Hydrogen reduces copper oxide to produce red solid. What are these red solids?

Hydrogen reduces copper oxide to produce red solid. What are these red solids?

Copper oxide (CuO) contains oxygen and can react with reducing substances. Black copper oxide is reduced to bright red copper (Cu).

Reducing substances include carbon (C), carbon monoxide (CO) and hydrogen (H2), all of which can undergo redox reaction with copper oxide.

Application in food industry Because of its strong hydrophilicity, viscosity and stability, bacterial cellulose can be used as food forming agent, thickener, dispersant, anti-solvent, flavor modifier, casing and skeleton of some foods, and has become a new important food base and dietary fiber. For example, in the traditional fermentation process, fermented food rich in cellulose can be produced by pure culture of acetic acid bacteria or mixed culture of acetic acid bacteria and other microorganisms. Nata de coco is a dessert food fermented by acetic acid bacteria and rice flour sugar, and it is one of the 30 popular foods in Japan at present.