A method of producing synthesis gas in a dual pressure level ammonia plant having a first synthesis section operated in once through fashion at a first relatively lower high pressure and having a second synthesis section operated in recirculating fashion at a second relatively higher high pressure. In the first synthesis section downstream of an OT reactor of the first synthesis section the synthesis gas is cooled using cooling medium at a pressure below the first high pressure, wherein the cooling medium is provided at a pressure below the first high pressure level by means of a medium pressure steam generator or wherein the cooling is effected by means of the medium pressure steam generator. The disclosure further relates to a synthesis gas cooling assembly in such a dual pressure level ammonia plant and at least one plant component for providing or for utilizing the cooling medium.

A ruthenium-copper (RuCu) nano-sponge (NSP) electrocatalyst for use in the electrolytic reduction of nitrogen to provide ammonia is described. The RuCu NSP can be prepared as a porous nanoparticle comprising a RuCu alloy via facile reduction of Ru and Cu precursors under ambient conditions. Electrodes prepared with surface disposed RuCu NSPs can be used to prepare ammonia from nitrogen with good yields and Faradaic efficiency at room temperature and atmospheric pressure.

A ruthenium-copper (RuCu) nano-sponge (NSP) electrocatalyst for use in the electrolytic reduction of nitrogen to provide ammonia is described. The RuCu NSP can be prepared as a porous nanoparticle comprising a RuCu alloy via facile reduction of Ru and Cu precursors under ambient conditions. Electrodes prepared with surface disposed RuCu NSPs can be used to prepare ammonia from nitrogen with good yields and Faradaic efficiency at room temperature and atmospheric pressure.

An object of the invention is to provide a jig electrolytic stripper that can sufficiently remove palladium adhered to the current-conducting portion of a plating jig, that can remove palladium adhered to the insulating-material-coated portion of the jig, and that exhibits reduced erosion of the metal of the current-conducting portion of the jig. The jig electrolytic stripper comprises the following components (A) to (C): (A) at least one member selected from the group consisting of nitric acid and salts thereof, (B) at least one member selected from the group consisting of ammonia, ammonium salts, ethylene amine compounds, alkyl diamine compounds, and amino acids, and (C) a bromide.

An object of the invention is to provide a jig electrolytic stripper that can sufficiently remove palladium adhered to the current-conducting portion of a plating jig, that can remove palladium adhered to the insulating-material-coated portion of the jig, and that exhibits reduced erosion of the metal of the current-conducting portion of the jig. The jig electrolytic stripper comprises the following components (A) to (C): (A) at least one member selected from the group consisting of nitric acid and salts thereof, (B) at least one member selected from the group consisting of ammonia, ammonium salts, ethylene amine compounds, alkyl diamine compounds, and amino acids, and (C) a bromide.

A method for preparing urea ammonium nitrate solution from waste nitric acid after stripping tin from circuit board includes: causing the waste nitric acid after stripping tin and the ammonia water to undergo neutralizing and precipitating reaction through acid-base neutralization, filtering, thereby obtaining tin-containing filter mud and a primary filtrate; adding iron powders into to the primary filtrate to initiate copper-iron replacement reaction, filtering, thereby obtaining iron-containing coarse copper powders and a secondary filtrate; adding hydrogen peroxide to the secondary filtrate, filtering, thereby obtaining an iron-containing sludge and a tertiary filtrate; adding a heavy metal capturing agent to the tertiary filtrate, filtering, thereby obtaining a heavy metal sludge and an ammonium nitrate solution; measuring a concentration of the ammonium nitrate solution, adding urea and liquid fertilizer corrosion inhibitor to obtain a urea/ammonium nitrate dilute solution, evaporating and concentrating the urea/ammonium nitrate dilute solution, thereby obtaining the urea ammonium nitrate solution.

A combustion device burns fuel ammonia in a combustion chamber using compressed combustion air, and includes a combustion air cooling unit which is configured to cool the combustion air by heat exchange with the fuel ammonia during or before a compression process.

An ammonia solution production device produces a dilute ammonia solution by supplying ammonia from an ammonia supply device to ultrapure water supplied from an ultrapure water production device and dissolving the ammonia, and supplies the ammonia solution to a use point. Here, the ultrapure water production device has the ability to supply ultrapure water having a resistance value of 18 MΩ.Math.cm or more, and a metal ion concentration of 1 ng/L or less, particularly 0.1 ng/L or less. Ammonia is added to the ultrapure water from the ammonia supply device to produce the dilute ammonia water. The ammonia solution production device is suitable for the production of dilute ammonia water having an ammonia concentration of 100 mg/L or less. Such an ammonia solution production device is capable of producing an ammonia solution with a stable concentration, and achieves excellent follow-up performance with respect to a change in the concentration.

A mercury sorbent and method for enhancing mercury removal performance of activated carbon from flue gas by the addition of non-halogen ammonium-containing compounds are provided herein.

A mercury sorbent and method for enhancing mercury removal performance of activated carbon from flue gas by the addition of non-halogen ammonium-containing compounds are provided herein.