comprising the steps of: providing at least one electrolysis cell; contacting the cathode with a source of lithium cations, nitrogen, and protons; and subjecting the cathode to a continuous pulsed cathode potential, including a pulsed cathodic current load, wherein the cathode potential is pulsed between the lithium reduction potential and a less negative cathode potential, whereby ammonia is synthesized.
摘要:
The present invention concerns a chemical process for preparing nanoparticles of an alloy comprising both a noble metal, such as platinum, and a non-noble transition or lanthanide metal, such as yttrium, gadolinium or terbium. The process is carried out by reduction with hydrogen and removal of volatile species in gas form at the reaction temperature.
摘要:
The present invention concerns electrode catalysts used in fuel cells, such as proton exchange membrane (PEM) fuel cells. The invention is related to the reduction of the noble metal content and the improvement of the catalytic efficiency by low level substitution of the noble metal to provide new and innovative catalyst compositions in fuel cell electrodes. The novel electrode catalysts of the invention comprise a noble metal selected from Pt and Pd alloyed with an alkaline earth metal.
摘要:
The present invention concerns electrode catalysts used in fuel cells, such as proton exchange membrane (PEM) fuel cells. The invention is related to the reduction of the noble metal content and the improvement of the catalytic5 efficiency by low level substitution of the noble metal to provide new and innovative catalyst compositions in fuel cell electrodes. The novel electrode catalysts of the invention comprise a noble metal selected from Pt and Pd alloyed with a lanthanide metal.
摘要:
The invention relates to a device (10) for extracting volatile species from a liquid (20) connected to an inlet of an analysis instrument, such as a mass spectrometer (MS). The device has a chamber (4), a membrane (5) forming a barrier for the liquid at zero differential pressure between the inside and the outside of the chamber, and allowing passage of the volatile species at zero differential pressure between the inside and the outside of the chamber. The device has an inlet capillary channel (3) to feed in a carrier gas and prevent back-diffusion from the chamber, and an outlet capillary channel (6) which provides a significant pressure reduction, e.g. from atmospheric pressure in the chamber (4) to near-vacuum suitable for an MS. The invention combines the best of two worlds, i.e. the fast time-response of a DEMS system and the high sensitivity of a MIMS system, since a differential pumping stage is not needed.
摘要:
The invention relates to a vibrating sample magnetometer (VSM) for measuring magnetic properties of a sample (S) using an elongated sample holder (SH, 10) with a controlled gas-atmosphere. The sample holder has an inlet (13) for receiving a first gas at the proximal end, an elongated first fluid channel (11) for conveying the first gas from the inlet to the sample. An elongated second fluid channel (12) conveys the first gas away from the sample, and an outlet (14) is arranged for conveying the first gas away from the elongated second fluid channel. Both the inlet and outlet are arranged at the proximal end of the sample holder near the head drive, and the sample holder facilitates vibrating sample magnetometry measurements of samples in gas-controlled environments at temperatures up to at least 1000 degrees C and in situ measurements of small sample masses.
摘要:
The present invention relates to a bimetallic catalyst for ammonia oxidation, a method for producing a bimetallic catalyst for ammonia oxidation and a method for tuning the catalytic activity of a transition metal. By depositing an overlayer of less catalytic active metal onto a more catalytic active metal, the total catalytic activity is enhanced.