An electrode, having a catalytic coating containing ruthenium and at least one other element selected from the group of alkaline earth metals, suitable to be used in industrial electrochemical processes for hydrogen evolution and to a method for the production of the same. The catalytic coating has 93-99 wt-% of ruthenium and 1-7 wt-% of alkaline earth metals, referred to the metals.

A method of operating a solid oxide electrolyzer system includes providing a water inlet stream to at least one solid oxide electrolyzer cell (SOEC), generating a wet hydrogen product stream from the at least one SOEC, providing the wet hydrogen product stream to at least one hydrogen pump, generating a compressed hydrogen product and an unpumped effluent in the at least one hydrogen pump, and recycling at least a portion of the unpumped effluent upstream of the at least one hydrogen pump.

A method for operating a wastewater treatment system is disclosed wherein the wastewater treatment system comprises at least one electrochemical cell comprising dimensionally stable electrodes having the same catalyst composition, the electrodes being immersed in wastewater and being connected to a power supply and wherein the voltage at the power supply is monitored and the polarity of the electrochemical cell(s) is reversed when the recorded voltage increases by a predetermined voltage difference. The wastewater treatment system can comprise at least one electrochemical cell which is kept inactive while the active electrochemical cells are operating. The inactive cell(s) can be activated when all the electrodes of the active cells are consumed as indicated by another increase in voltage at the power supply after the polarity of the active cells has been once reversed.

A method for operating a wastewater treatment system is disclosed wherein the wastewater treatment system comprises at least one electrochemical cell comprising dimensionally stable electrodes having the same catalyst composition, the electrodes being immersed in wastewater and being connected to a power supply and wherein the voltage at the power supply is monitored and the polarity of the electrochemical cell(s) is reversed when the recorded voltage increases by a predetermined voltage difference. The wastewater treatment system can comprise at least one electrochemical cell which is kept inactive while the active electrochemical cells are operating. The inactive cell(s) can be activated when all the electrodes of the active cells are consumed as indicated by another increase in voltage at the power supply after the polarity of the active cells has been once reversed.

A device for producing hydrogen by water electrolysis, which includes a protective shell and an electrolytic bath provided in the protective shell, and a power supply cable and a pipeline are provided on the electrolytic bath, and both the power supply cable and the pipeline are coupled to the outside of the protective shell. In the device for producing hydrogen by water electrolysis provided by the present application, a protective shell is provided outside the electrolytic bath to avoid the exposed design of the electrolytic bath, that is, the device for producing hydrogen by water electrolysis can thus be installed indoors or outdoors, thereby improving the versatility of the device for producing hydrogen by water electrolysis.

The present disclosure relates to a method for treating an electromembrane process aqueous composition comprising sodium and/or potassium sulfate, said process comprising removing water from said electromembrane process aqueous composition under conditions suitable for substantially selectively precipitating sodium and/or potassium sulfate monohydrate.

The present disclosure relates to a method for treating an electromembrane process aqueous composition comprising sodium and/or potassium sulfate, said process comprising removing water from said electromembrane process aqueous composition under conditions suitable for substantially selectively precipitating sodium and/or potassium sulfate monohydrate.

The present invention relates to a technique for treating a raw material, such as combustible waste, and more particularly to combustion, and pyrolysis and gasification treatment techniques that does not emit carbon dioxide into the atmosphere. A treatment apparatus includes a fluidized-bed furnace having a pyrolysis chamber and a combustion chamber therein, the pyrolysis chamber and the combustion chamber are separated by a partition wall, an electrolysis device configured to electrolyze water to generate hydrogen and oxygen, a methanation reactor configured to produce methane from carbon dioxide discharged from the combustion chamber and the hydrogen, a first fluidizing-gas supply line configured to supply a first fluidizing gas to the pyrolysis chamber, and a second fluidizing-gas supply line configured to introduce a second fluidizing gas to the combustion chamber, the second fluidizing gas including the oxygen and a part of the carbon dioxide.

The present invention relates to a technique for treating a raw material, such as combustible waste, and more particularly to combustion, and pyrolysis and gasification treatment techniques that does not emit carbon dioxide into the atmosphere. A treatment apparatus includes a fluidized-bed furnace having a pyrolysis chamber and a combustion chamber therein, the pyrolysis chamber and the combustion chamber are separated by a partition wall, an electrolysis device configured to electrolyze water to generate hydrogen and oxygen, a methanation reactor configured to produce methane from carbon dioxide discharged from the combustion chamber and the hydrogen, a first fluidizing-gas supply line configured to supply a first fluidizing gas to the pyrolysis chamber, and a second fluidizing-gas supply line configured to introduce a second fluidizing gas to the combustion chamber, the second fluidizing gas including the oxygen and a part of the carbon dioxide.

An electrolysis apparatus for the electrolytic production of oxygen from oxide-containing starting material includes at least one cathode which at least partly delimits a receiving region which in at least one operation state is configured for receiving the oxide-containing starting material and at least one anode, wherein the electrolysis apparatus has at least one selective oxygen pump which is at least partly realized integrally with the anode.