Hydrogenation catalysts used in chemicals

With the improvement of China's science and technology development level, more and more technologies have started to emerge in front of people. In the fine chemical industry, catalytic hydrogenation technology is extremely effective and is widely used in China's chemical industry, which mainly uses loaded catalysts. 

The activity of this type of catalyst is relatively high, which will have different degrees of influence on some metal loading, therefore, the catalyst is usually limited and restricted by various external conditions in actual use. The catalytic hydrogenation technology in fine chemical industry is discussed in detail to explore the key points of its application so that the technology can show its maximum utility in fine chemical industry.

Hydrogenation catalysts are an important part of the reduction reaction, and at this stage, Pd/Pct/nickel skeletons are the main catalysts used in the research work carried out in China.

1.1 Nickel-based catalysts

There are two main types of nickel-based catalysts, namely diatomaceous earth and silica. The chemical personnel choose the precipitation method to precipitate the nickel nitrate and place it on the carrier. In the actual use process, the catalyst should be catalyzed by hydrogen to ensure that the catalyst does not produce undesirable self-burning reactions when it is around 400°C and does not float up and down more than 50°C. 

Nickel skeleton is a kind of material that will be treated by strong alkali corrosion, and it will be presented in a porous sponge state, so in the actual preparation process, it should add some more stable amount of elements in titanium, which will improve the performance of its various alloys, and in the actual catalyst application process, both the acidity and corrosion will affect its catalyst performance to some extent. Nickel-based catalysts are extremely economical, so they are easier to use in practice and have more scope for application.

1.2 Palladium catalyst

Palladium-based catalysts are made in a simple way by first dissolving palladium chloride to dissolve the substance into the hydrochloric acid solution, and then adding a certain amount of activated carbon to allow the palladium to fully function, and after dipping, drying the activated carbon to reduce the hydrogen and control the temperature at which the reduction reaction occurs. This method of preparation is used in most catalysts, and the frequency of migration of the active material composition should be controlled.

1.3 Platinum-based catalysts

Platinum catalysts are prepared by placing chloroplatinic acid in water, adding an excess of sodium nitrate to the water, drying it, and adjusting the drying temperature to 35°C so that it can quickly melt and decompose to produce nitrogen dioxide gas with brown precipitated material, and then adjusting the temperature again after the chemical reaction to let it After the chemical reaction, the temperature is adjusted again to 500°C, and the decomposition is followed by the production of platinum dioxide hydrogenation catalyst.

1.4 Activated carbon/carrier material

Activated carbon/carrier material has a very high catalytic capacity, so it requires a high performance of activated carbon itself, which cannot be mixed with other mechanical impurities.

1.5 Copper catalyst

If the catalyst is used alone, it is easy to produce sintering. Once sintering is produced, it will bring problems to the preparation process and the carrier is needed to avoid such problems.