2 results about "Cupric hydroxide" patented technology

The utility model relates to a production device of stable-state copper hydroxide, and belongs to the technical field of production of copper hydroxide. Comprising a reaction tank, a connecting pipe and a drying box, the drying box is fixedly connected with the reaction tank through a plurality of supporting columns, the connecting pipe is communicated between the drying box and the reaction tank, and a switch valve is arranged in the connecting pipe; warm air blowers are arranged on the two sides of the upper end in the drying box, a supporting frame is arranged at the lower end of the drying box, a bearing piece is slidably connected to the upper end of the supporting frame, and a vibration mechanism is arranged in the supporting frame. According to the copper hydroxide drying device, the drying box communicated with the reaction tank is arranged, stable-state copper hydroxide on the bearing piece is vibrated through the vibration mechanism in the drying process, the drying effect is optimized, the copper hydroxide is dried more evenly and fully, and the situation that the copper hydroxide below is difficult to dry is avoided.

This invention discloses a method for preparing a cobalt tetroxide / copper oxide-cuprous oxide composite catalyst for electro-reduction of nitrate to ammonia, comprising the following steps: (1) adding sodium hydroxide and ammonium persulfate to water to obtain solution A; (2) immersing pretreated copper foam in solution A to obtain copper foam with copper hydroxide on its surface; removing the copper foam from solution A, washing and drying it; (3) adding cobalt salt and urea to water to obtain solution B; (4) placing the copper foam with copper hydroxide on its surface from step (2) into solution B and performing a hydrothermal reaction at high temperature; washing and drying the solid after the reaction; (5) calcining the dried product at 320~360℃ for 1.5~2h to obtain the cobalt tetroxide / copper oxide-cuprous oxide composite catalyst. The composite catalyst prepared by the method of this invention has good catalytic activity and can achieve excellent ammonia Faradaic efficiency and high ammonia yield when electrocatalyzing nitrate reduction reaction under a specific window voltage.