Low temperature activity, excellent selectivity, and environmentally friendly nano gold catalyst

Regarding the catalytic properties of gold, its first ionization ability is high and it is difficult to lose electrons, so the interaction force between gold and surface molecules is usually weak. At temperatures below 200 ℃, even highly reactive molecules such as hydrogen and oxygen are not easily adsorbed on the surface of single crystal gold. Due to the adsorption of molecules on the catalyst surface being a prerequisite for catalytic reactions, it can be considered that elemental gold does not have good activity for hydrogenation and oxidation reactions. Gold does not have good catalytic activity. In fact, the prerequisite for gold catalysts to have catalytic activity is to be preparedHighly dispersed nanoscale gold particles.

The characteristics of nano gold catalysts include low temperature activity, good selectivity, and environmental friendliness.

One obvious characteristic of nano gold particles as catalysts is their low-temperature activity.

Nano gold catalystWhen catalyzing certain reactions, it can be carried out at room temperature or even below 0 ℃, and has good catalytic activity, such as catalyzing CO oxidation and O3 decomposition, which can be carried out at room temperature. In fact, the activity of gold catalysts for most reactions occurs below 230 ℃. The activity of gold catalysts is significantly lower than other precious metal catalysts above 230 ℃.

2. Nano gold particle catalysts have good selectivity in catalyzing certain reactions, and their catalytic performance is usually different from other precious metal catalysts.

For example, in the CO2 hydrogenation reaction catalyzed by Au/ZnO catalyst, although its activity in generating methanol is slightly lower than that of commercial Cu/ZnO-Al2O3 catalyst, its selectivity is higher.

3. Nano gold particle catalysts are environmentally friendly. Nano gold catalysts can purify some pollutants in the environment under normal temperature and humidity conditions without consuming too much heat energy.

In terms of hydrogen energy generation, this catalyst can provide some new green synthesis methods and treatment processes.