The copper catalyst refers to a general term for elemental copper, copper oxide and copper salt having catalytic properties. Copper is a magenta metal in the fourth cycle and the IB group of the periodic table. Copper is a less active metal that does not combine with oxygen in dry air at room temperature and produces black copper oxide when heated. The common valence states of copper are 0, +1 and +2. Copper is one of the metals used by humans in the early days. It has many excellent properties, such as good electrical and thermal conductivity, good ductility, low cost and wide range of raw materials. Nano-scale copper has more excellent properties than traditional bulk copper materials, such as large specific surface area, strong plasticity, high strength, and low electrical resistance. Copper and its compounds have excellent activity in the catalytic oxidation, hydrogenation and dehydrogenation of organic compounds, so they are widely used in catalyst preparation. For different catalytic reactions, copper-based catalysts have different requirements for the form of the active copper valence state.
Figure 1. Copper elemental catalyzed ethanol oxidation
Copper catalysts are widely used in organic catalytic reactions due to their good catalytic performance, low cost and low toxicity.
Figure 2. Copper salt catalys catalyzes C-H activation