Expected to fully or partially replace existing precious metal catalysts such as Pd and Pt nanogold in the fields of fine chemical synthesis and environmental governance

High activity loaded nano gold catalystThe preparation of nano gold mainly considers two aspects: one is the preparation of nano gold, ensuring high catalytic activity with small size, and the other is the selection of carrier. The carrier itself should have a relatively large specific surface area and good wettability, and have strong interaction with the loaded nano gold particles, so that the nano gold particles can be highly dispersed on the surface of the carrier.

The influence of the carrier on the catalytic activity of nano gold catalysts is mainly manifested in the specific surface area, wettability, and degree of interaction between the carrier and nano gold particles. A carrier with a large specific surface area is a prerequisite for highly dispersed gold particles. The wettability of the carrier determines whether the gold catalyst aggregates into large gold particles during the calcination process, thereby reducing its catalytic activity. In addition, the strength of the interaction between the carrier and the nano gold particles is also a key factor affecting the catalytic activity. The stronger the interaction force between the gold particles and the carrier, the higher the catalytic activity of the gold catalyst.

At present, the majority of highly active nano gold catalysts are supported, and the presence of a carrier not only benefits the stability of active gold species, but also plays an important role in promoting the activity of the entire catalyst due to the previous interaction between the carrier and gold nanoparticles.

A large number of research results show that nano gold has the ability to catalyze various chemical reactions and is expected to fully or partially replace existing precious metal catalysts such as Pd and Pt in the fields of fine chemical synthesis and environmental governance, demonstrating broad application prospects

1. Choose oxidation reaction

Selective oxidation of alcohols and aldehydes, epoxidation of olefins, selective oxidation of hydrocarbons, and synthesis of H2O2.

2. Hydrogenation reaction

Hydrogenation of olefins; Selective hydrogenation of unsaturated aldehydes and ketones; The selective hydrogenation of nitrobenzene compounds shows that the Au/SiO2 catalyst with a 1% loading of nano gold can achieve efficient catalytic hydrogenation synthesis of high-purity halogenated aromatic amines, providing a new possibility for solving the problem of catalytic hydrogenation to remove halogens in current industrial processes.

Nano gold catalysts are widely used in biosensors as efficient catalysts with good chemical stability. They are the most stable among Group VIII elements, but gold nanoparticles exhibit excellent catalytic activity due to their small size effect. Nonlinear optics, and so on.

In catalyzing similar reactions, nano gold catalysts have lower reaction temperatures and higher selectivity than general metal catalysts. Their low-temperature catalytic activity is high. For example, Au/TiO2 catalysts with a loading of 10% nano gold have much higher catalytic activity at a reaction temperature of 200 ℃ than commercial CUO-ZNO-AL2O3 catalysts.

1. CO oxidation reaction

2. Low temperature water gas shift reaction

3. Liquid phase hydrogenation reaction

4. Liquid phase oxidation reactions, including ethylene glycol oxidation to produce oxalic acid and selective oxidation of glucose.