1 results about "Cupric hydroxide" patented technology

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.